Mental ray img aliasing / sharpening

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  05 May 2013
Mental ray img aliasing / sharpening [Solved]


I have a little issue with Mental Ray that starts really pissing me off and I have no idea how that I can solve it (if it can be solved).

Every time I use an img as texture and it's rendered rather "skewed", it's not sharp. But if I render it the img more in front of the camera, the img is as sharp as the original texture.
See attachment to show you what I mean.

One img is the render with the unsharp img, and the other is the texture I used (to show you that image is sharp)

Thanks for your help

Last edited by Miniminer : 05 May 2013 at 11:19 AM.
  05 May 2013
Try changing the "blur" value in the bitmap properties. It automatically blurs textures when their angle gets more acute. The reason being that when the number of pixels on the render ends up being significantly less than in the actual texture, a lot of re-sampling needs to occur for it not to end up flickering and shimmering during motion. So it offers to blur it for you!

Turn it down to, say, 0.1 and that problem will go away, but bear in mind you'll need to turn up your AA settings.

  05 May 2013
Great, tnx. But where can I actually change that blur bitmap property ?
  05 May 2013
Originally Posted by Miniminer: Great, tnx. But where can I actually change that blur bitmap property ?

It's inside the bitmap map settings, rather than the material. So if you pull up the texture image in the material editor, you'll see it right there. It's in with all the mapping info (tiling, rotation, real world mapping etc).

  05 May 2013
Hallelujah !
Thanks a lot
  05 May 2013
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