* face num.
- len(bpy.data.meshes[].faces) -> len(bpy.data.meshes[].polygons)
* face index, vertex index
Index - bpy.data.meshes[].faces.index -> bpy.data.meshes[].polygons.index
Vertex Index - bpy.data.meshes[].faces.vertices[] -> bpy.data.meshes[].polygons.vertices[]
* face uv coord.
- bpy.data.meshes[].uv_texture_stencil.data[].uv# -> bpy.data.meshes[].uv_layer.data[].uv
