VRaydirt doesn't work when composite with another procedural map as VRayBend Mask

[hammerbchen]

Hi,

I am trying to create a rusted metal
a) metal is a very simple refelctive VRaystandard.
b) for the rust material I use a bitmap for another VRaystandard in diffuse.
c) I blend the a) and b) using VRayBlend with Composite as blend mask (a VRayDirt + Bercon noise map)

Not sure it was just me or a bug. When I render out this VRayBlend material, the blend mask seems not working. While I use this blend mask in diffuse (another VRay standard material), VRay are able render out the texture correctly.

Am I do anything wrong?

Chen

[hammerbchen]

This is the effect I am after (image attached), except I want the rust limit in the region of VRayDirt, not just uniform scattering on surface of teapot. Somehow I just can't make it happen..

[hammerbchen]

OK, I found a solution for this:

Uncheck "ignore for gi" in VRayDirt

works like a charm

[Art48]

Okay, but is it intentional? I mean I would never get the idea of unchecking that for the desired effect? oO

[Svetlozar Draganov]

It should work regardless of the status of the Ignore for GI checkbox, or at least in my test it works fine.
scene:http://ftp.chaosgroup.com/support/sc...rt_as_mask.max

Would it be possible to send us that scene for investigation?

[hammerbchen]

scene file attached. If I check "ignore for gi", the rendering result will be just black in the area of AO.

[Art48]

Do you use the progressive sampler? Does it happen with the adaptive, too? Had a similarish problem once with the progressive sampler although different context.

[hammerbchen]

Do you use the progressive sampler? Does it happen with the adaptive, too? Had a similarish problem once with the progressive sampler although different context.

I use IR + Brute Force and adaptive. I think V-Ray create VRayDirt only in last rendering pass if you check "ignore for gi", which causing problem in my case.

[Svetlozar Draganov]

Which is the exact V-Ray version that you are using?
With 3.30.01 the result is the same regardless the status of Ignore For GI option.

[hammerbchen]

Which is the exact V-Ray version that you are using?
With 3.30.01 the result is the same regardless the status of Ignore For GI option.

VRay 3.20.02

[tashko.zashev]

VRay 3.20.02

Thank you Chen,

From what I can see the scene is lit mostly by Environment lighting - GI and this is the reason why the final appearance of the shader is being influenced by the Ignore for GI option. If you wish to keep this option enabled, then you may consider adding a light source in the scene.