Lattice Modifier add invert vgroup option

Adds the invert vertex group option to the Lattice modifier.

Adds a short flag and modifies the existing char padding for the correct amount.
Adds a .invert_vgroup to the LatticeDeformUserdata.
Passes the flag into the lattice_deform_verts function where the weights around found and used.
For the other calls of lattice_deform_verts function they pass in NULL for the flag in the same way they pass NULL for the vgroup name.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D6747

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index 39efe838bab..631a995c743 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -182,9 +182,15 @@ typedef struct LatticeModifierData {
   /** Optional vertexgroup name, MAX_VGROUP_NAME. */
   char name[64];
   float strength;
-  char _pad[4];
+  short flag;
+  char _pad[2];
 } LatticeModifierData;
 
+/*Lattice modifier flags */
+enum {
+  MOD_LATTICE_INVERT_VGROUP = (1 << 0),
+};
+
 typedef struct CurveModifierData {
   ModifierData modifier;