Curves: move curves surface transforms to blenkernel

This utility struct is useful outside of sculpting code as well.

1 files changed, 14 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/curves.cc b/source/blender/blenkernel/intern/curves.cc
index 7ad83263b73..78791b55b4d 100644
--- a/source/blender/blenkernel/intern/curves.cc
+++ b/source/blender/blenkernel/intern/curves.cc
@@ -388,4 +388,18 @@ Curves *curves_new_nomain(CurvesGeometry curves)
   return curves_id;
 }
 
+CurvesSurfaceTransforms::CurvesSurfaceTransforms(const Object &curves_ob, const Object *surface_ob)
+{
+  this->curves_to_world = curves_ob.obmat;
+  this->world_to_curves = this->curves_to_world.inverted();
+
+  if (surface_ob != nullptr) {
+    this->surface_to_world = surface_ob->obmat;
+    this->world_to_surface = this->surface_to_world.inverted();
+    this->surface_to_curves = this->world_to_curves * this->surface_to_world;
+    this->curves_to_surface = this->world_to_surface * this->curves_to_world;
+    this->surface_to_curves_normal = this->surface_to_curves.inverted().transposed();
+  }
+}
+
 }  // namespace blender::bke