From e30d8f45ef13c6258eea5edd33898a5bf9af4e92 Mon Sep 17 00:00:00 2001
From: Cody Winchester <CodyWinch>
Date: Tue, 18 Feb 2020 16:54:00 +0100
Subject: Modifiers: Laplacian Deform modifier add invert vgroup option

Adds the invert vgroup option to the Laplacian Deform modifier.

Differential Revision: https://developer.blender.org/D6843
---
 source/blender/modifiers/intern/MOD_laplaciandeform.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'source/blender/modifiers')

diff --git a/source/blender/modifiers/intern/MOD_laplaciandeform.c b/source/blender/modifiers/intern/MOD_laplaciandeform.c
index 866cf67bf79..f2f99b7ddfa 100644
--- a/source/blender/modifiers/intern/MOD_laplaciandeform.c
+++ b/source/blender/modifiers/intern/MOD_laplaciandeform.c
@@ -528,6 +528,7 @@ static void initSystem(
   MDeformVert *dvert = NULL;
   MDeformVert *dv = NULL;
   LaplacianSystem *sys;
+  const bool invert_vgroup = (lmd->flag & MOD_LAPLACIANDEFORM_INVERT_VGROUP) != 0;
 
   if (isValidVertexGroup(lmd, ob, mesh)) {
     int *index_anchors = MEM_malloc_arrayN(numVerts, sizeof(int), __func__); /* over-alloc */
@@ -542,7 +543,8 @@ static void initSystem(
     BLI_assert(dvert != NULL);
     dv = dvert;
     for (i = 0; i < numVerts; i++) {
-      wpaint = defvert_find_weight(dv, defgrp_index);
+      wpaint = invert_vgroup ? 1.0f - defvert_find_weight(dv, defgrp_index) :
+                               defvert_find_weight(dv, defgrp_index);
       dv++;
       if (wpaint > 0.0f) {
         STACK_PUSH(index_anchors, i);
@@ -596,6 +598,7 @@ static int isSystemDifferent(LaplacianDeformModifierData *lmd,
   MDeformVert *dvert = NULL;
   MDeformVert *dv = NULL;
   LaplacianSystem *sys = (LaplacianSystem *)lmd->cache_system;
+  const bool invert_vgroup = (lmd->flag & MOD_LAPLACIANDEFORM_INVERT_VGROUP) != 0;
 
   if (sys->total_verts != numVerts) {
     return LAPDEFORM_SYSTEM_CHANGE_VERTEXES;
@@ -612,7 +615,8 @@ static int isSystemDifferent(LaplacianDeformModifierData *lmd,
   }
   dv = dvert;
   for (i = 0; i < numVerts; i++) {
-    wpaint = defvert_find_weight(dv, defgrp_index);
+    wpaint = invert_vgroup ? 1.0f - defvert_find_weight(dv, defgrp_index) :
+                             defvert_find_weight(dv, defgrp_index);
     dv++;
     if (wpaint > 0.0f) {
       total_anchors++;
-- 
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