Hello, I am working with library Alembic. Alembic has a viewer-app that render Alembic data. Now I am trying to render Alembic data from native code. And I am having some troubles: - incorrect order of polygons ( back polygon covers front polygon ) - some normals of faces are inverted Note: The same data renders correctly in Alembic viewer. I think z-buffer doesn't work at all. I tried to set different flags and values but without a result. How does OpenGL native z-buffer work in Unity plugin? or how can I enable OpenGL native z-buffer in Unity plugin?