Use the S matrix of the modifier CG algorithm for implementing collision

responses.

The S matrix together with the z Vector encodes the degrees of freedom
of a colliding hair point and the target velocity change. In a collision
the hair vertex is restricted in the normal direction (when moving
toward the collider) and the collision dynamics define target velocity.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_cloth.h b/source/blender/blenkernel/BKE_cloth.h
index 151a2b58ad3..df118276809 100644
--- a/source/blender/blenkernel/BKE_cloth.h
+++ b/source/blender/blenkernel/BKE_cloth.h
@@ -44,6 +44,7 @@ struct ClothModifierData;
 struct CollisionModifierData;
 struct CollisionTree;
 struct VoxelData;
+struct PartDeflect;
 
 #define DO_INLINE MALWAYS_INLINE
 
@@ -201,6 +202,9 @@ void cloth_find_point_contacts(struct Object *ob, struct ClothModifierData *clmd
                                ColliderContacts **r_collider_contacts, int *r_totcolliders);
 void cloth_free_contacts(ColliderContacts *collider_contacts, int totcolliders);
 
+bool cloth_points_collpair_response(struct ClothModifierData *clmd, struct CollisionModifierData *collmd, struct PartDeflect *pd,
+                                    struct CollPair *collpair, float dt, float r_impulse[3]);
+
 ////////////////////////////////////////////////