Blend material bug with refractive materials

[KyronVFX]

I tried to connect a glass material and a diffuse material to a vray blendmaterial, but it seems to bug if I put the diffuse in the base material and the glass in the coat 0 material.
Weird thing is if I invert (glass in base and diffuse in coat 0)them it seems to work fine. Tested in 2.1 stable and latest nightly.
Just using a checker for the blend amount, but its the same problem with a bitmap.

Test scene here: http://www.speedyshare.com/dEPk4/blendTest.mb

[tashko.zashev]

Hi,

Thanks for the feedback and scene file. It seems that the transparency doesn't work correct when is used as a Coat material.
Will make a note to fix this.

[vlado]

This is not a bug and we won't fix it. Glass will only work properly if it is the base material.

Best regards,
Vlado

[Karol.Osinski]

Hey vlado is there any work around to blend together two refractive glass materials with a map inside the blend amount slot? I tried it today and it gave me rather strange results..will continue to look through the forum anyway.

[yolov]

There might be other approaches depending on what you need to get out of this.
For example, you might just need to add a second reflective coat. Or a texture for the refraction glossiness might give you the result.
If you can share more details, we'd be able to give come up with more ideas.

[seandunderdale]

I often make car window glass as a blend shader and it works fine. A base shader with standard glass attributes, but with reflection turned off. That same shader duplicated and dropped into slot 1 with reflections on, but refractions off, and blended using a fresnel map. Then I'll put a bump map into the bump slot to create the distorted wobble reflected look you get on car windows. Seems to work ok in that instance having a glass in the base, but Im not mixing any diffuse in, which might be where the issue is.