Add 'loop slide' option to bevel. See T45260

Current behavior of bevel is to 'loop slide' along unbeveled edges
when possible, but this produces uneven bevel widths sometimes,
so this option lets user choose between having the loop slide effect
or having more even bevel widths. Trying it out with default being
'no loop slide', so different from current behavior. May reverse this
choice later, depending on user reactions.

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/editors/mesh/editmesh_bevel.c b/source/blender/editors/mesh/editmesh_bevel.c
index 1abb7a30889..70997762909 100644
--- a/source/blender/editors/mesh/editmesh_bevel.c
+++ b/source/blender/editors/mesh/editmesh_bevel.c
@@ -156,6 +156,7 @@ static bool edbm_bevel_calc(wmOperator *op)
 	const bool vertex_only = RNA_boolean_get(op->ptr, "vertex_only");
 	const bool clamp_overlap = RNA_boolean_get(op->ptr, "clamp_overlap");
 	int material = RNA_int_get(op->ptr, "material");
+	const bool loop_slide = RNA_boolean_get(op->ptr, "loop_slide");
 
 	/* revert to original mesh */
 	if (opdata->is_modal) {
@@ -167,8 +168,8 @@ static bool edbm_bevel_calc(wmOperator *op)
 
 	EDBM_op_init(em, &bmop, op,
 	             "bevel geom=%hev offset=%f segments=%i vertex_only=%b offset_type=%i profile=%f clamp_overlap=%b "
-	             "material=%i",
-	             BM_ELEM_SELECT, offset, segments, vertex_only, offset_type, profile, clamp_overlap, material);
+	             "material=%i loop_slide=%b",
+	             BM_ELEM_SELECT, offset, segments, vertex_only, offset_type, profile, clamp_overlap, material, loop_slide);
 
 	BMO_op_exec(em->bm, &bmop);
 
@@ -501,5 +502,6 @@ void MESH_OT_bevel(wmOperatorType *ot)
 	RNA_def_boolean(ot->srna, "vertex_only", false, "Vertex Only", "Bevel only vertices");
 	RNA_def_boolean(ot->srna, "clamp_overlap", false, "Clamp Overlap",
 	                "Do not allow beveled edges/vertices to overlap each other");
+	RNA_def_boolean(ot->srna, "loop_slide", false, "Loop Slide", "Prefer slide along edge to even widths");
 	RNA_def_int(ot->srna, "material", -1, -1, INT_MAX, "Material", "Material for bevel faces (-1 means use adjacent faces)", -1, 100);
 }