Vray Renderer

www.chaosgroup.com/vray

Material Weight Shader

Vray materials can not get a texture with alpha channel transparency by default. The transparency isadded with the Material Weight Shader, which can have a texture as input. This texture can be either a JPG or PNG. When using JPGs, depending on the invert checkmark enabled or not, it adds transparency to the dark colors (enabled) or to the light colors (disabled). When inserting a a PNG as a weighted shader bitmap, the intended behaviour is the same, just note that when you have transparency in the PNG , it might import the transparent part as black,so check the preview in the Material Weight bitmap if the PNG is imported as intended.

Currently the supported bitmap types for Material Weight shader are only PNG and JPG.