Vray2.0 Vector Displacement and Mudbox 2012

[ruffstuff]

Im struggling to get the results from Mudbox to look identical in Vray. Has anyone had success with this? It seems close, but Im missing a lot of the details.

Fred

[vlado]

It's a lot easier with V-Ray for Maya (see here: http://www.spot3d.com/vray/help/maya...lacement.htm); for 3ds Max you need some additional steps (mostly converting the displacement texture from the format that Mudbox outputs to the one that V-Ray expects). I'll see if I can make the same tutorial there too.

Best regards,
Vlado

[Siddartha]

Hello Vlado,

i would really appreciate if you could explain how to do in a few words. i will explain my workaround for a test scene and maybe u could tell me what I've done wrong.

in 3dsmax
- create a box like a brick
- chamfer the edges
- add a level 2 turbo smooth
- unwrap the uvs
- export as obj

in mudbox
- add subdivision 3 times
- sculpting with different brushes, deform the geometry
- map extraction with absolute tangent and save as exr

in after effects
- change channel
- do arithmetic for multiply and add
- render the frame

back in 3dsmax
- add a vraydisplacementmod
- 3d mapping
- the vector displacement map as bitmap
- check the "vector displacement"

then render.

it looks terrible, nothing similar to the mud box.
the left image is the modified one and the right the original from mudbox.

thanks a lot,
Sid

[vlado]

I'm looking into it; I will post my results when I'm done.

Best regards,
Vlado

[jstrob]

Here is the tut for max:
Eureka!


Found it from that scene uploaded by someone nicknamed Alvarezcb:
http://dl.dropbox.com/u/11943709/Mud...splacement.zip

I used the ear vector displacement supplied by Beige on another thread here:
http://www.can-con.ca/temps/ear_tan_vdm.exr.zip

[jstrob]

and...

[jstrob]

With this technique I'm still getting small artifacts in the uv seems. I just installed vay 2.20.01 right now to see if the new smooth uv option can get rid of this but in my tests that option didn't change anything. I'm still getting those artifact at the seems....

[stevesideas]

Im don't know this technique at all but to reduce/remove seems when using standard displacement you reduce the blur on the displacement bitmaps to 0.001 or something similar/small...you've probably this already

[jstrob]

Thanks steve, I think I removed the blur everywhere. But still I will take another look at my whole process to see if some blur could have be added somewhere. But vlado told me on another post that the seams are always problematic with vector displacement. And that I should regular displacement with ptex... I'll give this a try.

[ruffstuff]

I tested this setup and although it works for the ear (for me i had to amplify the displacement settings to 10 -.5) i cannot get it working for my mudbox scene. I'd really like to see learn more on what would go wrong setting this up.

[vlado]

What is your scene?

Best regards,
Vlado

[joconnell]

Yep getting huge problems here too.

[vlado]

Then get us a scene, either here or to our support guys at vray@chaosgroup.com

Best regards,
Vlado

[joconnell]

Gonna do a confirm to make sure I'm not doing something really stupid here first