summaryrefslogtreecommitdiff
path: root/scene/resources/curve.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'scene/resources/curve.cpp')
-rw-r--r--scene/resources/curve.cpp245
1 files changed, 120 insertions, 125 deletions
diff --git a/scene/resources/curve.cpp b/scene/resources/curve.cpp
index 0c36abc148..9289c5da4a 100644
--- a/scene/resources/curve.cpp
+++ b/scene/resources/curve.cpp
@@ -1403,6 +1403,22 @@ void Curve3D::_bake_segment3d(RBMap<real_t, Vector3> &r_bake, real_t p_begin, re
}
}
+void Curve3D::_bake_segment3d_even_length(RBMap<real_t, Vector3> &r_bake, real_t p_begin, real_t p_end, const Vector3 &p_a, const Vector3 &p_out, const Vector3 &p_b, const Vector3 &p_in, int p_depth, int p_max_depth, real_t p_length) const {
+ Vector3 beg = p_a.bezier_interpolate(p_a + p_out, p_b + p_in, p_b, p_begin);
+ Vector3 end = p_a.bezier_interpolate(p_a + p_out, p_b + p_in, p_b, p_end);
+
+ size_t length = beg.distance_to(end);
+
+ if (length > p_length && p_depth < p_max_depth) {
+ real_t mp = (p_begin + p_end) * 0.5;
+ Vector3 mid = p_a.bezier_interpolate(p_a + p_out, p_b + p_in, p_b, mp);
+ r_bake[mp] = mid;
+
+ _bake_segment3d(r_bake, p_begin, mp, p_a, p_out, p_b, p_in, p_depth + 1, p_max_depth, p_length);
+ _bake_segment3d(r_bake, mp, p_end, p_a, p_out, p_b, p_in, p_depth + 1, p_max_depth, p_length);
+ }
+}
+
void Curve3D::_bake() const {
if (!baked_cache_dirty) {
return;
@@ -1416,6 +1432,7 @@ void Curve3D::_bake() const {
baked_tilt_cache.clear();
baked_dist_cache.clear();
+ baked_forward_vector_cache.clear();
baked_up_vector_cache.clear();
return;
}
@@ -1427,10 +1444,12 @@ void Curve3D::_bake() const {
baked_tilt_cache.set(0, points[0].tilt);
baked_dist_cache.resize(1);
baked_dist_cache.set(0, 0.0);
+ baked_forward_vector_cache.resize(1);
+ baked_forward_vector_cache.set(0, Vector3(0.0, 0.0, 1.0));
if (up_vector_enabled) {
baked_up_vector_cache.resize(1);
- baked_up_vector_cache.set(0, Vector3(0, 1, 0));
+ baked_up_vector_cache.set(0, Vector3(0.0, 1.0, 0.0));
} else {
baked_up_vector_cache.clear();
}
@@ -1438,101 +1457,52 @@ void Curve3D::_bake() const {
return;
}
- Vector3 position = points[0].position;
- real_t dist = 0.0;
- List<Plane> pointlist; // Abuse Plane for (position, dist)
- List<real_t> distlist;
-
- // Start always from origin.
- pointlist.push_back(Plane(position, points[0].tilt));
- distlist.push_back(0.0);
-
- // Step 1: Sample points
- const real_t step = 0.1; // At least 10 substeps ought to be enough?
- for (int i = 0; i < points.size() - 1; i++) {
- real_t p = 0.0;
-
- while (p < 1.0) {
- real_t np = p + step;
- if (np > 1.0) {
- np = 1.0;
- }
-
- Vector3 npp = points[i].position.bezier_interpolate(points[i].position + points[i].out, points[i + 1].position + points[i + 1].in, points[i + 1].position, np);
- real_t d = position.distance_to(npp);
-
- if (d > bake_interval) {
- // OK! between P and NP there _has_ to be Something, let's go searching!
-
- const int iterations = 10; // Lots of detail!
-
- real_t low = p;
- real_t hi = np;
- real_t mid = low + (hi - low) * 0.5;
-
- for (int j = 0; j < iterations; j++) {
- npp = points[i].position.bezier_interpolate(points[i].position + points[i].out, points[i + 1].position + points[i + 1].in, points[i + 1].position, mid);
- d = position.distance_to(npp);
-
- if (bake_interval < d) {
- hi = mid;
- } else {
- low = mid;
- }
- mid = low + (hi - low) * 0.5;
- }
-
- position = npp;
- p = mid;
- Plane post;
- post.normal = position;
- post.d = Math::lerp(points[i].tilt, points[i + 1].tilt, mid);
- dist += d;
+ // Step 1: Tesselate curve to (almost) even length segments
+ {
+ Vector<RBMap<real_t, Vector3>> midpoints = _tessellate_even_length(10, bake_interval);
- pointlist.push_back(post);
- distlist.push_back(dist);
- } else {
- p = np;
- }
+ int pc = 1;
+ for (int i = 0; i < points.size() - 1; i++) {
+ pc++;
+ pc += midpoints[i].size();
}
- Vector3 npp = points[i + 1].position;
- real_t d = position.distance_to(npp);
-
- if (d > CMP_EPSILON) { // Avoid the degenerate case of two very close points.
- position = npp;
- Plane post;
- post.normal = position;
- post.d = points[i + 1].tilt;
-
- dist += d;
+ baked_point_cache.resize(pc);
+ baked_tilt_cache.resize(pc);
+ baked_dist_cache.resize(pc);
+ baked_forward_vector_cache.resize(pc);
+
+ Vector3 *bpw = baked_point_cache.ptrw();
+ real_t *btw = baked_tilt_cache.ptrw();
+ Vector3 *bfw = baked_forward_vector_cache.ptrw();
+
+ // Collect positions and sample tilts and tangents for each baked points.
+ bpw[0] = points[0].position;
+ bfw[0] = points[0].position.bezier_derivative(points[0].position + points[0].out, points[1].position + points[1].in, points[1].position, 0.0).normalized();
+ btw[0] = points[0].tilt;
+ int pidx = 0;
+
+ for (int i = 0; i < points.size() - 1; i++) {
+ for (const KeyValue<real_t, Vector3> &E : midpoints[i]) {
+ pidx++;
+ bpw[pidx] = E.value;
+ bfw[pidx] = points[i].position.bezier_derivative(points[i].position + points[i].out, points[i + 1].position + points[i + 1].in, points[i + 1].position, E.key).normalized();
+ btw[pidx] = Math::lerp(points[i].tilt, points[i + 1].tilt, E.key);
+ }
- pointlist.push_back(post);
- distlist.push_back(dist);
+ pidx++;
+ bpw[pidx] = points[i + 1].position;
+ bfw[pidx] = points[i].position.bezier_derivative(points[i].position + points[i].out, points[i + 1].position + points[i + 1].in, points[i + 1].position, 1.0).normalized();
+ btw[pidx] = points[i + 1].tilt;
}
- }
-
- baked_max_ofs = dist;
-
- const int point_count = pointlist.size();
- {
- baked_point_cache.resize(point_count);
- Vector3 *w = baked_point_cache.ptrw();
-
- baked_tilt_cache.resize(point_count);
- real_t *wt = baked_tilt_cache.ptrw();
-
- baked_dist_cache.resize(point_count);
- real_t *wd = baked_dist_cache.ptrw();
-
- int idx = 0;
- for (const Plane &E : pointlist) {
- w[idx] = E.normal;
- wt[idx] = E.d;
- wd[idx] = distlist[idx];
- idx++;
+ // Recalculate the baked distances.
+ real_t *bdw = baked_dist_cache.ptrw();
+ bdw[0] = 0.0;
+ for (int i = 0; i < pc - 1; i++) {
+ bdw[i + 1] = bdw[i] + bpw[i].distance_to(bpw[i + 1]);
}
+ baked_max_ofs = bdw[pc - 1];
}
if (!up_vector_enabled) {
@@ -1545,14 +1515,12 @@ void Curve3D::_bake() const {
// See Dougan, Carl. "The parallel transport frame." Game Programming Gems 2 (2001): 215-219.
// for an example discussing about why not the Frenet frame.
{
- PackedVector3Array forward_vectors;
+ int point_count = baked_point_cache.size();
baked_up_vector_cache.resize(point_count);
- forward_vectors.resize(point_count);
-
Vector3 *up_write = baked_up_vector_cache.ptrw();
- Vector3 *forward_write = forward_vectors.ptrw();
+ const Vector3 *forward_ptr = baked_forward_vector_cache.ptr();
const Vector3 *points_ptr = baked_point_cache.ptr();
Basis frame; // X-right, Y-up, Z-forward.
@@ -1560,28 +1528,20 @@ void Curve3D::_bake() const {
// Set the initial frame based on Y-up rule.
{
- Vector3 up(0, 1, 0);
- Vector3 forward = (points_ptr[1] - points_ptr[0]).normalized();
- if (forward.is_equal_approx(Vector3())) {
- forward = Vector3(1, 0, 0);
- }
+ Vector3 forward = forward_ptr[0];
- if (abs(forward.dot(up)) > 1.0 - UNIT_EPSILON) {
- frame_prev = Basis::looking_at(-forward, up);
- } else {
+ if (abs(forward.dot(Vector3(0, 1, 0))) > 1.0 - UNIT_EPSILON) {
frame_prev = Basis::looking_at(-forward, Vector3(1, 0, 0));
+ } else {
+ frame_prev = Basis::looking_at(-forward, Vector3(0, 1, 0));
}
up_write[0] = frame_prev.get_column(1);
- forward_write[0] = frame_prev.get_column(2);
}
// Calculate the Parallel Transport Frame.
for (int idx = 1; idx < point_count; idx++) {
- Vector3 forward = (points_ptr[idx] - points_ptr[idx - 1]).normalized();
- if (forward.is_equal_approx(Vector3())) {
- forward = frame_prev.get_column(2);
- }
+ Vector3 forward = forward_ptr[idx];
Basis rotate;
rotate.rotate_to_align(frame_prev.get_column(2), forward);
@@ -1589,8 +1549,6 @@ void Curve3D::_bake() const {
frame.orthonormalize(); // guard against float error accumulation
up_write[idx] = frame.get_column(1);
- forward_write[idx] = frame.get_column(2);
-
frame_prev = frame;
}
@@ -1601,8 +1559,8 @@ void Curve3D::_bake() const {
is_loop = false;
}
- real_t dot = forward_write[0].dot(forward_write[point_count - 1]);
- if (dot < 1.0 - 0.01) { // Alignment should not be too tight, or it dosen't work for coarse bake interval
+ real_t dot = forward_ptr[0].dot(forward_ptr[point_count - 1]);
+ if (dot < 1.0 - UNIT_EPSILON) { // Alignment should not be too tight, or it dosen't work for coarse bake interval.
is_loop = false;
}
}
@@ -1612,17 +1570,17 @@ void Curve3D::_bake() const {
const Vector3 up_start = up_write[0];
const Vector3 up_end = up_write[point_count - 1];
- real_t sign = SIGN(up_end.cross(up_start).dot(forward_write[0]));
+ real_t sign = SIGN(up_end.cross(up_start).dot(forward_ptr[0]));
real_t full_angle = Quaternion(up_end, up_start).get_angle();
- if (abs(full_angle) < UNIT_EPSILON) {
+ if (abs(full_angle) < CMP_EPSILON) {
return;
} else {
const real_t *dists = baked_dist_cache.ptr();
for (int idx = 1; idx < point_count; idx++) {
const real_t frac = dists[idx] / baked_max_ofs;
const real_t angle = Math::lerp((real_t)0.0, full_angle, frac);
- Basis twist(forward_write[idx] * sign, angle);
+ Basis twist(forward_ptr[idx] * sign, angle);
up_write[idx] = twist.xform(up_write[idx]);
}
@@ -1720,22 +1678,14 @@ Basis Curve3D::_sample_posture(Interval p_interval, bool p_apply_tilt) const {
int idx = p_interval.idx;
real_t frac = p_interval.frac;
- Vector3 forward_begin;
- Vector3 forward_end;
- if (idx == 0) {
- forward_begin = (baked_point_cache[1] - baked_point_cache[0]).normalized();
- forward_end = (baked_point_cache[1] - baked_point_cache[0]).normalized();
- } else {
- forward_begin = (baked_point_cache[idx] - baked_point_cache[idx - 1]).normalized();
- forward_end = (baked_point_cache[idx + 1] - baked_point_cache[idx]).normalized();
- }
+ Vector3 forward_begin = baked_forward_vector_cache[idx];
+ Vector3 forward_end = baked_forward_vector_cache[idx + 1];
Vector3 up_begin;
Vector3 up_end;
if (up_vector_enabled) {
- const Vector3 *up_ptr = baked_up_vector_cache.ptr();
- up_begin = up_ptr[idx];
- up_end = up_ptr[idx + 1];
+ up_begin = baked_up_vector_cache[idx];
+ up_end = baked_up_vector_cache[idx + 1];
} else {
up_begin = Vector3(0.0, 1.0, 0.0);
up_end = Vector3(0.0, 1.0, 0.0);
@@ -2046,6 +1996,50 @@ PackedVector3Array Curve3D::tessellate(int p_max_stages, real_t p_tolerance) con
return tess;
}
+Vector<RBMap<real_t, Vector3>> Curve3D::_tessellate_even_length(int p_max_stages, real_t p_length) const {
+ Vector<RBMap<real_t, Vector3>> midpoints;
+ ERR_FAIL_COND_V_MSG(points.size() < 2, midpoints, "Curve must have at least 2 control point");
+
+ midpoints.resize(points.size() - 1);
+
+ for (int i = 0; i < points.size() - 1; i++) {
+ _bake_segment3d_even_length(midpoints.write[i], 0, 1, points[i].position, points[i].out, points[i + 1].position, points[i + 1].in, 0, p_max_stages, p_length);
+ }
+ return midpoints;
+}
+
+PackedVector3Array Curve3D::tessellate_even_length(int p_max_stages, real_t p_length) const {
+ PackedVector3Array tess;
+
+ Vector<RBMap<real_t, Vector3>> midpoints = _tessellate_even_length(p_max_stages, p_length);
+ if (midpoints.size() == 0) {
+ return tess;
+ }
+
+ int pc = 1;
+ for (int i = 0; i < points.size() - 1; i++) {
+ pc++;
+ pc += midpoints[i].size();
+ }
+
+ tess.resize(pc);
+ Vector3 *bpw = tess.ptrw();
+ bpw[0] = points[0].position;
+ int pidx = 0;
+
+ for (int i = 0; i < points.size() - 1; i++) {
+ for (const KeyValue<real_t, Vector3> &E : midpoints[i]) {
+ pidx++;
+ bpw[pidx] = E.value;
+ }
+
+ pidx++;
+ bpw[pidx] = points[i + 1].position;
+ }
+
+ return tess;
+}
+
bool Curve3D::_set(const StringName &p_name, const Variant &p_value) {
Vector<String> components = String(p_name).split("/", true, 2);
if (components.size() >= 2 && components[0].begins_with("point_") && components[0].trim_prefix("point_").is_valid_int()) {
@@ -2146,6 +2140,7 @@ void Curve3D::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_closest_point", "to_point"), &Curve3D::get_closest_point);
ClassDB::bind_method(D_METHOD("get_closest_offset", "to_point"), &Curve3D::get_closest_offset);
ClassDB::bind_method(D_METHOD("tessellate", "max_stages", "tolerance_degrees"), &Curve3D::tessellate, DEFVAL(5), DEFVAL(4));
+ ClassDB::bind_method(D_METHOD("tessellate_even_length", "max_stages", "tolerance_length"), &Curve3D::tessellate_even_length, DEFVAL(5), DEFVAL(0.2));
ClassDB::bind_method(D_METHOD("_get_data"), &Curve3D::_get_data);
ClassDB::bind_method(D_METHOD("_set_data", "data"), &Curve3D::_set_data);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 08:45:20 +0000