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, 8 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_cloth.c b/source/blender/makesrna/intern/rna_cloth.c
index 38086502d6f..22cc2e2c9c3 100644
--- a/source/blender/makesrna/intern/rna_cloth.c
+++ b/source/blender/makesrna/intern/rna_cloth.c
@@ -152,7 +152,7 @@ static char *rna_ClothSettings_path(PointerRNA *ptr)
 	Object *ob= (Object*)ptr->id.data;
 	ModifierData *md= modifiers_findByType(ob, eModifierType_Cloth);
 
-	return BLI_sprintfN("modifiers[%s].settings", md->name);
+	return md ? BLI_sprintfN("modifiers[%s].settings", md->name) : NULL;
 }
 
 static char *rna_ClothCollisionSettings_path(PointerRNA *ptr)
@@ -160,7 +160,7 @@ static char *rna_ClothCollisionSettings_path(PointerRNA *ptr)
 	Object *ob= (Object*)ptr->id.data;
 	ModifierData *md= modifiers_findByType(ob, eModifierType_Cloth);
 
-	return BLI_sprintfN("modifiers[%s].collision_settings", md->name);
+	return md ? BLI_sprintfN("modifiers[%s].collision_settings", md->name) : NULL;
 }
 
 #else
@@ -207,6 +207,12 @@ static void rna_def_cloth_sim_settings(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Goal Damping", "Goal (vertex target position) friction.");
 	RNA_def_property_update(prop, 0, "rna_cloth_update");
 
+	prop= RNA_def_property(srna, "internal_friction", PROP_FLOAT, PROP_NONE);
+	RNA_def_property_float_sdna(prop, NULL, "velocity_smooth");
+	RNA_def_property_range(prop, 0.0f, 1.0f);
+	RNA_def_property_ui_text(prop, "Internal Friction", "");
+	RNA_def_property_update(prop, 0, "rna_cloth_update");
+
 	/* mass */
 
 	prop= RNA_def_property(srna, "mass", PROP_FLOAT, PROP_NONE);