Merge pull request #93852 from lawnjelly/fti_fix_interpolate_transform2D

Physics Interpolation - Fix `interpolated_transform_2d`

core/math/transform_interpolator.cpp

@@ -33,44 +33,14 @@
 #include "core/math/transform_2d.h"
 
 void TransformInterpolator::interpolate_transform_2d(const Transform2D &p_prev, const Transform2D &p_curr, Transform2D &r_result, real_t p_fraction) {
- // Extract parameters.
- Vector2 p1 = p_prev.get_origin();
- Vector2 p2 = p_curr.get_origin();
-
  // Special case for physics interpolation, if flipping, don't interpolate basis.
  // If the determinant polarity changes, the handedness of the coordinate system changes.
  if (_sign(p_prev.determinant()) != _sign(p_curr.determinant())) {
  r_result.columns[0] = p_curr.columns[0];
  r_result.columns[1] = p_curr.columns[1];
- r_result.set_origin(p1.lerp(p2, p_fraction));
+ r_result.set_origin(p_prev.get_origin().lerp(p_curr.get_origin(), p_fraction));
  return;
  }
 
- real_t r1 = p_prev.get_rotation();
- real_t r2 = p_curr.get_rotation();
-
- Size2 s1 = p_prev.get_scale();
- Size2 s2 = p_curr.get_scale();
-
- // Slerp rotation.
- Vector2 v1(Math::cos(r1), Math::sin(r1));
- Vector2 v2(Math::cos(r2), Math::sin(r2));
-
- real_t dot = v1.dot(v2);
-
- dot = CLAMP(dot, -1, 1);
-
- Vector2 v;
-
- if (dot > 0.9995f) {
- v = v1.lerp(v2, p_fraction).normalized(); // Linearly interpolate to avoid numerical precision issues.
- } else {
- real_t angle = p_fraction * Math::acos(dot);
- Vector2 v3 = (v2 - v1 * dot).normalized();
- v = v1 * Math::cos(angle) + v3 * Math::sin(angle);
- }
-
- // Construct matrix.
- r_result = Transform2D(Math::atan2(v.y, v.x), p1.lerp(p2, p_fraction));
- r_result.scale_basis(s1.lerp(s2, p_fraction));
+ r_result = p_prev.interpolate_with(p_curr, p_fraction);
 }