Mental ray displacement gets sloooow when uping the resolution?

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
Old 03 March 2013   #1
Mental ray displacement gets sloooow when uping the resolution?

Im trying to render some stuff with displacement on a mesh that uses the "smooth mesh" stuff. Looks absolutely perfect, but whenever I try to render stuff in a higher resolution it gets waaaaaaay to slow. Ive had cases when it took about 20 min to render something in 2k, and when I tried to up it to 4k I got bored of waiting for the render to even go past the first subdividing stuff after 8+ hours.
Whyyy do this happen and what can I do about it?

And yeah, Ive tried the approximation thing, but it doesn't look nearly as good as the default press on the three button on my keyboard. :P
 
Old 03 March 2013   #2
Is this from zbrush?
 
Old 03 March 2013   #3
I would say its definetely caused by unnecessary high tesselation settings (memory issue).

Note that a lot of mray approximation settings is pixel based so you edge could be composed of much more pixels in higher res image....which means it get much more tesselated.

Similar is subsurface scattering lightmap which by default is driven by resolution expression so when one higher up the res, it eats ram like hell cos its in full 32bit float!

So, try to experiment with approx settings...

P.S. turn off "FeatureDisplacement" under Shape attribs...then you are sure that mray approx is taking care of the tesselation
 
Old 03 March 2013   #4
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
__________________
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
 
Thread Closed share thread



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
CGSociety
Society of Digital Artists
www.cgsociety.org

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump
Miscellaneous

All times are GMT. The time now is 02:36 PM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.