Zbrush Displacement Not Working

[jonathan_musso]

Hi all,

I am trying to render some animal sculptures with V-Ray for the first time, and am using 32bit exr displacement maps that I extracted from zbrush. I setup a new lookdev project and scene, and was following the steps given to me in my previous post. For some reason the displacement is not showing. I created a new scene to test with Arnold quickly, and can confirm that the maps in fact work.

In the following screenshot I have done the following:

1. Import model
2. Create VRayMtl
3. Create VRay Rectangle Light
4. Select model and create Subdivision, Subdivision and Displacement Control attributes
5. Select model then Create > V-Ray > V-Ray Displacement > Apply Single Displacement
6. Render

Not sure what I have done wrong, but, the displacement isn't viewable. Using these same methods in another test file with tiling fabric textures, the displacement works. If I add a noise into the displacement attribute, it will work on this creature. It appears to not like this map for whatever reason.

Any advice is greatly appreciated. Thank you very much!

[jonathan_musso]

Ok, I have an update. I discovered that V-Ray doesn't like me scaling up the model. The displacement appears to load if I try rendering at the default scale. The moment I increase the scale, it disappears. I tried to dial in the intensity, which works, but it looks like the mid value is changed as parts of the displacement map are not visible.

[hermit.crab]

Mind if you send us the scene along with the assets so we can troubleshoot?

[jonathan_musso]

Mind if you send us the scene along with the assets so we can troubleshoot?

Hi there. Thank you for your reply. I have just sent my support request. Thanks and I look forward to hearing back from you and your team!

[jonathan_musso]

Hi everyone. I am still communicating with support, but I have an update and was wondering if anyone could possibly help. Displacement from Zbrush still does not work. Support suggested that V-Ray only reads from 0 - 1, no negative values. I've done the default map extraction settings with a mid value of 0, (the V-Ray docs suggest to do this). The results leave the negative values not present. So I tried exporting with the mid value at 0.5, which results in massive over inflating. Adjusting the alpha offset to the file node yields no results. I cannot remove the inflation.

I'm wondering what I am doing wrong here to get this working with V-Ray? If anyone has any suggestions that would be greatly appreciated. Thank you!

[damaggio]

you need to enter the negative value in the explicite attribute.

[jonathan_musso]

you need to enter the negative value in the explicite attribute.

Where does this need to be done? I have attempted this in the file node, which I always do with Arnold, and it doesn't appear to change anything. Thank you for your assistance.

[damaggio]

Check these settings...