Curves: support sculpting on deformed curves

Previously, curves sculpt tools only worked on original data. This was
very limiting, because one could effectively only sculpt the curves when
all procedural effects were turned off. This patch adds support for curves
sculpting while looking the result of procedural effects (like deformation
based on the surface mesh). This functionality is also known as "crazy space"
support in Blender.

For more details see D15407.

Differential Revision: https://developer.blender.org/D15407

1 files changed, 23 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_kdopbvh.h b/source/blender/blenlib/BLI_kdopbvh.h
index 8642d728909..17759b6a8ac 100644
--- a/source/blender/blenlib/BLI_kdopbvh.h
+++ b/source/blender/blenlib/BLI_kdopbvh.h
@@ -332,6 +332,29 @@ extern const float bvhtree_kdop_axes[13][3];
 
 namespace blender {
 
+using BVHTree_RayCastCallback_CPP =
+    FunctionRef<void(int index, const BVHTreeRay &ray, BVHTreeRayHit &hit)>;
+
+inline void BLI_bvhtree_ray_cast_all_cpp(BVHTree &tree,
+                                         const float3 co,
+                                         const float3 dir,
+                                         float radius,
+                                         float hit_dist,
+                                         BVHTree_RayCastCallback_CPP fn)
+{
+  BLI_bvhtree_ray_cast_all(
+      &tree,
+      co,
+      dir,
+      radius,
+      hit_dist,
+      [](void *userdata, int index, const BVHTreeRay *ray, BVHTreeRayHit *hit) {
+        BVHTree_RayCastCallback_CPP fn = *static_cast<BVHTree_RayCastCallback_CPP *>(userdata);
+        fn(index, *ray, *hit);
+      },
+      &fn);
+}
+
 using BVHTree_RangeQuery_CPP = FunctionRef<void(int index, const float3 &co, float dist_sq)>;
 
 inline void BLI_bvhtree_range_query_cpp(BVHTree &tree,