bmesh: new wireframe tool

- makes wireframe from faces.
- options similar to inset (even offset, relative scale)
- copies face settings and loops (uvs, vcolors)
- optionally replaces the existing geometry.

4 files changed, 44 insertions, 0 deletions

diff --git a/source/blender/bmesh/intern/bmesh_opdefines.c b/source/blender/bmesh/intern/bmesh_opdefines.c
index 4b5c67c8671..8ffaf1875cf 100644
--- a/source/blender/bmesh/intern/bmesh_opdefines.c
+++ b/source/blender/bmesh/intern/bmesh_opdefines.c
@@ -1109,6 +1109,25 @@ static BMOpDefine bmo_inset_def = {
 };
 
 /*
+ * Wire Frame
+ *
+ * Makes a wire copy of faces.
+ */
+static BMOpDefine bmo_wireframe_def = {
+	"wireframe",
+	{{BMO_OP_SLOT_ELEMENT_BUF, "faces"},   /* input faces */
+	 {BMO_OP_SLOT_ELEMENT_BUF, "faceout"}, /* output faces */
+	 {BMO_OP_SLOT_BOOL, "use_boundary"},
+	 {BMO_OP_SLOT_BOOL, "use_even_offset"},
+	 {BMO_OP_SLOT_FLT, "thickness"},
+	 {BMO_OP_SLOT_BOOL, "use_relative_offset"},
+	 {BMO_OP_SLOT_FLT, "depth"},
+	 {0} /* null-terminating sentinel */},
+	bmo_wireframe_exec,
+	0
+};
+
+/*
  * Vertex Slide
  *
  * Translates vertes along an edge
@@ -1192,6 +1211,7 @@ BMOpDefine *opdefines[] = {
 	&bmo_bridge_loops_def,
 	&bmo_solidify_def,
 	&bmo_inset_def,
+	&bmo_wireframe_def,
 	&bmo_vertex_slide_def,
 };
 
diff --git a/source/blender/bmesh/intern/bmesh_operators_private.h b/source/blender/bmesh/intern/bmesh_operators_private.h
index 423b30a503a..e222c3422c0 100644
--- a/source/blender/bmesh/intern/bmesh_operators_private.h
+++ b/source/blender/bmesh/intern/bmesh_operators_private.h
@@ -100,5 +100,6 @@ void bmo_create_circle_exec(BMesh *bm, BMOperator *op);
 void bmo_bridge_loops_exec(BMesh *bm, BMOperator *op);
 void bmo_solidify_face_region_exec(BMesh *bm, BMOperator *op);
 void bmo_inset_exec(BMesh *bm, BMOperator *op);
+void bmo_wireframe_exec(BMesh *bm, BMOperator *op);
 
 #endif /* __BMESH_OPERATORS_PRIVATE_H__ */
diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c
index 3543fd952bb..e9a35ff70a2 100644
--- a/source/blender/bmesh/intern/bmesh_queries.c
+++ b/source/blender/bmesh/intern/bmesh_queries.c
@@ -928,6 +928,28 @@ float BM_vert_calc_shell_factor(BMVert *v)
 }
 
 /**
+ * \note quite an obscure function.
+ * used in bmesh operators that have a relative scale options,
+ */
+float BM_vert_calc_mean_tagged_edge_length(BMVert *v)
+{
+	BMIter iter;
+	BMEdge *e;
+	int tot;
+	float length = 0.0f;
+
+	BM_ITER_ELEM_INDEX (e, &iter, v, BM_EDGES_OF_VERT, tot) {
+		BMVert *v_other = BM_edge_other_vert(e, v);
+		if (BM_elem_flag_test(v_other, BM_ELEM_TAG)) {
+			length += BM_edge_calc_length(e);
+		}
+	}
+
+	return length / (float)tot;
+}
+
+
+/**
  * Returns the edge existing between v1 and v2, or NULL if there isn't one.
  *
  * \note multiple edges may exist between any two vertices, and therefore
diff --git a/source/blender/bmesh/intern/bmesh_queries.h b/source/blender/bmesh/intern/bmesh_queries.h
index aefeb80c4f3..08e15884b3f 100644
--- a/source/blender/bmesh/intern/bmesh_queries.h
+++ b/source/blender/bmesh/intern/bmesh_queries.h
@@ -65,6 +65,7 @@ void    BM_edge_calc_face_tangent(BMEdge *e, BMLoop *e_loop, float r_tangent[3])
 
 float   BM_vert_calc_edge_angle(BMVert *v);
 float   BM_vert_calc_shell_factor(BMVert *v);
+float   BM_vert_calc_mean_tagged_edge_length(BMVert *v);
 
 BMEdge *BM_edge_exists(BMVert *v1, BMVert *v2);