Symmetry Problem

[NathanWaaang]

Hi there!
When I tried to use SoftRas for creating 3D mesh, I found a left-right symmetry problem.
More specifically, in the mesh of data\obj\spot\spot_triangulated.obj, the cow has two spots on the left rump and one spot on the right rump. But when I run the code in examples\demo_render.py, the result turns to be one spot on the left rump and two spots on the right rump.
In another scene, I use SMPL to generate a human mesh, which should have the left foot in front, but after rendering it with soft-renderer, the right foot is in front. That is, the left and right are reversed.
I tried to fix it with mesh_.vertices[:,:,0] *= -1, but some rendering errors occurred.
It would be great if there is any possible solution for me. Thanks a lot!