Fix T65620: Sculpting brush size jumping.

The PBVHs raycast function calls `isect_ray_tri_epsilon_v3` with epsilon `0.1` which is inaccurate and may result in the problem presented in T65620.
The solution is to use `isect_ray_tri_watertight_v3` instead `isect_ray_tri_epsilon_v3`.
This can positively affect other areas as well.

Reviewers: brecht, campbellbarton

Differential Revision: https://developer.blender.org/D5083

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/pbvh_intern.h b/source/blender/blenkernel/intern/pbvh_intern.h
index 74d7312e6a7..dc9d796075b 100644
--- a/source/blender/blenkernel/intern/pbvh_intern.h
+++ b/source/blender/blenkernel/intern/pbvh_intern.h
@@ -174,14 +174,14 @@ void BBC_update_centroid(BBC *bbc);
 int BB_widest_axis(const BB *bb);
 void pbvh_grow_nodes(PBVH *bvh, int totnode);
 bool ray_face_intersection_quad(const float ray_start[3],
-                                const float ray_normal[3],
+                                struct IsectRayPrecalc *isect_precalc,
                                 const float *t0,
                                 const float *t1,
                                 const float *t2,
                                 const float *t3,
                                 float *depth);
 bool ray_face_intersection_tri(const float ray_start[3],
-                               const float ray_normal[3],
+                               struct IsectRayPrecalc *isect_precalc,
                                const float *t0,
                                const float *t1,
                                const float *t2,
@@ -208,7 +208,7 @@ void pbvh_update_BB_redraw(PBVH *bvh, PBVHNode **nodes, int totnode, int flag);
 /* pbvh_bmesh.c */
 bool pbvh_bmesh_node_raycast(PBVHNode *node,
                              const float ray_start[3],
-                             const float ray_normal[3],
+                             struct IsectRayPrecalc *isect_precalc,
                              float *dist,
                              bool use_original);
 bool pbvh_bmesh_node_nearest_to_ray(PBVHNode *node,