Using displacement maps in mental ray

Maya
1

I'm having troubles finding where I set the sampling rates for displacement maps when I'm using mental ray for rendering. I'm using maya 4.5. Anyways, when I change the settings on the attribute editor for the standard displacement, nothing happens when mr does the render. I seem to be stuck with some ultra crappy sampling rate. yet if I switch back to the default maya renderer, the settings work no problem.

So if I'm using mr to render, doi set the sampling rates somewhere else? or does the standard displacement shader not work in mr? Can someone tell me what I'm not doing corrctly? thanks for any help

2

To set the sampling rate for MR displacement assign a displace approx to each displacement surface (this is under Window-rendering editors-mental ray- approximation editors). This gives you individual control if you have more than 1 displacement surface or assign a global displace approx override in the MR render globals (in the override section along with surface tesselation approx).
There are a number of presets to choose from. To get super high detail displacements use the MR fine displacement feature (preset : fine view high quality)

I hope this helps.

3

thanks, that totally clears it up! I appreciate the response, I was really baffled why the 'derive from maya' option wasn't working. I guess its cause of the 'partial' mental ray implementation in maya 4.5