d3bc0544d3
Adds primvar:displayColor/primvar:displayOpacity to the geom prim if its rgba attribute differs from the default (0.5, 0.5, 0.5, 1.0). This sets the color and opacity directly on the prim with no need for an external material, making it consistent with how rgba is used in mujoco. PiperOrigin-RevId: 751013128 Change-Id: I059943ec5b266e62c3696d9a0ac4f2033db9e07f