render_cy error

[wangrui5781]

when I add mask in folder used render_cy, sometimes I get error face mask

but when I rewrite this cython to a python function like
def sim_render_cy(vertices, new_colors, triangles, h, w):
vertices_shape0 = vertices.shape[1]
vis_colors = np.ones((1, vertices_shape0))
face_mask = render_texture(vertices, vis_colors, triangles, h, w, 1)
new_image = render_texture(vertices, new_colors, triangles, h, w, 3)
return face_mask, new_image

This error was resolved but it becomes very slow.