Often I create planes with a vray light material to use as objects in the scene to create good reflections. I just discovered that Vray RT will display objects with vray light material from the backside even if it is not emitting light from the back side. The result is a difference between rendering and RT preview. For now I need to be sure my objects are pointed in the right direction or be sure that it is emitting on back side to be sure that the RT and rendering match.
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RT displaying Vray light material but not rendering it
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