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Fix Curve3D baking up vectors for nontrivial curves.

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The code was modified in 42aa539 to have a different basis vector, but
this line was missed and caused up vectors to invert sometimes.

Fixes #81879
This commit is contained in:
Ryan Hitchman 2023-09-18 16:30:04 -06:00
parent e3e2528ba7
commit 734b9d2379
2 changed files with 10 additions and 2 deletions
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4
scene/resources/curve.cpp
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@ -1662,7 +1662,7 @@ void Curve3D::_bake() const {
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.
Basis frame; // X-right, Y-up, -Z-forward.
Basis frame_prev;
// Set the initial frame based on Y-up rule.
@ -1683,7 +1683,7 @@ void Curve3D::_bake() const {
Vector3 forward = forward_ptr[idx];
Basis rotate;
rotate.rotate_to_align(frame_prev.get_column(2), forward);
rotate.rotate_to_align(-frame_prev.get_column(2), forward);
frame = rotate * frame_prev;
frame.orthonormalize(); // guard against float error accumulation

8
tests/scene/test_curve_3d.h
View file

@ -209,6 +209,14 @@ TEST_CASE("[Curve3D] Sampling") {
CHECK(curve->get_closest_point(Vector3(50, 50, 0)) == Vector3(0, 50, 0));
CHECK(curve->get_closest_point(Vector3(0, 100, 0)) == Vector3(0, 50, 0));
}
SUBCASE("sample_baked_up_vector, off-axis") {
// Regression test for issue #81879
Ref<Curve3D> c = memnew(Curve3D);
c->add_point(Vector3());
c->add_point(Vector3(0, .1, 1));
CHECK_LT((c->sample_baked_up_vector(c->get_closest_offset(Vector3(0, 0, .9))) - Vector3(0, 0.995037, -0.099504)).length(), 0.01);
}
}
TEST_CASE("[Curve3D] Tessellation") {