Bug : 2 VRayBlendMtl + VRayMtl2Sided...

[bigbossfr]

Hi,
I don't know if it is a bug but it is not normal :
- create a plane
- create a sphere light behind the plane (to have a translucency)
- assign a VRayMtl2Sided to the plane (with a translucency value to 0.2 for example)
- now assign a VRayBlendMtl1 to the front material of the VRayMtl2Sided, and an another VRayBlendMtl2 in the back material.
- connect a VRayMtl (with a checker in the diffuse color for example) into the base material of the VRayBlendMtl1 and the VRayBlendMtl2.

Render.
All will be fine.

Now, enable the "additive mode" of the VRayBlendMtl1 or VRayBlendMtl2 (or all VRayBlendMtl)
Render.
Bug, the translucency is bad...
Is it a bug ?

I send you the scene with this thread.
We are in production on a feature film.
Last nightly build, Maya 2011 Linux64.

[vlado]

Thanks for the scene; looking into it now - however keep in mind that the additive mode is a hack; it can have unexpected consequences.

Best regards,
Vlado