I'm using a user_ibl_env (Mental Ray Light) to light a car. Does anybody know if there is a way to turn off the Blackplate(HDR) visibility ? I need to render this out with an Alpha Channel.
Click on whatever your using to map your HDR and hit ctrl-A to bring up the attributes tab, In the attributes of that object look under "Render Stats" and uncheck "Primary Visibility" That should give you what you need.
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