From e144a05114428804fe4ab004adb6d5129e8f0634 Mon Sep 17 00:00:00 2001
From: Geoffrey Bantle <hairbat@yahoo.com>
Date: Tue, 7 Nov 2006 00:34:48 +0000
Subject: [PATCH] ->Commit of patch #5132: Separate by material

This patch adds a new option to the separate menu in editmode, 'By Material'.
It simply loops through all materials in the mesh selects the faces associated
with them and calls separate().

Thanks to Andrea Weikert for the patch!
---
 source/blender/include/BIF_editmesh.h |  1 +
 source/blender/src/editmesh.c         | 35 ++++++++++++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/source/blender/include/BIF_editmesh.h b/source/blender/include/BIF_editmesh.h
index 8a1b480caaa..cbd0cf0704b 100644
--- a/source/blender/include/BIF_editmesh.h
+++ b/source/blender/include/BIF_editmesh.h
@@ -63,6 +63,7 @@ extern void undo_push_mesh(char *name);
 extern void separatemenu(void);
 extern void separate_mesh(void);
 extern void separate_mesh_loose(void);
+extern void separate_material(void);
 
 /* ******************* editmesh_add.c */
 extern void make_prim(int type, float imat[3][3], short tot, short seg,
diff --git a/source/blender/src/editmesh.c b/source/blender/src/editmesh.c
index a45f413928e..e138631e548 100644
--- a/source/blender/src/editmesh.c
+++ b/source/blender/src/editmesh.c
@@ -1382,7 +1382,7 @@ void separatemenu(void)
 
 	if(G.editMesh->verts.first==NULL) return;
 	   
-	event = pupmenu("Separate %t|Selected%x1|All Loose Parts%x2");
+	event = pupmenu("Separate %t|Selected%x1|All Loose Parts%x2|By Material%x3");
 	
 	if (event==0) return;
 	waitcursor(1);
@@ -1394,10 +1394,43 @@ void separatemenu(void)
 	case 2:	    	    	    
 		separate_mesh_loose();	    	    
 		break;
+	case 3:
+		separate_material();
+		break;
 	}
 	waitcursor(0);
 }
 
+void separate_material(void)
+{
+	EditMesh *em = G.editMesh;
+	unsigned char curr_mat;
+	Mesh *me;
+	
+	me= get_mesh(G.obedit);
+	if(me->key) {
+		error("Can't separate with vertex keys");
+		return;
+	}
+
+	if(G.obedit && em) {
+		if(G.obedit->type == OB_MESH) {
+			for (curr_mat = 1; curr_mat < G.obedit->totcol; ++curr_mat) {
+				/* clear selection, we're going to use that to select material group */
+				EM_clear_flag_all(SELECT);
+				/* select the material */
+				editmesh_select_by_material(curr_mat);
+				/* and now separate */
+				separate_mesh();
+			}
+		}
+	}
+	
+	countall();
+	allqueue(REDRAWVIEW3D, 0);
+	DAG_object_flush_update(G.scene, G.obedit, OB_RECALC_DATA);
+
+}
 
 void separate_mesh(void)
 {