1 files changed, 32 insertions, 0 deletions
diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index 99ee22328ea..3b48207f461 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -434,6 +434,38 @@ BLI_INLINE bool SCULPT_is_cloth_deform_brush(const Brush *brush)
           brush->deform_target == BRUSH_DEFORM_TARGET_CLOTH_SIM);
 }
 
+BLI_INLINE bool SCULPT_tool_needs_all_pbvh_nodes(const Brush *brush)
+{
+  if (brush->sculpt_tool == SCULPT_TOOL_ELASTIC_DEFORM) {
+    /* Elastic deformations in any brush need all nodes to avoid artifacts as the effect
+     * of the Kelvinlet is not constrained by the radius. */
+    return true;
+  }
+
+  if (brush->sculpt_tool == SCULPT_TOOL_POSE) {
+    /* Pose needs all nodes because it applies all symmetry iterations at the same time
+     * and the IK chain can grow to any area of the model. */
+    /* TODO: This can be optimized by filtering the nodes after calculating the chain. */
+    return true;
+  }
+
+  if (brush->sculpt_tool == SCULPT_TOOL_BOUNDARY) {
+    /* Boundary needs all nodes because it is not possible to know where the boundary
+     * deformation is going to be propagated before calculating it. */
+    /* TODO: after calculating the boudnary info in the first iteration, it should be
+     * possible to get the nodes that have vertices included in any boundary deformation
+     * and cache them. */
+    return true;
+  }
+
+  if (brush->sculpt_tool == SCULPT_TOOL_SNAKE_HOOK &&
+      brush->snake_hook_deform_type == BRUSH_SNAKE_HOOK_DEFORM_ELASTIC) {
+    /* Snake hook in elastic deform type has same requirements as the elastic deform tool. */
+    return true;
+  }
+  return false;
+}
+
 /* Pose Brush. */
 void SCULPT_do_pose_brush(struct Sculpt *sd,
                           struct Object *ob,