Rename Quat to Quaternion

21 files changed, 264 insertions, 265 deletions

diff --git a/core/core_constants.cpp b/core/core_constants.cpp
index 30c2ed80ac..7fc09fc3a6 100644
--- a/core/core_constants.cpp
+++ b/core/core_constants.cpp
@@ -580,7 +580,7 @@ void register_global_constants() {
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_VECTOR3I", Variant::VECTOR3I);
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_TRANSFORM2D", Variant::TRANSFORM2D);
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_PLANE", Variant::PLANE);
-	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_QUAT", Variant::QUAT);
+	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_QUATERNION", Variant::QUATERNION);
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_AABB", Variant::AABB);
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_BASIS", Variant::BASIS);
 	BIND_CORE_ENUM_CONSTANT_CUSTOM("TYPE_TRANSFORM3D", Variant::TRANSFORM3D);
diff --git a/core/io/marshalls.cpp b/core/io/marshalls.cpp
index de32ffbcdc..b1988d6f2a 100644
--- a/core/io/marshalls.cpp
+++ b/core/io/marshalls.cpp
@@ -279,9 +279,9 @@ Error decode_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int
 			}
 
 		} break;
-		case Variant::QUAT: {
+		case Variant::QUATERNION: {
 			ERR_FAIL_COND_V(len < 4 * 4, ERR_INVALID_DATA);
-			Quat val;
+			Quaternion val;
 			val.x = decode_float(&buf[0]);
 			val.y = decode_float(&buf[4]);
 			val.z = decode_float(&buf[8]);
@@ -1099,9 +1099,9 @@ Error encode_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len, bo
 			r_len += 4 * 4;
 
 		} break;
-		case Variant::QUAT: {
+		case Variant::QUATERNION: {
 			if (buf) {
-				Quat q = p_variant;
+				Quaternion q = p_variant;
 				encode_float(q.x, &buf[0]);
 				encode_float(q.y, &buf[4]);
 				encode_float(q.z, &buf[8]);
diff --git a/core/io/packed_data_container.cpp b/core/io/packed_data_container.cpp
index 7565e8e01a..cf6a0b6027 100644
--- a/core/io/packed_data_container.cpp
+++ b/core/io/packed_data_container.cpp
@@ -227,7 +227,7 @@ uint32_t PackedDataContainer::_pack(const Variant &p_data, Vector<uint8_t> &tmpd
 		case Variant::VECTOR3:
 		case Variant::TRANSFORM2D:
 		case Variant::PLANE:
-		case Variant::QUAT:
+		case Variant::QUATERNION:
 		case Variant::AABB:
 		case Variant::BASIS:
 		case Variant::TRANSFORM3D:
diff --git a/core/io/resource_format_binary.cpp b/core/io/resource_format_binary.cpp
index 59474a5bc5..385f15c0cf 100644
--- a/core/io/resource_format_binary.cpp
+++ b/core/io/resource_format_binary.cpp
@@ -51,7 +51,7 @@ enum {
 	VARIANT_RECT2 = 11,
 	VARIANT_VECTOR3 = 12,
 	VARIANT_PLANE = 13,
-	VARIANT_QUAT = 14,
+	VARIANT_QUATERNION = 14,
 	VARIANT_AABB = 15,
 	VARIANT_MATRIX3 = 16,
 	VARIANT_TRANSFORM = 17,
@@ -199,8 +199,8 @@ Error ResourceLoaderBinary::parse_variant(Variant &r_v) {
 			v.d = f->get_real();
 			r_v = v;
 		} break;
-		case VARIANT_QUAT: {
-			Quat v;
+		case VARIANT_QUATERNION: {
+			Quaternion v;
 			v.x = f->get_real();
 			v.y = f->get_real();
 			v.z = f->get_real();
@@ -1371,9 +1371,9 @@ void ResourceFormatSaverBinaryInstance::write_variant(FileAccess *f, const Varia
 			f->store_real(val.d);
 
 		} break;
-		case Variant::QUAT: {
-			f->store_32(VARIANT_QUAT);
-			Quat val = p_property;
+		case Variant::QUATERNION: {
+			f->store_32(VARIANT_QUATERNION);
+			Quaternion val = p_property;
 			f->store_real(val.x);
 			f->store_real(val.y);
 			f->store_real(val.z);
diff --git a/core/math/basis.cpp b/core/math/basis.cpp
index 037378b9d7..7489da34d9 100644
--- a/core/math/basis.cpp
+++ b/core/math/basis.cpp
@@ -345,12 +345,12 @@ void Basis::rotate(const Vector3 &p_euler) {
 	*this = rotated(p_euler);
 }
 
-Basis Basis::rotated(const Quat &p_quat) const {
-	return Basis(p_quat) * (*this);
+Basis Basis::rotated(const Quaternion &p_quaternion) const {
+	return Basis(p_quaternion) * (*this);
 }
 
-void Basis::rotate(const Quat &p_quat) {
-	*this = rotated(p_quat);
+void Basis::rotate(const Quaternion &p_quaternion) {
+	*this = rotated(p_quaternion);
 }
 
 Vector3 Basis::get_rotation_euler() const {
@@ -367,7 +367,7 @@ Vector3 Basis::get_rotation_euler() const {
 	return m.get_euler();
 }
 
-Quat Basis::get_rotation_quat() const {
+Quaternion Basis::get_rotation_quaternion() const {
 	// Assumes that the matrix can be decomposed into a proper rotation and scaling matrix as M = R.S,
 	// and returns the Euler angles corresponding to the rotation part, complementing get_scale().
 	// See the comment in get_scale() for further information.
@@ -378,7 +378,7 @@ Quat Basis::get_rotation_quat() const {
 		m.scale(Vector3(-1, -1, -1));
 	}
 
-	return m.get_quat();
+	return m.get_quaternion();
 }
 
 void Basis::get_rotation_axis_angle(Vector3 &p_axis, real_t &p_angle) const {
@@ -770,9 +770,9 @@ Basis::operator String() const {
 	return mtx;
 }
 
-Quat Basis::get_quat() const {
+Quaternion Basis::get_quaternion() const {
 #ifdef MATH_CHECKS
-	ERR_FAIL_COND_V_MSG(!is_rotation(), Quat(), "Basis must be normalized in order to be casted to a Quaternion. Use get_rotation_quat() or call orthonormalized() instead.");
+	ERR_FAIL_COND_V_MSG(!is_rotation(), Quaternion(), "Basis must be normalized in order to be casted to a Quaternion. Use get_rotation_quaternion() or call orthonormalized() instead.");
 #endif
 	/* Allow getting a quaternion from an unnormalized transform */
 	Basis m = *this;
@@ -803,7 +803,7 @@ Quat Basis::get_quat() const {
 		temp[k] = (m.elements[k][i] + m.elements[i][k]) * s;
 	}
 
-	return Quat(temp[0], temp[1], temp[2], temp[3]);
+	return Quaternion(temp[0], temp[1], temp[2], temp[3]);
 }
 
 static const Basis _ortho_bases[24] = {
@@ -945,13 +945,13 @@ void Basis::get_axis_angle(Vector3 &r_axis, real_t &r_angle) const {
 	r_angle = angle;
 }
 
-void Basis::set_quat(const Quat &p_quat) {
-	real_t d = p_quat.length_squared();
+void Basis::set_quaternion(const Quaternion &p_quaternion) {
+	real_t d = p_quaternion.length_squared();
 	real_t s = 2.0 / d;
-	real_t xs = p_quat.x * s, ys = p_quat.y * s, zs = p_quat.z * s;
-	real_t wx = p_quat.w * xs, wy = p_quat.w * ys, wz = p_quat.w * zs;
-	real_t xx = p_quat.x * xs, xy = p_quat.x * ys, xz = p_quat.x * zs;
-	real_t yy = p_quat.y * ys, yz = p_quat.y * zs, zz = p_quat.z * zs;
+	real_t xs = p_quaternion.x * s, ys = p_quaternion.y * s, zs = p_quaternion.z * s;
+	real_t wx = p_quaternion.w * xs, wy = p_quaternion.w * ys, wz = p_quaternion.w * zs;
+	real_t xx = p_quaternion.x * xs, xy = p_quaternion.x * ys, xz = p_quaternion.x * zs;
+	real_t yy = p_quaternion.y * ys, yz = p_quaternion.y * zs, zz = p_quaternion.z * zs;
 	set(1.0 - (yy + zz), xy - wz, xz + wy,
 			xy + wz, 1.0 - (xx + zz), yz - wx,
 			xz - wy, yz + wx, 1.0 - (xx + yy));
@@ -997,9 +997,9 @@ void Basis::set_euler_scale(const Vector3 &p_euler, const Vector3 &p_scale) {
 	rotate(p_euler);
 }
 
-void Basis::set_quat_scale(const Quat &p_quat, const Vector3 &p_scale) {
+void Basis::set_quaternion_scale(const Quaternion &p_quaternion, const Vector3 &p_scale) {
 	set_diagonal(p_scale);
-	rotate(p_quat);
+	rotate(p_quaternion);
 }
 
 void Basis::set_diagonal(const Vector3 &p_diag) {
@@ -1018,8 +1018,8 @@ void Basis::set_diagonal(const Vector3 &p_diag) {
 
 Basis Basis::slerp(const Basis &p_to, const real_t &p_weight) const {
 	//consider scale
-	Quat from(*this);
-	Quat to(p_to);
+	Quaternion from(*this);
+	Quaternion to(p_to);
 
 	Basis b(from.slerp(to, p_weight));
 	b.elements[0] *= Math::lerp(elements[0].length(), p_to.elements[0].length(), p_weight);
diff --git a/core/math/basis.h b/core/math/basis.h
index 56f6227313..3736047dd3 100644
--- a/core/math/basis.h
+++ b/core/math/basis.h
@@ -31,7 +31,7 @@
 #ifndef BASIS_H
 #define BASIS_H
 
-#include "core/math/quat.h"
+#include "core/math/quaternion.h"
 #include "core/math/vector3.h"
 
 class Basis {
@@ -79,13 +79,13 @@ public:
 	void rotate(const Vector3 &p_euler);
 	Basis rotated(const Vector3 &p_euler) const;
 
-	void rotate(const Quat &p_quat);
-	Basis rotated(const Quat &p_quat) const;
+	void rotate(const Quaternion &p_quaternion);
+	Basis rotated(const Quaternion &p_quaternion) const;
 
 	Vector3 get_rotation_euler() const;
 	void get_rotation_axis_angle(Vector3 &p_axis, real_t &p_angle) const;
 	void get_rotation_axis_angle_local(Vector3 &p_axis, real_t &p_angle) const;
-	Quat get_rotation_quat() const;
+	Quaternion get_rotation_quaternion() const;
 	Vector3 get_rotation() const { return get_rotation_euler(); };
 
 	Vector3 rotref_posscale_decomposition(Basis &rotref) const;
@@ -108,8 +108,8 @@ public:
 	Vector3 get_euler_zyx() const;
 	void set_euler_zyx(const Vector3 &p_euler);
 
-	Quat get_quat() const;
-	void set_quat(const Quat &p_quat);
+	Quaternion get_quaternion() const;
+	void set_quaternion(const Quaternion &p_quaternion);
 
 	Vector3 get_euler() const { return get_euler_yxz(); }
 	void set_euler(const Vector3 &p_euler) { set_euler_yxz(p_euler); }
@@ -132,7 +132,7 @@ public:
 
 	void set_axis_angle_scale(const Vector3 &p_axis, real_t p_phi, const Vector3 &p_scale);
 	void set_euler_scale(const Vector3 &p_euler, const Vector3 &p_scale);
-	void set_quat_scale(const Quat &p_quat, const Vector3 &p_scale);
+	void set_quaternion_scale(const Quaternion &p_quaternion, const Vector3 &p_scale);
 
 	// transposed dot products
 	_FORCE_INLINE_ real_t tdotx(const Vector3 &v) const {
@@ -240,10 +240,10 @@ public:
 #endif
 	Basis diagonalize();
 
-	operator Quat() const { return get_quat(); }
+	operator Quaternion() const { return get_quaternion(); }
 
-	Basis(const Quat &p_quat) { set_quat(p_quat); };
-	Basis(const Quat &p_quat, const Vector3 &p_scale) { set_quat_scale(p_quat, p_scale); }
+	Basis(const Quaternion &p_quaternion) { set_quaternion(p_quaternion); };
+	Basis(const Quaternion &p_quaternion, const Vector3 &p_scale) { set_quaternion_scale(p_quaternion, p_scale); }
 
 	Basis(const Vector3 &p_euler) { set_euler(p_euler); }
 	Basis(const Vector3 &p_euler, const Vector3 &p_scale) { set_euler_scale(p_euler, p_scale); }
diff --git a/core/math/math_fieldwise.cpp b/core/math/math_fieldwise.cpp
index f2baef1a59..570c57e254 100644
--- a/core/math/math_fieldwise.cpp
+++ b/core/math/math_fieldwise.cpp
@@ -88,8 +88,8 @@ Variant fieldwise_assign(const Variant &p_target, const Variant &p_source, const
 			return target;
 		}
 
-		case Variant::QUAT: {
-			SETUP_TYPE(Quat)
+		case Variant::QUATERNION: {
+			SETUP_TYPE(Quaternion)
 
 			/**/ TRY_TRANSFER_FIELD("x", x)
 			else TRY_TRANSFER_FIELD("y", y)
diff --git a/core/math/quat.cpp b/core/math/quaternion.cpp
index 3982a0b993..8de3d0cc2a 100644
--- a/core/math/quat.cpp
+++ b/core/math/quaternion.cpp
@@ -1,5 +1,5 @@
 /*************************************************************************/
-/*  quat.cpp                                                             */
+/*  quaternion.cpp                                                       */
 /*************************************************************************/
 /*                       This file is part of:                           */
 /*                           GODOT ENGINE                                */
@@ -28,7 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#include "quat.h"
+#include "quaternion.h"
 
 #include "core/math/basis.h"
 #include "core/string/print_string.h"
@@ -37,7 +37,7 @@
 // (ax,ay,az), where ax is the angle of rotation around x axis,
 // and similar for other axes.
 // This implementation uses XYZ convention (Z is the first rotation).
-Vector3 Quat::get_euler_xyz() const {
+Vector3 Quaternion::get_euler_xyz() const {
 	Basis m(*this);
 	return m.get_euler_xyz();
 }
@@ -46,7 +46,7 @@ Vector3 Quat::get_euler_xyz() const {
 // (ax,ay,az), where ax is the angle of rotation around x axis,
 // and similar for other axes.
 // This implementation uses YXZ convention (Z is the first rotation).
-Vector3 Quat::get_euler_yxz() const {
+Vector3 Quaternion::get_euler_yxz() const {
 #ifdef MATH_CHECKS
 	ERR_FAIL_COND_V_MSG(!is_normalized(), Vector3(0, 0, 0), "The quaternion must be normalized.");
 #endif
@@ -54,7 +54,7 @@ Vector3 Quat::get_euler_yxz() const {
 	return m.get_euler_yxz();
 }
 
-void Quat::operator*=(const Quat &p_q) {
+void Quaternion::operator*=(const Quaternion &p_q) {
 	real_t xx = w * p_q.x + x * p_q.w + y * p_q.z - z * p_q.y;
 	real_t yy = w * p_q.y + y * p_q.w + z * p_q.x - x * p_q.z;
 	real_t zz = w * p_q.z + z * p_q.w + x * p_q.y - y * p_q.x;
@@ -64,45 +64,45 @@ void Quat::operator*=(const Quat &p_q) {
 	z = zz;
 }
 
-Quat Quat::operator*(const Quat &p_q) const {
-	Quat r = *this;
+Quaternion Quaternion::operator*(const Quaternion &p_q) const {
+	Quaternion r = *this;
 	r *= p_q;
 	return r;
 }
 
-bool Quat::is_equal_approx(const Quat &p_quat) const {
-	return Math::is_equal_approx(x, p_quat.x) && Math::is_equal_approx(y, p_quat.y) && Math::is_equal_approx(z, p_quat.z) && Math::is_equal_approx(w, p_quat.w);
+bool Quaternion::is_equal_approx(const Quaternion &p_quaternion) const {
+	return Math::is_equal_approx(x, p_quaternion.x) && Math::is_equal_approx(y, p_quaternion.y) && Math::is_equal_approx(z, p_quaternion.z) && Math::is_equal_approx(w, p_quaternion.w);
 }
 
-real_t Quat::length() const {
+real_t Quaternion::length() const {
 	return Math::sqrt(length_squared());
 }
 
-void Quat::normalize() {
+void Quaternion::normalize() {
 	*this /= length();
 }
 
-Quat Quat::normalized() const {
+Quaternion Quaternion::normalized() const {
 	return *this / length();
 }
 
-bool Quat::is_normalized() const {
+bool Quaternion::is_normalized() const {
 	return Math::is_equal_approx(length_squared(), 1, (real_t)UNIT_EPSILON); //use less epsilon
 }
 
-Quat Quat::inverse() const {
+Quaternion Quaternion::inverse() const {
 #ifdef MATH_CHECKS
-	ERR_FAIL_COND_V_MSG(!is_normalized(), Quat(), "The quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!is_normalized(), Quaternion(), "The quaternion must be normalized.");
 #endif
-	return Quat(-x, -y, -z, w);
+	return Quaternion(-x, -y, -z, w);
 }
 
-Quat Quat::slerp(const Quat &p_to, const real_t &p_weight) const {
+Quaternion Quaternion::slerp(const Quaternion &p_to, const real_t &p_weight) const {
 #ifdef MATH_CHECKS
-	ERR_FAIL_COND_V_MSG(!is_normalized(), Quat(), "The start quaternion must be normalized.");
-	ERR_FAIL_COND_V_MSG(!p_to.is_normalized(), Quat(), "The end quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!is_normalized(), Quaternion(), "The start quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!p_to.is_normalized(), Quaternion(), "The end quaternion must be normalized.");
 #endif
-	Quat to1;
+	Quaternion to1;
 	real_t omega, cosom, sinom, scale0, scale1;
 
 	// calc cosine
@@ -137,19 +137,19 @@ Quat Quat::slerp(const Quat &p_to, const real_t &p_weight) const {
 		scale1 = p_weight;
 	}
 	// calculate final values
-	return Quat(
+	return Quaternion(
 			scale0 * x + scale1 * to1.x,
 			scale0 * y + scale1 * to1.y,
 			scale0 * z + scale1 * to1.z,
 			scale0 * w + scale1 * to1.w);
 }
 
-Quat Quat::slerpni(const Quat &p_to, const real_t &p_weight) const {
+Quaternion Quaternion::slerpni(const Quaternion &p_to, const real_t &p_weight) const {
 #ifdef MATH_CHECKS
-	ERR_FAIL_COND_V_MSG(!is_normalized(), Quat(), "The start quaternion must be normalized.");
-	ERR_FAIL_COND_V_MSG(!p_to.is_normalized(), Quat(), "The end quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!is_normalized(), Quaternion(), "The start quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!p_to.is_normalized(), Quaternion(), "The end quaternion must be normalized.");
 #endif
-	const Quat &from = *this;
+	const Quaternion &from = *this;
 
 	real_t dot = from.dot(p_to);
 
@@ -162,29 +162,29 @@ Quat Quat::slerpni(const Quat &p_to, const real_t &p_weight) const {
 		   newFactor = Math::sin(p_weight * theta) * sinT,
 		   invFactor = Math::sin((1.0 - p_weight) * theta) * sinT;
 
-	return Quat(invFactor * from.x + newFactor * p_to.x,
+	return Quaternion(invFactor * from.x + newFactor * p_to.x,
 			invFactor * from.y + newFactor * p_to.y,
 			invFactor * from.z + newFactor * p_to.z,
 			invFactor * from.w + newFactor * p_to.w);
 }
 
-Quat Quat::cubic_slerp(const Quat &p_b, const Quat &p_pre_a, const Quat &p_post_b, const real_t &p_weight) const {
+Quaternion Quaternion::cubic_slerp(const Quaternion &p_b, const Quaternion &p_pre_a, const Quaternion &p_post_b, const real_t &p_weight) const {
 #ifdef MATH_CHECKS
-	ERR_FAIL_COND_V_MSG(!is_normalized(), Quat(), "The start quaternion must be normalized.");
-	ERR_FAIL_COND_V_MSG(!p_b.is_normalized(), Quat(), "The end quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!is_normalized(), Quaternion(), "The start quaternion must be normalized.");
+	ERR_FAIL_COND_V_MSG(!p_b.is_normalized(), Quaternion(), "The end quaternion must be normalized.");
 #endif
 	//the only way to do slerp :|
 	real_t t2 = (1.0 - p_weight) * p_weight * 2;
-	Quat sp = this->slerp(p_b, p_weight);
-	Quat sq = p_pre_a.slerpni(p_post_b, p_weight);
+	Quaternion sp = this->slerp(p_b, p_weight);
+	Quaternion sq = p_pre_a.slerpni(p_post_b, p_weight);
 	return sp.slerpni(sq, t2);
 }
 
-Quat::operator String() const {
+Quaternion::operator String() const {
 	return String::num(x) + ", " + String::num(y) + ", " + String::num(z) + ", " + String::num(w);
 }
 
-Quat::Quat(const Vector3 &p_axis, real_t p_angle) {
+Quaternion::Quaternion(const Vector3 &p_axis, real_t p_angle) {
 #ifdef MATH_CHECKS
 	ERR_FAIL_COND_MSG(!p_axis.is_normalized(), "The axis Vector3 must be normalized.");
 #endif
@@ -209,7 +209,7 @@ Quat::Quat(const Vector3 &p_axis, real_t p_angle) {
 // (ax, ay, az), where ax is the angle of rotation around x axis,
 // and similar for other axes.
 // This implementation uses YXZ convention (Z is the first rotation).
-Quat::Quat(const Vector3 &p_euler) {
+Quaternion::Quaternion(const Vector3 &p_euler) {
 	real_t half_a1 = p_euler.y * 0.5;
 	real_t half_a2 = p_euler.x * 0.5;
 	real_t half_a3 = p_euler.z * 0.5;
diff --git a/core/math/quat.h b/core/math/quaternion.h
index d9b130c050..796214b79e 100644
--- a/core/math/quat.h
+++ b/core/math/quaternion.h
@@ -1,5 +1,5 @@
 /*************************************************************************/
-/*  quat.h                                                               */
+/*  quaternion.h                                                         */
 /*************************************************************************/
 /*                       This file is part of:                           */
 /*                           GODOT ENGINE                                */
@@ -36,7 +36,7 @@
 #include "core/math/vector3.h"
 #include "core/string/ustring.h"
 
-class Quat {
+class Quaternion {
 public:
 	union {
 		struct {
@@ -55,21 +55,21 @@ public:
 		return components[idx];
 	}
 	_FORCE_INLINE_ real_t length_squared() const;
-	bool is_equal_approx(const Quat &p_quat) const;
+	bool is_equal_approx(const Quaternion &p_quaternion) const;
 	real_t length() const;
 	void normalize();
-	Quat normalized() const;
+	Quaternion normalized() const;
 	bool is_normalized() const;
-	Quat inverse() const;
-	_FORCE_INLINE_ real_t dot(const Quat &p_q) const;
+	Quaternion inverse() const;
+	_FORCE_INLINE_ real_t dot(const Quaternion &p_q) const;
 
 	Vector3 get_euler_xyz() const;
 	Vector3 get_euler_yxz() const;
 	Vector3 get_euler() const { return get_euler_yxz(); };
 
-	Quat slerp(const Quat &p_to, const real_t &p_weight) const;
-	Quat slerpni(const Quat &p_to, const real_t &p_weight) const;
-	Quat cubic_slerp(const Quat &p_b, const Quat &p_pre_a, const Quat &p_post_b, const real_t &p_weight) const;
+	Quaternion slerp(const Quaternion &p_to, const real_t &p_weight) const;
+	Quaternion slerpni(const Quaternion &p_to, const real_t &p_weight) const;
+	Quaternion cubic_slerp(const Quaternion &p_b, const Quaternion &p_pre_a, const Quaternion &p_post_b, const real_t &p_weight) const;
 
 	_FORCE_INLINE_ void get_axis_angle(Vector3 &r_axis, real_t &r_angle) const {
 		r_angle = 2 * Math::acos(w);
@@ -79,11 +79,11 @@ public:
 		r_axis.z = z * r;
 	}
 
-	void operator*=(const Quat &p_q);
-	Quat operator*(const Quat &p_q) const;
+	void operator*=(const Quaternion &p_q);
+	Quaternion operator*(const Quaternion &p_q) const;
 
-	Quat operator*(const Vector3 &v) const {
-		return Quat(w * v.x + y * v.z - z * v.y,
+	Quaternion operator*(const Vector3 &v) const {
+		return Quaternion(w * v.x + y * v.z - z * v.y,
 				w * v.y + z * v.x - x * v.z,
 				w * v.z + x * v.y - y * v.x,
 				-x * v.x - y * v.y - z * v.z);
@@ -102,42 +102,42 @@ public:
 		return inverse().xform(v);
 	}
 
-	_FORCE_INLINE_ void operator+=(const Quat &p_q);
-	_FORCE_INLINE_ void operator-=(const Quat &p_q);
+	_FORCE_INLINE_ void operator+=(const Quaternion &p_q);
+	_FORCE_INLINE_ void operator-=(const Quaternion &p_q);
 	_FORCE_INLINE_ void operator*=(const real_t &s);
 	_FORCE_INLINE_ void operator/=(const real_t &s);
-	_FORCE_INLINE_ Quat operator+(const Quat &q2) const;
-	_FORCE_INLINE_ Quat operator-(const Quat &q2) const;
-	_FORCE_INLINE_ Quat operator-() const;
-	_FORCE_INLINE_ Quat operator*(const real_t &s) const;
-	_FORCE_INLINE_ Quat operator/(const real_t &s) const;
+	_FORCE_INLINE_ Quaternion operator+(const Quaternion &q2) const;
+	_FORCE_INLINE_ Quaternion operator-(const Quaternion &q2) const;
+	_FORCE_INLINE_ Quaternion operator-() const;
+	_FORCE_INLINE_ Quaternion operator*(const real_t &s) const;
+	_FORCE_INLINE_ Quaternion operator/(const real_t &s) const;
 
-	_FORCE_INLINE_ bool operator==(const Quat &p_quat) const;
-	_FORCE_INLINE_ bool operator!=(const Quat &p_quat) const;
+	_FORCE_INLINE_ bool operator==(const Quaternion &p_quaternion) const;
+	_FORCE_INLINE_ bool operator!=(const Quaternion &p_quaternion) const;
 
 	operator String() const;
 
-	_FORCE_INLINE_ Quat() {}
+	_FORCE_INLINE_ Quaternion() {}
 
-	_FORCE_INLINE_ Quat(real_t p_x, real_t p_y, real_t p_z, real_t p_w) :
+	_FORCE_INLINE_ Quaternion(real_t p_x, real_t p_y, real_t p_z, real_t p_w) :
 			x(p_x),
 			y(p_y),
 			z(p_z),
 			w(p_w) {
 	}
 
-	Quat(const Vector3 &p_axis, real_t p_angle);
+	Quaternion(const Vector3 &p_axis, real_t p_angle);
 
-	Quat(const Vector3 &p_euler);
+	Quaternion(const Vector3 &p_euler);
 
-	Quat(const Quat &p_q) :
+	Quaternion(const Quaternion &p_q) :
 			x(p_q.x),
 			y(p_q.y),
 			z(p_q.z),
 			w(p_q.w) {
 	}
 
-	Quat &operator=(const Quat &p_q) {
+	Quaternion &operator=(const Quaternion &p_q) {
 		x = p_q.x;
 		y = p_q.y;
 		z = p_q.z;
@@ -145,7 +145,7 @@ public:
 		return *this;
 	}
 
-	Quat(const Vector3 &v0, const Vector3 &v1) // shortest arc
+	Quaternion(const Vector3 &v0, const Vector3 &v1) // shortest arc
 	{
 		Vector3 c = v0.cross(v1);
 		real_t d = v0.dot(v1);
@@ -167,72 +167,72 @@ public:
 	}
 };
 
-real_t Quat::dot(const Quat &p_q) const {
+real_t Quaternion::dot(const Quaternion &p_q) const {
 	return x * p_q.x + y * p_q.y + z * p_q.z + w * p_q.w;
 }
 
-real_t Quat::length_squared() const {
+real_t Quaternion::length_squared() const {
 	return dot(*this);
 }
 
-void Quat::operator+=(const Quat &p_q) {
+void Quaternion::operator+=(const Quaternion &p_q) {
 	x += p_q.x;
 	y += p_q.y;
 	z += p_q.z;
 	w += p_q.w;
 }
 
-void Quat::operator-=(const Quat &p_q) {
+void Quaternion::operator-=(const Quaternion &p_q) {
 	x -= p_q.x;
 	y -= p_q.y;
 	z -= p_q.z;
 	w -= p_q.w;
 }
 
-void Quat::operator*=(const real_t &s) {
+void Quaternion::operator*=(const real_t &s) {
 	x *= s;
 	y *= s;
 	z *= s;
 	w *= s;
 }
 
-void Quat::operator/=(const real_t &s) {
+void Quaternion::operator/=(const real_t &s) {
 	*this *= 1.0 / s;
 }
 
-Quat Quat::operator+(const Quat &q2) const {
-	const Quat &q1 = *this;
-	return Quat(q1.x + q2.x, q1.y + q2.y, q1.z + q2.z, q1.w + q2.w);
+Quaternion Quaternion::operator+(const Quaternion &q2) const {
+	const Quaternion &q1 = *this;
+	return Quaternion(q1.x + q2.x, q1.y + q2.y, q1.z + q2.z, q1.w + q2.w);
 }
 
-Quat Quat::operator-(const Quat &q2) const {
-	const Quat &q1 = *this;
-	return Quat(q1.x - q2.x, q1.y - q2.y, q1.z - q2.z, q1.w - q2.w);
+Quaternion Quaternion::operator-(const Quaternion &q2) const {
+	const Quaternion &q1 = *this;
+	return Quaternion(q1.x - q2.x, q1.y - q2.y, q1.z - q2.z, q1.w - q2.w);
 }
 
-Quat Quat::operator-() const {
-	const Quat &q2 = *this;
-	return Quat(-q2.x, -q2.y, -q2.z, -q2.w);
+Quaternion Quaternion::operator-() const {
+	const Quaternion &q2 = *this;
+	return Quaternion(-q2.x, -q2.y, -q2.z, -q2.w);
 }
 
-Quat Quat::operator*(const real_t &s) const {
-	return Quat(x * s, y * s, z * s, w * s);
+Quaternion Quaternion::operator*(const real_t &s) const {
+	return Quaternion(x * s, y * s, z * s, w * s);
 }
 
-Quat Quat::operator/(const real_t &s) const {
+Quaternion Quaternion::operator/(const real_t &s) const {
 	return *this * (1.0 / s);
 }
 
-bool Quat::operator==(const Quat &p_quat) const {
-	return x == p_quat.x && y == p_quat.y && z == p_quat.z && w == p_quat.w;
+bool Quaternion::operator==(const Quaternion &p_quaternion) const {
+	return x == p_quaternion.x && y == p_quaternion.y && z == p_quaternion.z && w == p_quaternion.w;
 }
 
-bool Quat::operator!=(const Quat &p_quat) const {
-	return x != p_quat.x || y != p_quat.y || z != p_quat.z || w != p_quat.w;
+bool Quaternion::operator!=(const Quaternion &p_quaternion) const {
+	return x != p_quaternion.x || y != p_quaternion.y || z != p_quaternion.z || w != p_quaternion.w;
 }
 
-_FORCE_INLINE_ Quat operator*(const real_t &p_real, const Quat &p_quat) {
-	return p_quat * p_real;
+_FORCE_INLINE_ Quaternion operator*(const real_t &p_real, const Quaternion &p_quaternion) {
+	return p_quaternion * p_real;
 }
 
 #endif // QUAT_H
diff --git a/core/math/transform_3d.cpp b/core/math/transform_3d.cpp
index 2611d6accf..210f0b81bb 100644
--- a/core/math/transform_3d.cpp
+++ b/core/math/transform_3d.cpp
@@ -112,15 +112,15 @@ Transform3D Transform3D::interpolate_with(const Transform3D &p_transform, real_t
 	/* not sure if very "efficient" but good enough? */
 
 	Vector3 src_scale = basis.get_scale();
-	Quat src_rot = basis.get_rotation_quat();
+	Quaternion src_rot = basis.get_rotation_quaternion();
 	Vector3 src_loc = origin;
 
 	Vector3 dst_scale = p_transform.basis.get_scale();
-	Quat dst_rot = p_transform.basis.get_rotation_quat();
+	Quaternion dst_rot = p_transform.basis.get_rotation_quaternion();
 	Vector3 dst_loc = p_transform.origin;
 
 	Transform3D interp;
-	interp.basis.set_quat_scale(src_rot.slerp(dst_rot, p_c).normalized(), src_scale.lerp(dst_scale, p_c));
+	interp.basis.set_quaternion_scale(src_rot.slerp(dst_rot, p_c).normalized(), src_scale.lerp(dst_scale, p_c));
 	interp.origin = src_loc.lerp(dst_loc, p_c);
 
 	return interp;
diff --git a/core/variant/method_ptrcall.h b/core/variant/method_ptrcall.h
index f863962111..d4ec5e570c 100644
--- a/core/variant/method_ptrcall.h
+++ b/core/variant/method_ptrcall.h
@@ -122,7 +122,7 @@ MAKE_PTRARG_BY_REFERENCE(Vector3);
 MAKE_PTRARG_BY_REFERENCE(Vector3i);
 MAKE_PTRARG(Transform2D);
 MAKE_PTRARG_BY_REFERENCE(Plane);
-MAKE_PTRARG(Quat);
+MAKE_PTRARG(Quaternion);
 MAKE_PTRARG_BY_REFERENCE(AABB);
 MAKE_PTRARG_BY_REFERENCE(Basis);
 MAKE_PTRARG_BY_REFERENCE(Transform3D);
diff --git a/core/variant/type_info.h b/core/variant/type_info.h
index 5712c90f4c..76cb065d10 100644
--- a/core/variant/type_info.h
+++ b/core/variant/type_info.h
@@ -146,7 +146,7 @@ MAKE_TYPE_INFO(Rect2i, Variant::RECT2I)
 MAKE_TYPE_INFO(Vector3i, Variant::VECTOR3I)
 MAKE_TYPE_INFO(Transform2D, Variant::TRANSFORM2D)
 MAKE_TYPE_INFO(Plane, Variant::PLANE)
-MAKE_TYPE_INFO(Quat, Variant::QUAT)
+MAKE_TYPE_INFO(Quaternion, Variant::QUATERNION)
 MAKE_TYPE_INFO(AABB, Variant::AABB)
 MAKE_TYPE_INFO(Basis, Variant::BASIS)
 MAKE_TYPE_INFO(Transform3D, Variant::TRANSFORM3D)
diff --git a/core/variant/typed_array.h b/core/variant/typed_array.h
index 95c0578543..900dcf7689 100644
--- a/core/variant/typed_array.h
+++ b/core/variant/typed_array.h
@@ -98,7 +98,7 @@ MAKE_TYPED_ARRAY(Vector3, Variant::VECTOR3)
 MAKE_TYPED_ARRAY(Vector3i, Variant::VECTOR3I)
 MAKE_TYPED_ARRAY(Transform2D, Variant::TRANSFORM2D)
 MAKE_TYPED_ARRAY(Plane, Variant::PLANE)
-MAKE_TYPED_ARRAY(Quat, Variant::QUAT)
+MAKE_TYPED_ARRAY(Quaternion, Variant::QUATERNION)
 MAKE_TYPED_ARRAY(AABB, Variant::AABB)
 MAKE_TYPED_ARRAY(Basis, Variant::BASIS)
 MAKE_TYPED_ARRAY(Transform3D, Variant::TRANSFORM3D)
@@ -196,7 +196,7 @@ MAKE_TYPED_ARRAY_INFO(Vector3, Variant::VECTOR3)
 MAKE_TYPED_ARRAY_INFO(Vector3i, Variant::VECTOR3I)
 MAKE_TYPED_ARRAY_INFO(Transform2D, Variant::TRANSFORM2D)
 MAKE_TYPED_ARRAY_INFO(Plane, Variant::PLANE)
-MAKE_TYPED_ARRAY_INFO(Quat, Variant::QUAT)
+MAKE_TYPED_ARRAY_INFO(Quaternion, Variant::QUATERNION)
 MAKE_TYPED_ARRAY_INFO(AABB, Variant::AABB)
 MAKE_TYPED_ARRAY_INFO(Basis, Variant::BASIS)
 MAKE_TYPED_ARRAY_INFO(Transform3D, Variant::TRANSFORM3D)
diff --git a/core/variant/variant.cpp b/core/variant/variant.cpp
index d77b7ef140..2bde08742c 100644
--- a/core/variant/variant.cpp
+++ b/core/variant/variant.cpp
@@ -91,8 +91,8 @@ String Variant::get_type_name(Variant::Type p_type) {
 		case AABB: {
 			return "AABB";
 		} break;
-		case QUAT: {
-			return "Quat";
+		case QUATERNION: {
+			return "Quaternion";
 
 		} break;
 		case BASIS: {
@@ -300,7 +300,7 @@ bool Variant::can_convert(Variant::Type p_type_from, Variant::Type p_type_to) {
 
 		} break;
 
-		case QUAT: {
+		case QUATERNION: {
 			static const Type valid[] = {
 				BASIS,
 				NIL
@@ -311,7 +311,7 @@ bool Variant::can_convert(Variant::Type p_type_from, Variant::Type p_type_to) {
 		} break;
 		case BASIS: {
 			static const Type valid[] = {
-				QUAT,
+				QUATERNION,
 				VECTOR3,
 				NIL
 			};
@@ -322,7 +322,7 @@ bool Variant::can_convert(Variant::Type p_type_from, Variant::Type p_type_to) {
 		case TRANSFORM3D: {
 			static const Type valid[] = {
 				TRANSFORM2D,
-				QUAT,
+				QUATERNION,
 				BASIS,
 				NIL
 			};
@@ -607,7 +607,7 @@ bool Variant::can_convert_strict(Variant::Type p_type_from, Variant::Type p_type
 
 		} break;
 
-		case QUAT: {
+		case QUATERNION: {
 			static const Type valid[] = {
 				BASIS,
 				NIL
@@ -618,7 +618,7 @@ bool Variant::can_convert_strict(Variant::Type p_type_from, Variant::Type p_type
 		} break;
 		case BASIS: {
 			static const Type valid[] = {
-				QUAT,
+				QUATERNION,
 				VECTOR3,
 				NIL
 			};
@@ -629,7 +629,7 @@ bool Variant::can_convert_strict(Variant::Type p_type_from, Variant::Type p_type
 		case TRANSFORM3D: {
 			static const Type valid[] = {
 				TRANSFORM2D,
-				QUAT,
+				QUATERNION,
 				BASIS,
 				NIL
 			};
@@ -873,8 +873,8 @@ bool Variant::is_zero() const {
 		case AABB: {
 			return *_data._aabb == ::AABB();
 		} break;
-		case QUAT: {
-			return *reinterpret_cast<const Quat *>(_data._mem) == Quat();
+		case QUATERNION: {
+			return *reinterpret_cast<const Quaternion *>(_data._mem) == Quaternion();
 
 		} break;
 		case BASIS: {
@@ -1092,8 +1092,8 @@ void Variant::reference(const Variant &p_variant) {
 		case AABB: {
 			_data._aabb = memnew(::AABB(*p_variant._data._aabb));
 		} break;
-		case QUAT: {
-			memnew_placement(_data._mem, Quat(*reinterpret_cast<const Quat *>(p_variant._data._mem)));
+		case QUATERNION: {
+			memnew_placement(_data._mem, Quaternion(*reinterpret_cast<const Quaternion *>(p_variant._data._mem)));
 
 		} break;
 		case BASIS: {
@@ -1254,8 +1254,8 @@ void Variant::zero() {
 		case PLANE:
 			*reinterpret_cast<Plane *>(this->_data._mem) = Plane();
 			break;
-		case QUAT:
-			*reinterpret_cast<Quat *>(this->_data._mem) = Quat();
+		case QUATERNION:
+			*reinterpret_cast<Quaternion *>(this->_data._mem) = Quaternion();
 			break;
 		case COLOR:
 			*reinterpret_cast<Color *>(this->_data._mem) = Color();
@@ -1275,7 +1275,7 @@ void Variant::_clear_internal() {
 		// no point, they don't allocate memory
 		VECTOR3,
 		PLANE,
-		QUAT,
+		QUATERNION,
 		COLOR,
 		VECTOR2,
 		RECT2
@@ -1653,11 +1653,10 @@ String Variant::stringify(List<const void *> &stack) const {
 			return "(" + operator Vector3i() + ")";
 		case PLANE:
 			return operator Plane();
-		//case QUAT:
 		case AABB:
 			return operator ::AABB();
-		case QUAT:
-			return "(" + operator Quat() + ")";
+		case QUATERNION:
+			return "(" + operator Quaternion() + ")";
 		case BASIS: {
 			Basis mat3 = operator Basis();
 
@@ -1956,8 +1955,8 @@ Variant::operator ::AABB() const {
 Variant::operator Basis() const {
 	if (type == BASIS) {
 		return *_data._basis;
-	} else if (type == QUAT) {
-		return *reinterpret_cast<const Quat *>(_data._mem);
+	} else if (type == QUATERNION) {
+		return *reinterpret_cast<const Quaternion *>(_data._mem);
 	} else if (type == VECTOR3) {
 		return Basis(*reinterpret_cast<const Vector3 *>(_data._mem));
 	} else if (type == TRANSFORM3D) { // unexposed in Variant::can_convert?
@@ -1967,15 +1966,15 @@ Variant::operator Basis() const {
 	}
 }
 
-Variant::operator Quat() const {
-	if (type == QUAT) {
-		return *reinterpret_cast<const Quat *>(_data._mem);
+Variant::operator Quaternion() const {
+	if (type == QUATERNION) {
+		return *reinterpret_cast<const Quaternion *>(_data._mem);
 	} else if (type == BASIS) {
 		return *_data._basis;
 	} else if (type == TRANSFORM3D) {
 		return _data._transform3d->basis;
 	} else {
-		return Quat();
+		return Quaternion();
 	}
 }
 
@@ -1984,8 +1983,8 @@ Variant::operator Transform3D() const {
 		return *_data._transform3d;
 	} else if (type == BASIS) {
 		return Transform3D(*_data._basis, Vector3());
-	} else if (type == QUAT) {
-		return Transform3D(Basis(*reinterpret_cast<const Quat *>(_data._mem)), Vector3());
+	} else if (type == QUATERNION) {
+		return Transform3D(Basis(*reinterpret_cast<const Quaternion *>(_data._mem)), Vector3());
 	} else if (type == TRANSFORM2D) {
 		const Transform2D &t = *_data._transform2d;
 		Transform3D m;
@@ -2495,9 +2494,9 @@ Variant::Variant(const Basis &p_matrix) {
 	_data._basis = memnew(Basis(p_matrix));
 }
 
-Variant::Variant(const Quat &p_quat) {
-	type = QUAT;
-	memnew_placement(_data._mem, Quat(p_quat));
+Variant::Variant(const Quaternion &p_quaternion) {
+	type = QUATERNION;
+	memnew_placement(_data._mem, Quaternion(p_quaternion));
 }
 
 Variant::Variant(const Transform3D &p_transform) {
@@ -2739,8 +2738,8 @@ void Variant::operator=(const Variant &p_variant) {
 		case AABB: {
 			*_data._aabb = *(p_variant._data._aabb);
 		} break;
-		case QUAT: {
-			*reinterpret_cast<Quat *>(_data._mem) = *reinterpret_cast<const Quat *>(p_variant._data._mem);
+		case QUATERNION: {
+			*reinterpret_cast<Quaternion *>(_data._mem) = *reinterpret_cast<const Quaternion *>(p_variant._data._mem);
 		} break;
 		case BASIS: {
 			*_data._basis = *(p_variant._data._basis);
@@ -2916,11 +2915,11 @@ uint32_t Variant::hash() const {
 			return hash;
 
 		} break;
-		case QUAT: {
-			uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Quat *>(_data._mem)->x);
-			hash = hash_djb2_one_float(reinterpret_cast<const Quat *>(_data._mem)->y, hash);
-			hash = hash_djb2_one_float(reinterpret_cast<const Quat *>(_data._mem)->z, hash);
-			return hash_djb2_one_float(reinterpret_cast<const Quat *>(_data._mem)->w, hash);
+		case QUATERNION: {
+			uint32_t hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->x);
+			hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->y, hash);
+			hash = hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->z, hash);
+			return hash_djb2_one_float(reinterpret_cast<const Quaternion *>(_data._mem)->w, hash);
 
 		} break;
 		case BASIS: {
@@ -3127,7 +3126,7 @@ uint32_t Variant::hash() const {
 			(hash_compare_scalar((p_lhs).y, (p_rhs).y)) && \
 			(hash_compare_scalar((p_lhs).z, (p_rhs).z))
 
-#define hash_compare_quat(p_lhs, p_rhs)                    \
+#define hash_compare_quaternion(p_lhs, p_rhs)              \
 	(hash_compare_scalar((p_lhs).x, (p_rhs).x)) &&         \
 			(hash_compare_scalar((p_lhs).y, (p_rhs).y)) && \
 			(hash_compare_scalar((p_lhs).z, (p_rhs).z)) && \
@@ -3235,11 +3234,11 @@ bool Variant::hash_compare(const Variant &p_variant) const {
 
 		} break;
 
-		case QUAT: {
-			const Quat *l = reinterpret_cast<const Quat *>(_data._mem);
-			const Quat *r = reinterpret_cast<const Quat *>(p_variant._data._mem);
+		case QUATERNION: {
+			const Quaternion *l = reinterpret_cast<const Quaternion *>(_data._mem);
+			const Quaternion *r = reinterpret_cast<const Quaternion *>(p_variant._data._mem);
 
-			return hash_compare_quat(*l, *r);
+			return hash_compare_quaternion(*l, *r);
 		} break;
 
 		case BASIS: {
diff --git a/core/variant/variant.h b/core/variant/variant.h
index 4945e967eb..75316da63f 100644
--- a/core/variant/variant.h
+++ b/core/variant/variant.h
@@ -37,7 +37,7 @@
 #include "core/math/color.h"
 #include "core/math/face3.h"
 #include "core/math/plane.h"
-#include "core/math/quat.h"
+#include "core/math/quaternion.h"
 #include "core/math/transform_2d.h"
 #include "core/math/transform_3d.h"
 #include "core/math/vector3.h"
@@ -88,7 +88,7 @@ public:
 		VECTOR3I,
 		TRANSFORM2D,
 		PLANE,
-		QUAT,
+		QUATERNION,
 		AABB,
 		BASIS,
 		TRANSFORM3D,
@@ -225,7 +225,7 @@ private:
 			false, //VECTOR3I,
 			true, //TRANSFORM2D,
 			false, //PLANE,
-			false, //QUAT,
+			false, //QUATERNION,
 			true, //AABB,
 			true, //BASIS,
 			true, //TRANSFORM,
@@ -320,7 +320,7 @@ public:
 	operator Vector3i() const;
 	operator Plane() const;
 	operator ::AABB() const;
-	operator Quat() const;
+	operator Quaternion() const;
 	operator Basis() const;
 	operator Transform2D() const;
 	operator Transform3D() const;
@@ -392,7 +392,7 @@ public:
 	Variant(const Vector3i &p_vector3i);
 	Variant(const Plane &p_plane);
 	Variant(const ::AABB &p_aabb);
-	Variant(const Quat &p_quat);
+	Variant(const Quaternion &p_quat);
 	Variant(const Basis &p_matrix);
 	Variant(const Transform2D &p_transform);
 	Variant(const Transform3D &p_transform);
diff --git a/core/variant/variant_call.cpp b/core/variant/variant_call.cpp
index a93a166d33..72dd888dff 100644
--- a/core/variant/variant_call.cpp
+++ b/core/variant/variant_call.cpp
@@ -1544,19 +1544,19 @@ static void _register_variant_builtin_methods() {
 	bind_methodv(Plane, intersects_ray, &Plane::intersects_ray_bind, sarray("from", "dir"), varray());
 	bind_methodv(Plane, intersects_segment, &Plane::intersects_segment_bind, sarray("from", "to"), varray());
 
-	/* Quat */
-
-	bind_method(Quat, length, sarray(), varray());
-	bind_method(Quat, length_squared, sarray(), varray());
-	bind_method(Quat, normalized, sarray(), varray());
-	bind_method(Quat, is_normalized, sarray(), varray());
-	bind_method(Quat, is_equal_approx, sarray("to"), varray());
-	bind_method(Quat, inverse, sarray(), varray());
-	bind_method(Quat, dot, sarray("with"), varray());
-	bind_method(Quat, slerp, sarray("to", "weight"), varray());
-	bind_method(Quat, slerpni, sarray("to", "weight"), varray());
-	bind_method(Quat, cubic_slerp, sarray("b", "pre_a", "post_b", "weight"), varray());
-	bind_method(Quat, get_euler, sarray(), varray());
+	/* Quaternion */
+
+	bind_method(Quaternion, length, sarray(), varray());
+	bind_method(Quaternion, length_squared, sarray(), varray());
+	bind_method(Quaternion, normalized, sarray(), varray());
+	bind_method(Quaternion, is_normalized, sarray(), varray());
+	bind_method(Quaternion, is_equal_approx, sarray("to"), varray());
+	bind_method(Quaternion, inverse, sarray(), varray());
+	bind_method(Quaternion, dot, sarray("with"), varray());
+	bind_method(Quaternion, slerp, sarray("to", "weight"), varray());
+	bind_method(Quaternion, slerpni, sarray("to", "weight"), varray());
+	bind_method(Quaternion, cubic_slerp, sarray("b", "pre_a", "post_b", "weight"), varray());
+	bind_method(Quaternion, get_euler, sarray(), varray());
 
 	/* Color */
 
@@ -1668,7 +1668,7 @@ static void _register_variant_builtin_methods() {
 	bind_method(Basis, get_orthogonal_index, sarray(), varray());
 	bind_method(Basis, slerp, sarray("to", "weight"), varray());
 	bind_method(Basis, is_equal_approx, sarray("b"), varray());
-	bind_method(Basis, get_rotation_quat, sarray(), varray());
+	bind_method(Basis, get_rotation_quaternion, sarray(), varray());
 
 	/* AABB */
 
@@ -2047,7 +2047,7 @@ static void _register_variant_builtin_methods() {
 	_VariantCall::add_variant_constant(Variant::PLANE, "PLANE_XZ", Plane(Vector3(0, 1, 0), 0));
 	_VariantCall::add_variant_constant(Variant::PLANE, "PLANE_XY", Plane(Vector3(0, 0, 1), 0));
 
-	_VariantCall::add_variant_constant(Variant::QUAT, "IDENTITY", Quat(0, 0, 0, 1));
+	_VariantCall::add_variant_constant(Variant::QUATERNION, "IDENTITY", Quaternion(0, 0, 0, 1));
 }
 
 void Variant::_register_variant_methods() {
diff --git a/core/variant/variant_construct.cpp b/core/variant/variant_construct.cpp
index 699496ce19..f66f33ef93 100644
--- a/core/variant/variant_construct.cpp
+++ b/core/variant/variant_construct.cpp
@@ -62,7 +62,7 @@ MAKE_PTRCONSTRUCT(Vector3);
 MAKE_PTRCONSTRUCT(Vector3i);
 MAKE_PTRCONSTRUCT(Transform2D);
 MAKE_PTRCONSTRUCT(Plane);
-MAKE_PTRCONSTRUCT(Quat);
+MAKE_PTRCONSTRUCT(Quaternion);
 MAKE_PTRCONSTRUCT(AABB);
 MAKE_PTRCONSTRUCT(Basis);
 MAKE_PTRCONSTRUCT(Transform3D);
@@ -659,13 +659,13 @@ void Variant::_register_variant_constructors() {
 	add_constructor<VariantConstructor<Plane, Vector3, Vector3, Vector3>>(sarray("point1", "point2", "point3"));
 	add_constructor<VariantConstructor<Plane, double, double, double, double>>(sarray("a", "b", "c", "d"));
 
-	add_constructor<VariantConstructNoArgs<Quat>>(sarray());
-	add_constructor<VariantConstructor<Quat, Quat>>(sarray("from"));
-	add_constructor<VariantConstructor<Quat, Basis>>(sarray("from"));
-	add_constructor<VariantConstructor<Quat, Vector3>>(sarray("euler"));
-	add_constructor<VariantConstructor<Quat, Vector3, double>>(sarray("axis", "angle"));
-	add_constructor<VariantConstructor<Quat, Vector3, Vector3>>(sarray("arc_from", "arc_to"));
-	add_constructor<VariantConstructor<Quat, double, double, double, double>>(sarray("x", "y", "z", "w"));
+	add_constructor<VariantConstructNoArgs<Quaternion>>(sarray());
+	add_constructor<VariantConstructor<Quaternion, Quaternion>>(sarray("from"));
+	add_constructor<VariantConstructor<Quaternion, Basis>>(sarray("from"));
+	add_constructor<VariantConstructor<Quaternion, Vector3>>(sarray("euler"));
+	add_constructor<VariantConstructor<Quaternion, Vector3, double>>(sarray("axis", "angle"));
+	add_constructor<VariantConstructor<Quaternion, Vector3, Vector3>>(sarray("arc_from", "arc_to"));
+	add_constructor<VariantConstructor<Quaternion, double, double, double, double>>(sarray("x", "y", "z", "w"));
 
 	add_constructor<VariantConstructNoArgs<::AABB>>(sarray());
 	add_constructor<VariantConstructor<::AABB, ::AABB>>(sarray("from"));
@@ -673,7 +673,7 @@ void Variant::_register_variant_constructors() {
 
 	add_constructor<VariantConstructNoArgs<Basis>>(sarray());
 	add_constructor<VariantConstructor<Basis, Basis>>(sarray("from"));
-	add_constructor<VariantConstructor<Basis, Quat>>(sarray("from"));
+	add_constructor<VariantConstructor<Basis, Quaternion>>(sarray("from"));
 	add_constructor<VariantConstructor<Basis, Vector3>>(sarray("euler"));
 	add_constructor<VariantConstructor<Basis, Vector3, double>>(sarray("axis", "phi"));
 	add_constructor<VariantConstructor<Basis, Vector3, Vector3, Vector3>>(sarray("x_axis", "y_axis", "z_axis"));
diff --git a/core/variant/variant_internal.h b/core/variant/variant_internal.h
index 1eaa211b37..9e5811a082 100644
--- a/core/variant/variant_internal.h
+++ b/core/variant/variant_internal.h
@@ -138,8 +138,8 @@ public:
 	_FORCE_INLINE_ static const Transform2D *get_transform2d(const Variant *v) { return v->_data._transform2d; }
 	_FORCE_INLINE_ static Plane *get_plane(Variant *v) { return reinterpret_cast<Plane *>(v->_data._mem); }
 	_FORCE_INLINE_ static const Plane *get_plane(const Variant *v) { return reinterpret_cast<const Plane *>(v->_data._mem); }
-	_FORCE_INLINE_ static Quat *get_quat(Variant *v) { return reinterpret_cast<Quat *>(v->_data._mem); }
-	_FORCE_INLINE_ static const Quat *get_quat(const Variant *v) { return reinterpret_cast<const Quat *>(v->_data._mem); }
+	_FORCE_INLINE_ static Quaternion *get_quaternion(Variant *v) { return reinterpret_cast<Quaternion *>(v->_data._mem); }
+	_FORCE_INLINE_ static const Quaternion *get_quaternion(const Variant *v) { return reinterpret_cast<const Quaternion *>(v->_data._mem); }
 	_FORCE_INLINE_ static ::AABB *get_aabb(Variant *v) { return v->_data._aabb; }
 	_FORCE_INLINE_ static const ::AABB *get_aabb(const Variant *v) { return v->_data._aabb; }
 	_FORCE_INLINE_ static Basis *get_basis(Variant *v) { return v->_data._basis; }
@@ -324,8 +324,8 @@ public:
 				return get_transform(v);
 			case Variant::TRANSFORM2D:
 				return get_transform2d(v);
-			case Variant::QUAT:
-				return get_quat(v);
+			case Variant::QUATERNION:
+				return get_quaternion(v);
 			case Variant::PLANE:
 				return get_plane(v);
 			case Variant::BASIS:
@@ -402,8 +402,8 @@ public:
 				return get_transform(v);
 			case Variant::TRANSFORM2D:
 				return get_transform2d(v);
-			case Variant::QUAT:
-				return get_quat(v);
+			case Variant::QUATERNION:
+				return get_quaternion(v);
 			case Variant::PLANE:
 				return get_plane(v);
 			case Variant::BASIS:
@@ -602,9 +602,9 @@ struct VariantGetInternalPtr<Plane> {
 };
 
 template <>
-struct VariantGetInternalPtr<Quat> {
-	static Quat *get_ptr(Variant *v) { return VariantInternal::get_quat(v); }
-	static const Quat *get_ptr(const Variant *v) { return VariantInternal::get_quat(v); }
+struct VariantGetInternalPtr<Quaternion> {
+	static Quaternion *get_ptr(Variant *v) { return VariantInternal::get_quaternion(v); }
+	static const Quaternion *get_ptr(const Variant *v) { return VariantInternal::get_quaternion(v); }
 };
 
 template <>
@@ -831,9 +831,9 @@ struct VariantInternalAccessor<Plane> {
 };
 
 template <>
-struct VariantInternalAccessor<Quat> {
-	static _FORCE_INLINE_ const Quat &get(const Variant *v) { return *VariantInternal::get_quat(v); }
-	static _FORCE_INLINE_ void set(Variant *v, const Quat &p_value) { *VariantInternal::get_quat(v) = p_value; }
+struct VariantInternalAccessor<Quaternion> {
+	static _FORCE_INLINE_ const Quaternion &get(const Variant *v) { return *VariantInternal::get_quaternion(v); }
+	static _FORCE_INLINE_ void set(Variant *v, const Quaternion &p_value) { *VariantInternal::get_quaternion(v) = p_value; }
 };
 
 template <>
@@ -1067,8 +1067,8 @@ struct VariantInitializer<Plane> {
 };
 
 template <>
-struct VariantInitializer<Quat> {
-	static _FORCE_INLINE_ void init(Variant *v) { VariantInternal::init_generic<Quat>(v); }
+struct VariantInitializer<Quaternion> {
+	static _FORCE_INLINE_ void init(Variant *v) { VariantInternal::init_generic<Quaternion>(v); }
 };
 
 template <>
@@ -1241,8 +1241,8 @@ struct VariantZeroAssigner<Plane> {
 };
 
 template <>
-struct VariantZeroAssigner<Quat> {
-	static _FORCE_INLINE_ void zero(Variant *v) { *VariantInternal::get_quat(v) = Quat(); }
+struct VariantZeroAssigner<Quaternion> {
+	static _FORCE_INLINE_ void zero(Variant *v) { *VariantInternal::get_quaternion(v) = Quaternion(); }
 };
 
 template <>
diff --git a/core/variant/variant_op.cpp b/core/variant/variant_op.cpp
index cce0177e20..10d0a83014 100644
--- a/core/variant/variant_op.cpp
+++ b/core/variant/variant_op.cpp
@@ -1395,7 +1395,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorAdd<Vector2i, Vector2i, Vector2i>>(Variant::OP_ADD, Variant::VECTOR2I, Variant::VECTOR2I);
 	register_op<OperatorEvaluatorAdd<Vector3, Vector3, Vector3>>(Variant::OP_ADD, Variant::VECTOR3, Variant::VECTOR3);
 	register_op<OperatorEvaluatorAdd<Vector3i, Vector3i, Vector3i>>(Variant::OP_ADD, Variant::VECTOR3I, Variant::VECTOR3I);
-	register_op<OperatorEvaluatorAdd<Quat, Quat, Quat>>(Variant::OP_ADD, Variant::QUAT, Variant::QUAT);
+	register_op<OperatorEvaluatorAdd<Quaternion, Quaternion, Quaternion>>(Variant::OP_ADD, Variant::QUATERNION, Variant::QUATERNION);
 	register_op<OperatorEvaluatorAdd<Color, Color, Color>>(Variant::OP_ADD, Variant::COLOR, Variant::COLOR);
 	register_op<OperatorEvaluatorAddArray>(Variant::OP_ADD, Variant::ARRAY, Variant::ARRAY);
 	register_op<OperatorEvaluatorAppendArray<uint8_t>>(Variant::OP_ADD, Variant::PACKED_BYTE_ARRAY, Variant::PACKED_BYTE_ARRAY);
@@ -1416,7 +1416,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorSub<Vector2i, Vector2i, Vector2i>>(Variant::OP_SUBTRACT, Variant::VECTOR2I, Variant::VECTOR2I);
 	register_op<OperatorEvaluatorSub<Vector3, Vector3, Vector3>>(Variant::OP_SUBTRACT, Variant::VECTOR3, Variant::VECTOR3);
 	register_op<OperatorEvaluatorSub<Vector3i, Vector3i, Vector3i>>(Variant::OP_SUBTRACT, Variant::VECTOR3I, Variant::VECTOR3I);
-	register_op<OperatorEvaluatorSub<Quat, Quat, Quat>>(Variant::OP_SUBTRACT, Variant::QUAT, Variant::QUAT);
+	register_op<OperatorEvaluatorSub<Quaternion, Quaternion, Quaternion>>(Variant::OP_SUBTRACT, Variant::QUATERNION, Variant::QUATERNION);
 	register_op<OperatorEvaluatorSub<Color, Color, Color>>(Variant::OP_SUBTRACT, Variant::COLOR, Variant::COLOR);
 
 	register_op<OperatorEvaluatorMul<int64_t, int64_t, int64_t>>(Variant::OP_MULTIPLY, Variant::INT, Variant::INT);
@@ -1449,9 +1449,9 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorMul<Vector3i, Vector3i, int64_t>>(Variant::OP_MULTIPLY, Variant::VECTOR3I, Variant::INT);
 	register_op<OperatorEvaluatorMul<Vector3i, Vector3i, double>>(Variant::OP_MULTIPLY, Variant::VECTOR3I, Variant::FLOAT);
 
-	register_op<OperatorEvaluatorMul<Quat, Quat, Quat>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::QUAT);
-	register_op<OperatorEvaluatorMul<Quat, Quat, int64_t>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::INT);
-	register_op<OperatorEvaluatorMul<Quat, Quat, double>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::FLOAT);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, Quaternion>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::QUATERNION);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, int64_t>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::INT);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, double>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::FLOAT);
 
 	register_op<OperatorEvaluatorMul<Color, Color, Color>>(Variant::OP_MULTIPLY, Variant::COLOR, Variant::COLOR);
 	register_op<OperatorEvaluatorMul<Color, Color, int64_t>>(Variant::OP_MULTIPLY, Variant::COLOR, Variant::INT);
@@ -1477,13 +1477,13 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorXForm<Vector3, Basis, Vector3>>(Variant::OP_MULTIPLY, Variant::BASIS, Variant::VECTOR3);
 	register_op<OperatorEvaluatorXFormInv<Vector3, Vector3, Basis>>(Variant::OP_MULTIPLY, Variant::VECTOR3, Variant::BASIS);
 
-	register_op<OperatorEvaluatorMul<Quat, Quat, Quat>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::QUAT);
-	register_op<OperatorEvaluatorMul<Quat, Quat, int64_t>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::INT);
-	register_op<OperatorEvaluatorMul<Quat, int64_t, Quat>>(Variant::OP_MULTIPLY, Variant::INT, Variant::QUAT);
-	register_op<OperatorEvaluatorMul<Quat, Quat, double>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::FLOAT);
-	register_op<OperatorEvaluatorMul<Quat, double, Quat>>(Variant::OP_MULTIPLY, Variant::FLOAT, Variant::QUAT);
-	register_op<OperatorEvaluatorXForm<Vector3, Quat, Vector3>>(Variant::OP_MULTIPLY, Variant::QUAT, Variant::VECTOR3);
-	register_op<OperatorEvaluatorXFormInv<Vector3, Vector3, Quat>>(Variant::OP_MULTIPLY, Variant::VECTOR3, Variant::QUAT);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, Quaternion>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::QUATERNION);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, int64_t>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::INT);
+	register_op<OperatorEvaluatorMul<Quaternion, int64_t, Quaternion>>(Variant::OP_MULTIPLY, Variant::INT, Variant::QUATERNION);
+	register_op<OperatorEvaluatorMul<Quaternion, Quaternion, double>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::FLOAT);
+	register_op<OperatorEvaluatorMul<Quaternion, double, Quaternion>>(Variant::OP_MULTIPLY, Variant::FLOAT, Variant::QUATERNION);
+	register_op<OperatorEvaluatorXForm<Vector3, Quaternion, Vector3>>(Variant::OP_MULTIPLY, Variant::QUATERNION, Variant::VECTOR3);
+	register_op<OperatorEvaluatorXFormInv<Vector3, Vector3, Quaternion>>(Variant::OP_MULTIPLY, Variant::VECTOR3, Variant::QUATERNION);
 
 	register_op<OperatorEvaluatorMul<Color, Color, Color>>(Variant::OP_MULTIPLY, Variant::COLOR, Variant::COLOR);
 	register_op<OperatorEvaluatorMul<Color, Color, int64_t>>(Variant::OP_MULTIPLY, Variant::COLOR, Variant::INT);
@@ -1516,8 +1516,8 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorDivNZ<Vector3i, Vector3i, double>>(Variant::OP_DIVIDE, Variant::VECTOR3I, Variant::FLOAT);
 	register_op<OperatorEvaluatorDivNZ<Vector3i, Vector3i, int64_t>>(Variant::OP_DIVIDE, Variant::VECTOR3I, Variant::INT);
 
-	register_op<OperatorEvaluatorDiv<Quat, Quat, double>>(Variant::OP_DIVIDE, Variant::QUAT, Variant::FLOAT);
-	register_op<OperatorEvaluatorDiv<Quat, Quat, int64_t>>(Variant::OP_DIVIDE, Variant::QUAT, Variant::INT);
+	register_op<OperatorEvaluatorDiv<Quaternion, Quaternion, double>>(Variant::OP_DIVIDE, Variant::QUATERNION, Variant::FLOAT);
+	register_op<OperatorEvaluatorDiv<Quaternion, Quaternion, int64_t>>(Variant::OP_DIVIDE, Variant::QUATERNION, Variant::INT);
 
 	register_op<OperatorEvaluatorDiv<Color, Color, Color>>(Variant::OP_DIVIDE, Variant::COLOR, Variant::COLOR);
 	register_op<OperatorEvaluatorDiv<Color, Color, double>>(Variant::OP_DIVIDE, Variant::COLOR, Variant::FLOAT);
@@ -1544,7 +1544,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorStringModT<Vector3i>>(Variant::OP_MODULE, Variant::STRING, Variant::VECTOR3I);
 	register_op<OperatorEvaluatorStringModT<Transform2D>>(Variant::OP_MODULE, Variant::STRING, Variant::TRANSFORM2D);
 	register_op<OperatorEvaluatorStringModT<Plane>>(Variant::OP_MODULE, Variant::STRING, Variant::PLANE);
-	register_op<OperatorEvaluatorStringModT<Quat>>(Variant::OP_MODULE, Variant::STRING, Variant::QUAT);
+	register_op<OperatorEvaluatorStringModT<Quaternion>>(Variant::OP_MODULE, Variant::STRING, Variant::QUATERNION);
 	register_op<OperatorEvaluatorStringModT<::AABB>>(Variant::OP_MODULE, Variant::STRING, Variant::AABB);
 	register_op<OperatorEvaluatorStringModT<Basis>>(Variant::OP_MODULE, Variant::STRING, Variant::BASIS);
 	register_op<OperatorEvaluatorStringModT<Transform3D>>(Variant::OP_MODULE, Variant::STRING, Variant::TRANSFORM3D);
@@ -1574,7 +1574,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorNeg<Vector2i, Vector2i>>(Variant::OP_NEGATE, Variant::VECTOR2I, Variant::NIL);
 	register_op<OperatorEvaluatorNeg<Vector3, Vector3>>(Variant::OP_NEGATE, Variant::VECTOR3, Variant::NIL);
 	register_op<OperatorEvaluatorNeg<Vector3i, Vector3i>>(Variant::OP_NEGATE, Variant::VECTOR3I, Variant::NIL);
-	register_op<OperatorEvaluatorNeg<Quat, Quat>>(Variant::OP_NEGATE, Variant::QUAT, Variant::NIL);
+	register_op<OperatorEvaluatorNeg<Quaternion, Quaternion>>(Variant::OP_NEGATE, Variant::QUATERNION, Variant::NIL);
 	register_op<OperatorEvaluatorNeg<Plane, Plane>>(Variant::OP_NEGATE, Variant::PLANE, Variant::NIL);
 	register_op<OperatorEvaluatorNeg<Color, Color>>(Variant::OP_NEGATE, Variant::COLOR, Variant::NIL);
 
@@ -1584,7 +1584,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorPos<Vector2i, Vector2i>>(Variant::OP_POSITIVE, Variant::VECTOR2I, Variant::NIL);
 	register_op<OperatorEvaluatorPos<Vector3, Vector3>>(Variant::OP_POSITIVE, Variant::VECTOR3, Variant::NIL);
 	register_op<OperatorEvaluatorPos<Vector3i, Vector3i>>(Variant::OP_POSITIVE, Variant::VECTOR3I, Variant::NIL);
-	register_op<OperatorEvaluatorPos<Quat, Quat>>(Variant::OP_POSITIVE, Variant::QUAT, Variant::NIL);
+	register_op<OperatorEvaluatorPos<Quaternion, Quaternion>>(Variant::OP_POSITIVE, Variant::QUATERNION, Variant::NIL);
 	register_op<OperatorEvaluatorPos<Plane, Plane>>(Variant::OP_POSITIVE, Variant::PLANE, Variant::NIL);
 	register_op<OperatorEvaluatorPos<Color, Color>>(Variant::OP_POSITIVE, Variant::COLOR, Variant::NIL);
 
@@ -1612,7 +1612,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorEqual<Vector3i, Vector3i>>(Variant::OP_EQUAL, Variant::VECTOR3I, Variant::VECTOR3I);
 	register_op<OperatorEvaluatorEqual<Transform2D, Transform2D>>(Variant::OP_EQUAL, Variant::TRANSFORM2D, Variant::TRANSFORM2D);
 	register_op<OperatorEvaluatorEqual<Plane, Plane>>(Variant::OP_EQUAL, Variant::PLANE, Variant::PLANE);
-	register_op<OperatorEvaluatorEqual<Quat, Quat>>(Variant::OP_EQUAL, Variant::QUAT, Variant::QUAT);
+	register_op<OperatorEvaluatorEqual<Quaternion, Quaternion>>(Variant::OP_EQUAL, Variant::QUATERNION, Variant::QUATERNION);
 	register_op<OperatorEvaluatorEqual<::AABB, ::AABB>>(Variant::OP_EQUAL, Variant::AABB, Variant::AABB);
 	register_op<OperatorEvaluatorEqual<Basis, Basis>>(Variant::OP_EQUAL, Variant::BASIS, Variant::BASIS);
 	register_op<OperatorEvaluatorEqual<Transform3D, Transform3D>>(Variant::OP_EQUAL, Variant::TRANSFORM3D, Variant::TRANSFORM3D);
@@ -1658,7 +1658,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorNotEqual<Vector3i, Vector3i>>(Variant::OP_NOT_EQUAL, Variant::VECTOR3I, Variant::VECTOR3I);
 	register_op<OperatorEvaluatorNotEqual<Transform2D, Transform2D>>(Variant::OP_NOT_EQUAL, Variant::TRANSFORM2D, Variant::TRANSFORM2D);
 	register_op<OperatorEvaluatorNotEqual<Plane, Plane>>(Variant::OP_NOT_EQUAL, Variant::PLANE, Variant::PLANE);
-	register_op<OperatorEvaluatorNotEqual<Quat, Quat>>(Variant::OP_NOT_EQUAL, Variant::QUAT, Variant::QUAT);
+	register_op<OperatorEvaluatorNotEqual<Quaternion, Quaternion>>(Variant::OP_NOT_EQUAL, Variant::QUATERNION, Variant::QUATERNION);
 	register_op<OperatorEvaluatorNotEqual<::AABB, ::AABB>>(Variant::OP_NOT_EQUAL, Variant::AABB, Variant::AABB);
 	register_op<OperatorEvaluatorNotEqual<Basis, Basis>>(Variant::OP_NOT_EQUAL, Variant::BASIS, Variant::BASIS);
 	register_op<OperatorEvaluatorNotEqual<Transform3D, Transform3D>>(Variant::OP_NOT_EQUAL, Variant::TRANSFORM3D, Variant::TRANSFORM3D);
@@ -1849,7 +1849,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorInDictionaryHas<Vector3i>>(Variant::OP_IN, Variant::VECTOR3I, Variant::DICTIONARY);
 	register_op<OperatorEvaluatorInDictionaryHas<Transform2D>>(Variant::OP_IN, Variant::TRANSFORM2D, Variant::DICTIONARY);
 	register_op<OperatorEvaluatorInDictionaryHas<Plane>>(Variant::OP_IN, Variant::PLANE, Variant::DICTIONARY);
-	register_op<OperatorEvaluatorInDictionaryHas<Quat>>(Variant::OP_IN, Variant::QUAT, Variant::DICTIONARY);
+	register_op<OperatorEvaluatorInDictionaryHas<Quaternion>>(Variant::OP_IN, Variant::QUATERNION, Variant::DICTIONARY);
 	register_op<OperatorEvaluatorInDictionaryHas<::AABB>>(Variant::OP_IN, Variant::AABB, Variant::DICTIONARY);
 	register_op<OperatorEvaluatorInDictionaryHas<Basis>>(Variant::OP_IN, Variant::BASIS, Variant::DICTIONARY);
 	register_op<OperatorEvaluatorInDictionaryHas<Transform3D>>(Variant::OP_IN, Variant::TRANSFORM3D, Variant::DICTIONARY);
@@ -1886,7 +1886,7 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorInArrayFind<Vector3i, Array>>(Variant::OP_IN, Variant::VECTOR3I, Variant::ARRAY);
 	register_op<OperatorEvaluatorInArrayFind<Transform2D, Array>>(Variant::OP_IN, Variant::TRANSFORM2D, Variant::ARRAY);
 	register_op<OperatorEvaluatorInArrayFind<Plane, Array>>(Variant::OP_IN, Variant::PLANE, Variant::ARRAY);
-	register_op<OperatorEvaluatorInArrayFind<Quat, Array>>(Variant::OP_IN, Variant::QUAT, Variant::ARRAY);
+	register_op<OperatorEvaluatorInArrayFind<Quaternion, Array>>(Variant::OP_IN, Variant::QUATERNION, Variant::ARRAY);
 	register_op<OperatorEvaluatorInArrayFind<::AABB, Array>>(Variant::OP_IN, Variant::AABB, Variant::ARRAY);
 	register_op<OperatorEvaluatorInArrayFind<Basis, Array>>(Variant::OP_IN, Variant::BASIS, Variant::ARRAY);
 	register_op<OperatorEvaluatorInArrayFind<Transform3D, Array>>(Variant::OP_IN, Variant::TRANSFORM3D, Variant::ARRAY);
diff --git a/core/variant/variant_parser.cpp b/core/variant/variant_parser.cpp
index 62643e1d31..b58f60c149 100644
--- a/core/variant/variant_parser.cpp
+++ b/core/variant/variant_parser.cpp
@@ -614,7 +614,7 @@ Error VariantParser::parse_value(Token &token, Variant &value, Stream *p_stream,
 			}
 
 			value = Plane(args[0], args[1], args[2], args[3]);
-		} else if (id == "Quat") {
+		} else if (id == "Quaternion" || id == "Quat") { // "Quat" kept for compatibility
 			Vector<real_t> args;
 			Error err = _parse_construct<real_t>(p_stream, args, line, r_err_str);
 			if (err) {
@@ -626,7 +626,7 @@ Error VariantParser::parse_value(Token &token, Variant &value, Stream *p_stream,
 				return ERR_PARSE_ERROR;
 			}
 
-			value = Quat(args[0], args[1], args[2], args[3]);
+			value = Quaternion(args[0], args[1], args[2], args[3]);
 		} else if (id == "AABB" || id == "Rect3") {
 			Vector<real_t> args;
 			Error err = _parse_construct<real_t>(p_stream, args, line, r_err_str);
@@ -1454,9 +1454,9 @@ Error VariantWriter::write(const Variant &p_variant, StoreStringFunc p_store_str
 			p_store_string_func(p_store_string_ud, "AABB( " + rtosfix(aabb.position.x) + ", " + rtosfix(aabb.position.y) + ", " + rtosfix(aabb.position.z) + ", " + rtosfix(aabb.size.x) + ", " + rtosfix(aabb.size.y) + ", " + rtosfix(aabb.size.z) + " )");
 
 		} break;
-		case Variant::QUAT: {
-			Quat quat = p_variant;
-			p_store_string_func(p_store_string_ud, "Quat( " + rtosfix(quat.x) + ", " + rtosfix(quat.y) + ", " + rtosfix(quat.z) + ", " + rtosfix(quat.w) + " )");
+		case Variant::QUATERNION: {
+			Quaternion quaternion = p_variant;
+			p_store_string_func(p_store_string_ud, "Quaternion( " + rtosfix(quaternion.x) + ", " + rtosfix(quaternion.y) + ", " + rtosfix(quaternion.z) + ", " + rtosfix(quaternion.w) + " )");
 
 		} break;
 		case Variant::TRANSFORM2D: {
diff --git a/core/variant/variant_setget.cpp b/core/variant/variant_setget.cpp
index c3f667d9a7..4f4a80e807 100644
--- a/core/variant/variant_setget.cpp
+++ b/core/variant/variant_setget.cpp
@@ -279,10 +279,10 @@ SETGET_NUMBER_STRUCT_CUSTOM(Plane, double, z, normal.z)
 SETGET_STRUCT(Plane, Vector3, normal)
 SETGET_NUMBER_STRUCT(Plane, double, d)
 
-SETGET_NUMBER_STRUCT(Quat, double, x)
-SETGET_NUMBER_STRUCT(Quat, double, y)
-SETGET_NUMBER_STRUCT(Quat, double, z)
-SETGET_NUMBER_STRUCT(Quat, double, w)
+SETGET_NUMBER_STRUCT(Quaternion, double, x)
+SETGET_NUMBER_STRUCT(Quaternion, double, y)
+SETGET_NUMBER_STRUCT(Quaternion, double, z)
+SETGET_NUMBER_STRUCT(Quaternion, double, w)
 
 SETGET_STRUCT_FUNC_INDEX(Basis, Vector3, x, set_axis, get_axis, 0)
 SETGET_STRUCT_FUNC_INDEX(Basis, Vector3, y, set_axis, get_axis, 1)
@@ -374,10 +374,10 @@ void register_named_setters_getters() {
 	REGISTER_MEMBER(Plane, d);
 	REGISTER_MEMBER(Plane, normal);
 
-	REGISTER_MEMBER(Quat, x);
-	REGISTER_MEMBER(Quat, y);
-	REGISTER_MEMBER(Quat, z);
-	REGISTER_MEMBER(Quat, w);
+	REGISTER_MEMBER(Quaternion, x);
+	REGISTER_MEMBER(Quaternion, y);
+	REGISTER_MEMBER(Quaternion, z);
+	REGISTER_MEMBER(Quaternion, w);
 
 	REGISTER_MEMBER(Basis, x);
 	REGISTER_MEMBER(Basis, y);
@@ -975,7 +975,7 @@ INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Vector2, double, real_t, 2)
 INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Vector2i, int64_t, int32_t, 2)
 INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Vector3, double, real_t, 3)
 INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Vector3i, int64_t, int32_t, 3)
-INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Quat, double, real_t, 4)
+INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Quaternion, double, real_t, 4)
 INDEXED_SETGET_STRUCT_BULTIN_NUMERIC(Color, double, float, 4)
 
 INDEXED_SETGET_STRUCT_BULTIN_ACCESSOR(Transform2D, Vector2, .elements, 3)
@@ -1037,7 +1037,7 @@ void register_indexed_setters_getters() {
 	REGISTER_INDEXED_MEMBER(Vector2i);
 	REGISTER_INDEXED_MEMBER(Vector3);
 	REGISTER_INDEXED_MEMBER(Vector3i);
-	REGISTER_INDEXED_MEMBER(Quat);
+	REGISTER_INDEXED_MEMBER(Quaternion);
 	REGISTER_INDEXED_MEMBER(Color);
 	REGISTER_INDEXED_MEMBER(Transform2D);
 	REGISTER_INDEXED_MEMBER(Basis);
@@ -2135,10 +2135,10 @@ void Variant::blend(const Variant &a, const Variant &b, float c, Variant &r_dst)
 			r_dst = ::AABB(ra->position + rb->position * c, ra->size + rb->size * c);
 		}
 			return;
-		case QUAT: {
-			Quat empty_rot;
-			const Quat *qa = reinterpret_cast<const Quat *>(a._data._mem);
-			const Quat *qb = reinterpret_cast<const Quat *>(b._data._mem);
+		case QUATERNION: {
+			Quaternion empty_rot;
+			const Quaternion *qa = reinterpret_cast<const Quaternion *>(a._data._mem);
+			const Quaternion *qb = reinterpret_cast<const Quaternion *>(b._data._mem);
 			r_dst = *qa * empty_rot.slerp(*qb, c);
 		}
 			return;
@@ -2295,8 +2295,8 @@ void Variant::interpolate(const Variant &a, const Variant &b, float c, Variant &
 			r_dst = a;
 		}
 			return;
-		case QUAT: {
-			r_dst = reinterpret_cast<const Quat *>(a._data._mem)->slerp(*reinterpret_cast<const Quat *>(b._data._mem), c);
+		case QUATERNION: {
+			r_dst = reinterpret_cast<const Quaternion *>(a._data._mem)->slerp(*reinterpret_cast<const Quaternion *>(b._data._mem), c);
 		}
 			return;
 		case AABB: {