From 13a1a4c15e965f5b9bc99dc88eb379ff3b919567 Mon Sep 17 00:00:00 2001
From: Geoffrey Bantle <hairbat@yahoo.com>
Date: Wed, 1 Mar 2006 03:33:45 +0000
Subject: -> Vertex Group/Weight support in removedoublesflag()

Remove doubles didn't previously deal with vertex groups/weights properly. Now it averages the weights of vertices when they are doubles and share the same group. Verts that get merged but don't belong to all the same groups are dealt with as well.
---
 source/blender/src/editmesh_tools.c | 48 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/source/blender/src/editmesh_tools.c b/source/blender/src/editmesh_tools.c
index c5c3a1e14e1..c751443471d 100644
--- a/source/blender/src/editmesh_tools.c
+++ b/source/blender/src/editmesh_tools.c
@@ -212,7 +212,8 @@ int removedoublesflag(short flag, float limit)		/* return amount */
 	xvertsort *sortblock, *sb, *sb1;
 	struct facesort *vlsortblock, *vsb, *vsb1;
 	float dist;
-	int a, b, test, amount;
+	int a, b, test, amount, currweight, doubweight, targetweight;
+	MDeformWeight *newdw;
 
 	/* flag 128 is cleared, count */
 	eve= em->verts.first;
@@ -271,6 +272,51 @@ int removedoublesflag(short flag, float limit)		/* return amount */
 	}
 	MEM_freeN(sortblock);
 
+	
+	for(eve = em->verts.first; eve; eve=eve->next){
+		
+		if(eve->f & flag) {
+			if(eve->f & 128) {
+			
+				v1 = eve->tmp.v;
+				
+				if(v1->dw && eve->dw){
+				
+					for(doubweight=0; doubweight < eve->totweight; doubweight++){
+						targetweight = -1;
+						for(currweight = 0; currweight < v1->totweight; currweight++){
+							if(v1->dw[currweight].def_nr == eve->dw[doubweight].def_nr){
+								targetweight = currweight;
+								break;
+							}
+						}
+						
+						if(targetweight != -1){		/*average*/
+							v1->dw[targetweight].weight = (v1->dw[targetweight].weight + eve->dw[doubweight].weight) / 2;
+						}
+						else{	/*append*/
+							newdw = MEM_callocN(sizeof(MDeformWeight)*(v1->totweight+1), "MDeformWeight Append");
+							memcpy(newdw, v1->dw, sizeof(MDeformVert)*v1->totweight);
+							MEM_freeN(v1->dw);
+							
+							v1->dw= newdw;
+							v1->dw[v1->totweight].weight = eve->dw[doubweight].weight;
+							v1->dw[v1->totweight].def_nr = eve->dw[doubweight].def_nr;
+							v1->totweight++;
+						}	
+					}
+				}
+				else if(eve->dw){	/*just straight copy vert weights*/
+					
+					newdw = MEM_mallocN(sizeof(MDeformWeight) * (eve->totweight), "MDeformWeight Copy");
+					memcpy(newdw, eve->dw, sizeof(MDeformWeight)*eve->totweight);
+					v1->dw= newdw;
+					
+				}
+			}
+		}
+	}
+
 	/* test edges and insert again */
 	eed= em->edges.first;
 	while(eed) {
-- 
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