BMesh: option to filter out faces during raycast

This allows us to more easily cast from the surface of a mesh
without normal offsets (Which can give precision issues).

1 files changed, 12 insertions, 2 deletions

diff --git a/source/blender/blenkernel/BKE_editmesh_bvh.h b/source/blender/blenkernel/BKE_editmesh_bvh.h
index 168f700d132..3ee7dcd94b8 100644
--- a/source/blender/blenkernel/BKE_editmesh_bvh.h
+++ b/source/blender/blenkernel/BKE_editmesh_bvh.h
@@ -43,6 +43,8 @@ struct Scene;
 
 typedef struct BMBVHTree BMBVHTree;
 
+typedef bool (*BMBVHTree_FaceFilter)(struct BMFace *f, void *userdata);
+
 BMBVHTree      *BKE_bmbvh_new_from_editmesh(
         struct BMEditMesh *em, int flag,
         const float (*cos_cage)[3], const bool cos_cage_free);
@@ -55,8 +57,16 @@ BMBVHTree      *BKE_bmbvh_new(
         const float (*cos_cage)[3], const bool cos_cage_free);
 void            BKE_bmbvh_free(BMBVHTree *tree);
 struct BVHTree *BKE_bmbvh_tree_get(BMBVHTree *tree);
-struct BMFace  *BKE_bmbvh_ray_cast(BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
-                                   float *r_dist, float r_hitout[3], float r_cagehit[3]);
+
+struct BMFace  *BKE_bmbvh_ray_cast(
+        BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
+        float *r_dist, float r_hitout[3], float r_cagehit[3]);
+
+struct BMFace  *BKE_bmbvh_ray_cast_filter(
+        BMBVHTree *tree, const float co[3], const float dir[3], const float radius,
+        float *r_dist, float r_hitout[3], float r_cagehit[3],
+        BMBVHTree_FaceFilter filter, void *filter_cb);
+
 /* find a face intersecting a segment (but not apart of the segment) */
 struct BMFace  *BKE_bmbvh_find_face_segment(BMBVHTree *tree, const float co_a[3], const float co_b[3],
                                             float *r_fac, float r_hitout[3], float r_cagehit[3]);