Big commit with initial support for sculpting of meshes with the multires modifier.

With this commit, the displacement custom data is being applied to a subdivided version of the base mesh using a modification of CCGSubsurf.

Sculpting on the highest level of the multires mesh now works, with (at least) these caveats:
* Only the plain 'Draw' brush works for now
* Normals aren't being updated during sculpting, so it doesn't actually look right yet
* When displacements are applied or calculated, only interior face points are handled, so original vertices and edge vertices will look wrong after switching levels.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_subsurf.h b/source/blender/blenkernel/BKE_subsurf.h
index c3c6b8d9edd..f1d7b729d84 100644
--- a/source/blender/blenkernel/BKE_subsurf.h
+++ b/source/blender/blenkernel/BKE_subsurf.h
@@ -32,6 +32,7 @@ struct Mesh;
 struct Object;
 struct DerivedMesh;
 struct EditMesh;
+struct MultiresModifierData;
 struct SubsurfModifierData;
 
 struct DerivedMesh *subsurf_make_derived_from_derived(
@@ -40,6 +41,13 @@ struct DerivedMesh *subsurf_make_derived_from_derived(
                         int useRenderParams, float (*vertCos)[3],
                         int isFinalCalc, int editMode);
 
+struct DerivedMesh *subsurf_make_derived_from_derived_with_multires(
+                        struct DerivedMesh *dm,
+                        struct SubsurfModifierData *smd,
+			struct MultiresModifierData *mmd,
+                        int useRenderParams, float (*vertCos)[3],
+                        int isFinalCalc, int editMode);
+
 void subsurf_calculate_limit_positions(Mesh *me, float (*positions_r)[3]);
 
 #endif