un-subdivide bmesh operator, useful for making lower polygon versions of models, can give nicer results then edge collapsing which tends to give a lot of sharp triangles.

works on edges and faces, has iteration option to further reduce the poly count.

access from the edge menu, under subdivide.

example: http://www.graphicall.org/ftp/ideasman42/bmesh_unsubdivide.png

1 files changed, 11 insertions, 3 deletions

diff --git a/source/blender/editors/mesh/editmesh_select.c b/source/blender/editors/mesh/editmesh_select.c
index fe3860de839..40132c697e6 100644
--- a/source/blender/editors/mesh/editmesh_select.c
+++ b/source/blender/editors/mesh/editmesh_select.c
@@ -2165,11 +2165,19 @@ static void walker_deselect_nth(BMEditMesh *em, int nth, int offset, BMHeader *h
 	         BMW_FLAG_NOP, /* don't use BMW_FLAG_TEST_HIDDEN here since we want to desel all */
 	         BMW_NIL_LAY);
 
+	/* use tag to avoid touching the same verts twice */
+	BM_ITER_MESH (ele, &iter, bm, itertype) {
+		BM_elem_flag_disable(ele, BM_ELEM_TAG);
+	}
+
 	BLI_assert(walker.order == BMW_BREADTH_FIRST);
 	for (ele = BMW_begin(&walker, h_act); ele != NULL; ele = BMW_step(&walker)) {
-		/* Deselect elements that aren't at "nth" depth from active */
-		if ((offset + BMW_current_depth(&walker)) % nth) {
-			BM_elem_select_set(bm, ele, FALSE);
+		if (!BM_elem_flag_test(ele, BM_ELEM_TAG)) {
+			/* Deselect elements that aren't at "nth" depth from active */
+			if ((offset + BMW_current_depth(&walker)) % nth) {
+				BM_elem_select_set(bm, ele, FALSE);
+			}
+			BM_elem_flag_enable(ele, BM_ELEM_TAG);
 		}
 	}
 	BMW_end(&walker);