Backface colors flipped when using different and custom backface shading

Hi!

I am using polyscope in python on my intel Mac. When I read this mesh and choose the "backface shading -> custom" option, all faces assume the "inverted" color, despite this mesh being definitely not inverted. Here's a MWE:

import igl
import polyscope as ps
V, _, N, F, _, _ = igl.read_obj("test/unit_tests_data/bunny_oded.obj")
ps.init()
ps.register_surface_mesh("bunny", V,F)
ps.show()

Here is what I see:

首先，使用提供的 bunny_oded.obj 网格运行 Python MWE，并选择 backface shading → custom。跟踪负责选择正面颜色和反转颜色的 backface shading 路径，然后验证网格显示正确的自定义 backface 颜色，而不是将所有面都视为已反转。