Displacment = Crash?

[natehess]

Hello and all the best to CGarchitect forums! This is my first post, but these forums have been a great resource nonetheless for some time.

 

I'm having quite a problem. I have a low-poly scene, essentially a pile of 1400 cubes with the same vray displacement modifier on the whole group. I'm using 1.5 SP2 with Max 2009. The scene renders fine at low resolutions, but crashes immediately after the prepasses finish when I render larger than 1024x768. I'm aiming for 4000 x 3000.

 

RAM is not the issue, the render eats only 1.5gb of 8 gb before it crashes.

I've tried vray frame buffer rendering to vray raw. I've tried dynamic geometry, etc. These techniques do nothing to help, and I really don't think RAM is the issue.

 

Has anyone else experienced similar problems in a scene with lower polys but lots of displacement? The disp map is only 256x256 px and i've pared everything down as best I could, but now I'm at a loss.

 

If anyone has any ideas, I'd really appreciate it.

 

Thanks, best, and greets to the CGarchitect forums!

[Paul Twyman]

Are you using 32bit or 64bit windows/max? Even if you have 8gb of ram if you do not have 64bit versions you will not be able to use it all. 1.5gb sounds about the point that 32 bit normally gives up, and if it is fine at lower res then this is probbaly the issue. Displacement does use a lot of memory though have you tried turning off the displacement and rendering at the same to resolution to see if it is anything to do with that?

[BrianKitts]

are you using 2D or 3D displacement?

[natehess]

3d displacement, uvw face mapped, keep continuous

 

i'm running xp x64 with 8gb. like i said, the computer is only using 1.5 gb max on this render.

 

thanks again

[manish_mv]

Hi

 

If you are running a 32 bit max (doesnt matter if system os is 32 or 64) the ram usage per application would not exceed 1.33 gb because the application would crash after that.

 

so u must have 64 bit max too.

 

now if you have 64 bit max then follow these two easy steps

 

1 check whether your displacement is applied in matelial properties or not. If yes switche the same map to the object modifier.

 

2 turn displacement to 2d and set the resolution under "2d mapping" to 256 (If you are using 256x256 resolution image like you said). The idea is to make it the approximate average of width and height pixels.

 

thanks

 

cu

[BrianKitts]

I was going to suggest trying 2D displacement as well....

 

out of curiosity have you tried a quick test render with the global switch for displacement turned off to make sure that's what is causing your problem?

[mfured20]

Yo, I just mentioned this a second ago in the other post, but while using 3D mapping, increase your Edge Length when you go higher in final render size. That should solve your problem.

 

I talked about it in Eroor - "UNHANDLED EXEPTION" a minute ago, you can read what else I said about it in that thread.