CGTalk - Displacement Problem (Mental ray)

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Infinite Vacuum

08-27-2004, 09:37 AM

Just another topic about how difficult is to configure mental ray displacement mapping for doing what you need. (Or maybe i´m just dumb)

On the image (it is a part of the interior of the human body, sorry, i can´t post something more cool (C)), what you see is a bitmap doing displacement for a plane. The plane gests subdivided on render at 2.

Does not matter what parameters i tweak, i only get more and more rendering times and those little triangles more and more small, but unsmoothed.

Sorry for my lack of english. Hope you can help me!

http://img36.exs.cx/img36/8440/displace.jpg

http://img41.exs.cx/img41/2174/displacewindow.gif

three

08-27-2004, 12:30 PM

You can try to remove the displacement from the map channel, and instead add a Displace modifier on top of your stack.
In the "Image" section, add your picture as a Map or Image (I don't know the difference, sorry).
This works for me, I never get any displacement using the material editor.

jason-slab

08-27-2004, 01:02 PM

what is the rez of your bitmap, maybe the problem is there?
whats the displacement settings in your material editor?

|jason

Infinite Vacuum

09-06-2004, 09:16 AM

Thanks for your answers!

I need to use mental ray displacement. The Displace Modifier works with max own displacement. Very far from mr :)

Map size is not the problem. I have been using 4096x4096 maps with tons of details and it still does the same.

As far as i know, edge lenght limits the distance in edges (or pixels if in view mode) that mr should calculate, so higher values seem to render less detail than lower values.
Max Displace controls the subdivision. High values does big subdivisions, but for me, it still does those creepy triangles.

This is just so frustrating :P

Thanks for your help!

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