Maya MR displacement help

[dushyant]

hi there,

I'm using MR displacement for the first time and I've run into a couple of issues, it would be great if I can get some help.

My current settings are:
SubD Approx
Approx Method: Spatial
Max SubD's: 5
Length: .2

I did a test to use a displacement map for bricks and the row where the shadow (raytracing) edges fall on the bricks, the horizontal lines of the mortar appear a bit skewed.

http://i194.photobucket.com/albums/z...l/DispTest.jpg

Also, when I try and increase the the max subdivisions I see some weird clipping on the geometry. I disconnected the displacement node and just did a render of the color map with the SubD Approx and this is what I got:

http://i194.photobucket.com/albums/z...NoDispTest.jpg

Thanks much!

[bart]

If you are getting clipping, did you check your render report to see if there are warnings about the max displace setting?

By subd approx, are you saying you applied a subd approx to a poly?
That creates a ccmesh

Or that you are creating a subd primitive to begin with?

Are you using view units? Ie, in that case 0.2 pixels is extremely small.