I've had these problems before in the standard scanline renderer, but I was wondering if vray had anything available to solve the issue.

Check the attachments below. I have a vrayBlendMaterial, the base material is just a grey diffuse, and the Coat material is referencing a bitmap for it's color and opacity (the alpha of the bitmap). The bitmap is saved as a transparent tif through photoshop. The rendered result has nasty dark rings around it, ie, it's not compositing properly. Un-pre-multiplying the texture doesn't seem to help. Does anyone know what can be done to solve this? Some sort of extra operation on the bitmap? A different bitmap format?

Any advice will be uber appreciated.

- Neil
neil@soulburn3d.com