Add the ability to create internal springs to the cloth sim

This can be used to make closed surfaces behave more like a soft body.

Reviewed By: Jacques Lucke

Differential Revision: http://developer.blender.org/D5788

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_cloth.h b/source/blender/blenkernel/BKE_cloth.h
index d59a81c1baf..17de53be42a 100644
--- a/source/blender/blenkernel/BKE_cloth.h
+++ b/source/blender/blenkernel/BKE_cloth.h
@@ -115,6 +115,7 @@ typedef struct ClothVertex {
   float shear_stiff;
   int spring_count;      /* how many springs attached? */
   float shrink_factor;   /* how much to shrink this cloth */
+  float internal_stiff;  /* internal spring stiffness scaling */
   float pressure_factor; /* how much pressure should affect this vertex */
 } ClothVertex;
 
@@ -198,8 +199,12 @@ typedef enum {
   CLOTH_SIMSETTINGS_FLAG_PRESSURE = (1 << 5),
   /** Use the user defined target volume. */
   CLOTH_SIMSETTINGS_FLAG_PRESSURE_VOL = (1 << 6),
+  /** True if internal spring generation is enabled. */
+  CLOTH_SIMSETTINGS_FLAG_INTERNAL_SPRINGS = (1 << 7),
   /** DEPRECATED, for versioning only. */
   CLOTH_SIMSETTINGS_FLAG_SCALING = (1 << 8),
+  /** Require internal springs to be created between points with opposite normals. */
+  CLOTH_SIMSETTINGS_FLAG_INTERNAL_SPRINGS_NORMAL = (1 << 9),
   /** Edit cache in edit-mode. */
   CLOTH_SIMSETTINGS_FLAG_CCACHE_EDIT = (1 << 12),
   /** Don't allow spring compression. */
@@ -230,6 +235,7 @@ typedef enum {
   CLOTH_SPRING_TYPE_GOAL = (1 << 4),
   CLOTH_SPRING_TYPE_SEWING = (1 << 5),
   CLOTH_SPRING_TYPE_BENDING_HAIR = (1 << 6),
+  CLOTH_SPRING_TYPE_INTERNAL = (1 << 7),
 } CLOTH_SPRING_TYPES;
 
 /* SPRING FLAGS */