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Displacement Nightmare! Please Help!
Posted: Mon Sep 01, 2008 9:48 pm
by lukasso_dm
Hello everyone,
As I'm learning Maxwell there is one paramount problem that troubles me. Namely, the enigmatic behavior of displacement. So here is what happens: I take a grass material for my exterior and optimize it for scene A. It looks great, just as it's supposed to. Than, I use the same material for scene B, and follow the same technique, adjusting tiling, setting the proper height, and even changing the precision to adaptive. This time however, regardless of what I change I get a completely flat surface. Please give me some hints as to what I'm doing wrong.
Great Thanks in advance!
Lukasz
Posted: Mon Sep 01, 2008 10:07 pm
by KurtS
does the surface that you apply the grass material to have the exact same size in the two scenes?
Posted: Mon Sep 01, 2008 10:46 pm
by Becco_UK
Does the 'grass' surface in your second scene have enough sub divisions?
Posted: Tue Sep 02, 2008 3:10 am
by lukasso_dm
The two surfaces are of different size but I adjusted the grass material accordingly, by using the scale option in the UV Parameters tab. The first one is a "toposurface" imported from Revit, and the second one is a quadPatch from 3d studio max, with more than enough sub divisions.
Posted: Tue Sep 02, 2008 6:10 am
by JTB
Check if scale is ok.
Posted: Tue Sep 02, 2008 1:25 pm
by Mihai
Post a screenshot of your displacement settings. Is the quad patch exported from max as an instance?
Posted: Tue Sep 02, 2008 4:05 pm
by Bubbaloo
I am willing to bet that the toposurface does not have good enough subdivisions (evenly spaced) for Maxwell's displacement. Revit models are sometimes less than optimal.
Posted: Thu Sep 04, 2008 1:12 pm
by lukasso_dm
The toposurface is the one that works. I'm posting images of the two scenes. I would greatly appreciate if you could point out what I'm doing wrong in terms of displacement for the QuadPatch (image1). As for the height and precision level, I've tried many different values and regardless of my input, I still get the same output which is a dull flat plane.
Posted: Thu Sep 04, 2008 3:30 pm
by Mihai
How subdivided is the large plane? Did you try setting absolute height and setting it to something like 5cm? The same displacement material will not look the same applied to different scaled planes especially of they have a very different amount of subdivisions. If you have a 100m plane consisting of just one polygon the displacement will need more precision than with a plane that's heavily subdivided. In general it's a good idea to have a fairly subdivided surface so you can set the precision lower.
