rendering with element active give a different result (ignoring vray dirt mask)

[jstrob]

Hi,

I have a big problem. When I render with the vray elements active, the result is very different.

I have a object with displacement and a shader with 2 layers of blend materials. I am using a vraydirt as a mask for one of them. Without the elements it renders correctly, but when I activate the elements it's like if the vraydirt is not masking anymore.

In my element I use all the raw ones and zdpeth,. dirt. multimatte and a few vraylight select.

Also it looks ok in the prepass but only when the bucket render they dont give the correct result.

Any idea?

my shader:


with element inactive:


with element active:

[jstrob]

I just installed latest vray nightlies just to see and I get the same bug! v33501, april 16 2016

If you know if a previous release could not have that bug please tell me cause I need to start my final render for delivery to my client like now.

[jstrob]

In fact a quick fix is easy, I just have to bake my dirtmap and use the bitmap as a mask instead, but would be cool if you could fix that.

[jstrob]

Baking my dirtmap does not work, the result is very different. I get splotchy stains instead of subtle streaks,

[svetlozar.draganov]

Would it be possible to send us simplified version of the scene for investigation?
Thank you very much in advance.

[jstrob]

Yes sure I 'm preparing it.

[jstrob]

Ok here is a scene reproducing the bug:

the result with element activated


and not activated


the max 2016 scene with textures
http://www.phylacterecola.com/strob/...bugElement.rar

[svetlozar.draganov]

Thanks for the scene and explanation, we managed to reproduce the issue and added it into our system with high priority.
The issue is not caused by the mask but by the BlendMtl in combination with Skin/SSS materials.

We'll let you know when we have some progress on the subject.

[jstrob]

Ok thank you so much!

Yes you are right, I noticed the bug was not occuring when not using SSS.