Mujoco supports emission as a constant coefficient, and emissive, an rgb texture. This cl supports the rgb emissive texture for usd.
PiperOrigin-RevId: 775236677
Change-Id: I0e2ce1d9f68d79b6e9d2c28eecab22b2692f061c
The ORM texture is a packed-channel map, with ambient occlusion in Red, roughness in Green, and metallic in Blue channel.
PiperOrigin-RevId: 772367369
Change-Id: I88a4dee2477daa1e3c0b00197bfbe2b276ba9937
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