Hair dynamics with cloth simulation

- Hair dynamics have their own panel in particle settings with the settings from cloth panel that apply to hair.
- Basic internal friction force to quickly emulate self collisions and volume preservation. (Still very early code, but gives some idea of what's possible).
- Softbody simulation is no longer used for hair.
	* Old files with sb dynamics should just load the hair without dynamics so new dynamics can be applied.
	* Invasion of particles exceptions in sb code is finally over.
- Collisions with other objects are disabled for now and will be worked out in the future.

Other changes/fixes:
- Particle mode editing flag wasn't saved properly.
- Some old files with edited hair didn't load correctly.
- Disabled delete & specials menu in particle mode for non-hair editing.
- Fixed yet one more cloth & softbody pointcache update issue.
- Disconnect/connect hair now uses only the deformed mesh so it works correctly also for subsurfed emitters.
- Hair editing now updates correctly with a moving emitter.

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_cloth.h b/source/blender/blenkernel/BKE_cloth.h
index bc4585106e6..e5b3adbd0c0 100644
--- a/source/blender/blenkernel/BKE_cloth.h
+++ b/source/blender/blenkernel/BKE_cloth.h
@@ -176,7 +176,8 @@ typedef enum
 	CLOTH_SIMSETTINGS_FLAG_GOAL = ( 1 << 3 ), 	// we have goals enabled
 	CLOTH_SIMSETTINGS_FLAG_TEARING = ( 1 << 4 ),// true if tearing is enabled
 	CLOTH_SIMSETTINGS_FLAG_SCALING = ( 1 << 8 ), /* is advanced scaling active? */
-	CLOTH_SIMSETTINGS_FLAG_CCACHE_EDIT = (1 << 12)	/* edit cache in editmode */
+	CLOTH_SIMSETTINGS_FLAG_CCACHE_EDIT = (1 << 12),	/* edit cache in editmode */
+	CLOTH_SIMSETTINGS_FLAG_NO_SPRING_COMPRESS = (1 << 13) /* don't allow spring compression */
 } CLOTH_SIMSETTINGS_FLAGS;
 
 /* COLLISION FLAGS */