Strange noise on my material

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  05 May 2013
Strange noise on my material

Hey, I'm having a small problem with a scene in a short film I'm making. Its to do with the texture on the wall. It should be smooth (kinda like the window frame) however its covered in bumps in the render. The displacement map I'm using is fine because I have used it in different scenes prior to this one. I have also tried to apply a new material to the wall (with the displacement map) and still I get the same problem. Ive tried playing around with a few settings but I just cant get my head around it. I'm still quite new to CG so most of the toggles I have no clue about :P Is there a setting perhaps that I have pushed by accident that is causing this?

Heres an image to show you what I mean:

  05 May 2013
Obvious question is; why are you using a displacement map if you want smooth geo?

If you are using a displacement for the large geometry, just a small unseen difference between pixels could cause that issue. Avoid jpegs.

Last edited by fleabay : 05 May 2013 at 08:07 PM.
  05 May 2013
Ive used the map plenty of times in previous shots it just seems to be wierd in this one for some reason. It was made in photoshop so the pixel accuracy is dead on. In the shot itself it is a large wall as the camera zooms out which is why I choose displacement maps to detail it. As for the format its open EXR. I just cant figure out why there is some kind of bump map showing on it ><
  05 May 2013
Just a heads up for anyone else who ever has this problem. For some reason the more reflection you add to your material the more the material looks distorted. Ive given up on the issue, just going to have to drop the reflection down to a point where its not so noticeable.
  05 May 2013
Try a different material. I've heard good things about mia_material_x (mental ray)
  05 May 2013
Like someone said, why are you using displacement if you want it smooth? Anyhow, just lower the displacement height instead of lowering the reflection.
  05 May 2013
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