Merge branch 'blender-v2.83-release'

1 files changed, 10 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/pbvh.c b/source/blender/blenkernel/intern/pbvh.c
index f72ecd568e2..b65089c7599 100644
--- a/source/blender/blenkernel/intern/pbvh.c
+++ b/source/blender/blenkernel/intern/pbvh.c
@@ -2155,7 +2155,11 @@ static bool pbvh_faces_node_raycast(PBVH *bvh,
         float location[3] = {0.0f};
         madd_v3_v3v3fl(location, ray_start, ray_normal, *depth);
         for (int j = 0; j < 3; j++) {
-          if (len_squared_v3v3(location, co[j]) < len_squared_v3v3(location, nearest_vertex_co)) {
+          /* Always assign nearest_vertex_co in the first iteration to avoid comparison against
+           * uninitialized values. This stores the closest vertex in the current intersecting
+           * triangle. */
+          if (j == 0 ||
+              len_squared_v3v3(location, co[j]) < len_squared_v3v3(location, nearest_vertex_co)) {
             copy_v3_v3(nearest_vertex_co, co[j]);
             *r_active_vertex_index = mloop[lt->tri[j]].v;
             *r_active_face_index = lt->poly;
@@ -2235,8 +2239,11 @@ static bool pbvh_grids_node_raycast(PBVH *bvh,
             const int y_it[4] = {0, 0, 1, 1};
 
             for (int j = 0; j < 4; j++) {
-              if (len_squared_v3v3(location, co[j]) <
-                  len_squared_v3v3(location, nearest_vertex_co)) {
+              /* Always assign nearest_vertex_co in the first iteration to avoid comparison against
+               * uninitialized values. This stores the closest vertex in the current intersecting
+               * quad. */
+              if (j == 0 || len_squared_v3v3(location, co[j]) <
+                                len_squared_v3v3(location, nearest_vertex_co)) {
                 copy_v3_v3(nearest_vertex_co, co[j]);
 
                 *r_active_vertex_index = gridkey->grid_area * grid_index +