The White House

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  12 December 2013
Hey guys, I have a weird problem with the vray displacement modifier and I'm a bit dumbfounded. I am sure to 99% that I am doing something wrong but no matter what I try, I can't get rid of the issue.

I rendered a 32 bit vray zdepth of the White House and I simply want to use it do displace some sort of coin imprinting.
32bit, 16bit, TIFF, PSD, HDRI loader... I always get those bit depth problems into the surface. What am I doing wrong?

Vray 2.4, 3ds max 2014

Thanks guys!
  12 December 2013
No one else having this problem?
  12 December 2013
have you checked the depthmap in these areas?
does it look fine?
it looks like an camera based circular pattern.

perhaps a depth range problem, did you tryed different values for the depth distance in the shader/rendersetting?
  12 December 2013
The 32bit zdepth is just perfect. The circular lines come more from the zdepth itself as it represents an object in perspective and therefore each point on the front wall has a slightly different distance from the camera I used to render the zdepth. The range of the zdepth should be fine. It covers the White house form front to back perfectly so the whole range goes into where it is needed.

It looks to me that no matter what you feed into the vray displacement modifier, it gets red as 8 bit. Which would be really weird. There must be something else I am doing wrong.

Last edited by ACantarel : 12 December 2013 at 10:03 PM.
  12 December 2013
ok, so its the vray modifier that makes the trouble? but 8 bit would explain it, looks a bit like a clamp in the zdepth values.

have no vray in front of me, but in mental ray i would use a gadient node with black/white falloff from the cam view as an alternative try. perhaps its how the modifier interpretes the zdepth?
  12 December 2013
Andre, have you confirmed whether vray is reading all displacement maps as 8-bit? I haven't seen this problem before, but if that's the case, it's a massive oversight, and it would be worth letting the developers know... I'm beta testing for Chaos Group at the moment so I can raise this as a problem if it's definitely an 8-bit disp problem and isn't coming from somewhere else. Having said that their support on the Chaos Group forums is very good so you might want to ask there...

Nick Marshall
Head of Environments / Generalists
Double Negative :: Vancouver
  12 December 2013
What are you using for reading the zdepht file?
3dsmax standard bitmap reader are somewhat lacking when it comes to 16bit displacement maps, try the vrayhdri loader (it reads all kind of files)

"Is it morning allready?"
  12 December 2013
Thanks for all the input, I really appreciate it. It turns out it works all fine when I directly render the zdepth out as an EXR. What I did before was writing out a tiff file which caused the problem. When I take that exr and load it via the vray hdri loader, it works and the steps disappear. I knew the error was on my side you never stop learning!
  12 December 2013
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