Particle system parenting

* Allows moving, rotating & scaling of particle simulations.
* Setting in particle render options.
* Changes viewed & rendered particles from global space to parent space.
* Doesn't effect simulations at all.

release/ui/buttons_particle.py

@@ -288,7 +288,9 @@ class PARTICLE_PT_render(ParticleButtonsPanel):
 		psys = context.particle_system
 		part = psys.settings
 		
-		layout.itemR(part, "material")
+		row = layout.row()
+		row.itemR(part, "material")
+		row.itemR(psys, "parent");
 		
 		split = layout.split()
 			

source/blender/editors/space_view3d/drawobject.c

@@ -3239,6 +3239,9 @@ static void draw_new_particle_system(Scene *scene, View3D *v3d, RegionView3D *rv
 			if(draw_as!=PART_DRAW_PATH){
 				state.time=cfra;
 				if(psys_get_particle_state(scene,ob,psys,a,&state,0)){
+					if(psys->parent)
+						Mat4MulVecfl(psys->parent->obmat, state.co);
+
 					/* create actiual particle data */
 					switch(draw_as){
 						case PART_DRAW_DOT:

source/blender/makesdna/DNA_particle_types.h

@@ -192,6 +192,7 @@ typedef struct ParticleSystem{				/* note, make sure all (runtime) are NULL's in
 	struct Object *target_ob;
 	struct Object *keyed_ob;
 	struct Object *lattice;
+	struct Object *parent;					/* particles from global space -> parent space */
 
 	struct ListBase effectors, reactevents;	/* runtime */
 	

source/blender/makesrna/intern/rna_particle.c

@@ -1715,6 +1715,14 @@ static void rna_def_particle_system(BlenderRNA *brna)
 	RNA_def_property_pointer_sdna(prop, NULL, "pointcache");
 	RNA_def_property_struct_type(prop, "PointCache");
 	RNA_def_property_ui_text(prop, "Point Cache", "");
+
+	/* offset ob */
+	prop= RNA_def_property(srna, "parent", PROP_POINTER, PROP_NONE);
+	RNA_def_property_pointer_sdna(prop, NULL, "parent");
+	RNA_def_property_flag(prop, PROP_EDITABLE);
+	RNA_def_property_ui_text(prop, "Parent", "Use this object's coordinate system instead of global coordinate system.");
+	RNA_def_property_update(prop, NC_OBJECT|ND_PARTICLE, "rna_Particle_redo");
+
 }
 
 void RNA_def_particle(BlenderRNA *brna)

source/blender/render/intern/source/convertblender.c

@@ -1886,6 +1886,9 @@ static int render_new_particle_system(Render *re, ObjectRen *obr, ParticleSystem
 			if(psys_get_particle_state(re->scene,ob,psys,a,&state,0)==0)
 				continue;
 
+			if(psys->parent)
+				Mat4MulVecfl(psys->parent->obmat, state.co);
+
 			VECCOPY(loc,state.co);
 			if(part->ren_as!=PART_DRAW_BB)
 				MTC_Mat4MulVecfl(re->viewmat,loc);