Todo issue: sculpting on deformed mesh

Used a crazyspace approach (like in edit mode), but only modifiers with
deformMatricies are allowed atm (currently shapekeys and armature modifiers only).
All the rest modifiers had an warning message that they aren't applied because
of sculpt mode. Deformation of multires is also unsupported.

With all this restictions users will always see the actual "layer" (or maybe
mesh state would be more correct word) they are sculpting on.

Internal changes:
- All modifiers could have deformMatricies callback (the same as deformMatriciesEM but
  for non-edit mode usage)
- Added function to build crazyspace for sculpting (sculpt_get_deform_matrices), but it
  could be generalized for usage in other painting modes (particle edit mode, i.e)

Todo:
- Implement crazyspace correction to support all kinds of deformation modifiers
- Maybe deformation of multires isn't so difficult?
- And maybe we could avoid extra bad-level-stub for ED_sculpt_modifiers_changed
  without code duplicating?

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index a48d6d8d9c9..76a7349606c 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -61,6 +61,9 @@ void sculpt(Sculpt *sd);
 int sculpt_poll(struct bContext *C);
 void sculpt_update_mesh_elements(struct Scene *scene, struct Object *ob, int need_fmap);
 
+/* Deformed mesh sculpt */
+void sculpt_free_deformMats(struct SculptSession *ss);
+
 /* Stroke */
 struct SculptStroke *sculpt_stroke_new(const int max);
 void sculpt_stroke_free(struct SculptStroke *);
@@ -78,6 +81,7 @@ typedef struct SculptUndoNode {
 	void *node;					/* only during push, not valid afterwards! */
 
 	float (*co)[3];
+	float (*orig_co)[3];
 	short (*no)[3];
 	int totvert;