diff options
Diffstat (limited to 'core/math/basis.cpp')
| -rw-r--r-- | core/math/basis.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/core/math/basis.cpp b/core/math/basis.cpp index aa3831d4cf..5c42213e61 100644 --- a/core/math/basis.cpp +++ b/core/math/basis.cpp @@ -381,6 +381,18 @@ Quaternion Basis::get_rotation_quaternion() const { return m.get_quaternion(); } +void Basis::rotate_to_align(Vector3 p_start_direction, Vector3 p_end_direction) { + // Takes two vectors and rotates the basis from the first vector to the second vector. + // Adopted from: https://gist.github.com/kevinmoran/b45980723e53edeb8a5a43c49f134724 + const Vector3 axis = p_start_direction.cross(p_end_direction).normalized(); + if (axis.length_squared() != 0) { + real_t dot = p_start_direction.dot(p_end_direction); + dot = CLAMP(dot, -1.0, 1.0); + const real_t angle_rads = Math::acos(dot); + set_axis_angle(axis, angle_rads); + } +} + void Basis::get_rotation_axis_angle(Vector3 &p_axis, real_t &p_angle) 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(). @@ -1129,3 +1141,21 @@ void Basis::rotate_sh(real_t *p_values) { p_values[7] = -d3; p_values[8] = d4 * s_scale_dst4; } + +Basis Basis::looking_at(const Vector3 &p_target, const Vector3 &p_up) { +#ifdef MATH_CHECKS + ERR_FAIL_COND_V_MSG(p_target.is_equal_approx(Vector3()), Basis(), "The target vector can't be zero."); + ERR_FAIL_COND_V_MSG(p_up.is_equal_approx(Vector3()), Basis(), "The up vector can't be zero."); +#endif + Vector3 v_z = -p_target.normalized(); + Vector3 v_x = p_up.cross(v_z); +#ifdef MATH_CHECKS + ERR_FAIL_COND_V_MSG(v_x.is_equal_approx(Vector3()), Basis(), "The target vector and up vector can't be parallel to each other."); +#endif + v_x.normalize(); + Vector3 v_y = v_z.cross(v_x); + + Basis basis; + basis.set(v_x, v_y, v_z); + return basis; +} |