Items Casting Shadows Even Though "Cast Shadow" is Turned Off

maraich

I'm trying to do a render with a plane that is emitting light with a texture applied to the plane. I have set Cast Shadow to Off, but it still casts a shadow in the render. If I turn the item to invisible in render, then it no longer emits any light. I'm using Iray. Is there any help for this? I used to use planes all the time to provide something for reflective objects to reflect, but if the plane casts a shadow, then it's no longer of any use to me. 

Richard Haseltine

You must have Show Hidden proeprties on - Cast Shadows should be hidden when Iray is the active render, since it doesn't do anything. One fix is to use a very low, but not zero, value for Cutout Opacity  - though that will kill any highlights from the light in glossy surfaces.