Sculpt: Cloth Simulation Dynamic area mode

This simulation area mode moves the active area with the brush. When
enabled, the cloth brush has no restrictions on stroke length, area or
mesh vertex count.

In order to work, this enables PBVH nodes dynamically for simulation as
the stroke location moves and builds the constraints for new nodes
during the stroke. When a node is not inside the simulated area, all the
constraints that were created for it and vertex collisions are not
computed. The simulation limits falloff areas and constraints tweaking
control how the simulated and no simulated nodes blend.

Reviewed By: sergey, zeddb

Differential Revision: https://developer.blender.org/D8726

1 files changed, 12 insertions, 7 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index b846e009369..e6710e27115 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -372,6 +372,11 @@ struct SculptClothSimulation *SCULPT_cloth_brush_simulation_create(struct Sculpt
                                                                    const bool needs_deform_coords);
 void SCULPT_cloth_brush_simulation_init(struct SculptSession *ss,
                                         struct SculptClothSimulation *cloth_sim);
+
+void SCULPT_cloth_sim_activate_nodes(struct SculptClothSimulation *cloth_sim,
+                                     PBVHNode **nodes,
+                                     int totnode);
+
 void SCULPT_cloth_brush_store_simulation_state(struct SculptSession *ss,
                                                struct SculptClothSimulation *cloth_sim);
 
@@ -381,13 +386,13 @@ void SCULPT_cloth_brush_do_simulation_step(struct Sculpt *sd,
                                            struct PBVHNode **nodes,
                                            int totnode);
 
-void SCULPT_cloth_brush_build_nodes_constraints(struct Sculpt *sd,
-                                                struct Object *ob,
-                                                struct PBVHNode **nodes,
-                                                int totnode,
-                                                struct SculptClothSimulation *cloth_sim,
-                                                float initial_location[3],
-                                                const float radius);
+void SCULPT_cloth_brush_ensure_nodes_constraints(struct Sculpt *sd,
+                                                 struct Object *ob,
+                                                 struct PBVHNode **nodes,
+                                                 int totnode,
+                                                 struct SculptClothSimulation *cloth_sim,
+                                                 float initial_location[3],
+                                                 const float radius);
 
 void SCULPT_cloth_simulation_limits_draw(const uint gpuattr,
                                          const struct Brush *brush,