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The Alpha Render Element shows the transparency of objects in the scene as grayscale colors. Solid geometry is represented by solid white, while those areas not blocked by geometry within the scene are black. Pixels at antialiased edges have varying shades of gray, as do semi-transparent surfaces.


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titleUI Path: ||Render Setup window|| > Render Elements tab ...> Add button > VRayAlpha

 ||Render Setup window||  > Render Elements  tab  > Add  button  > VRayAlpha

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  • When using transparent materials such as glass, make sure that the material is set up to treat the material as transparent with regard to the Alpha channel. For example, when using VRayMtl as the material, set the Affect channels parameter for both Reflection and Refraction to Color+alpha or All channels. Otherwise, the transparent surface will is not be treated as transparent in the Alpha Render Element.