Vray animation CPU and GPU

[komyali]

Ok I have a lots of questions, looking for two hours on forum but didn't find what I want.

I want to create animation but I am looking for fastest way but to preserve realistic render, not high as still image but to look real.

-CPU

1. Is it faster CPU or GPU animation with vray (same quality)

2. Is it faster to throw whole scene and render at once LC IM and final frame or to use render elements and later to connect them in after effects also to use pre-calculations for LC and IM and use them "from file"? what render elements to use? and what is best mode for precalculations a. if only camera is moving b. if camera and objects are moving, asking this because IM can sometimes use previous frame IM - less time

3. I use IM for primary and LC for secondary interior scene, IM and Brute force for exterior?

4. Have two computers i7 3930k and i7 920, (also have dual core but dont use it) when they render on DR , LC is calculating just workstation? is that also happening with new 3ds max and new version of vray? solution?

5. Can somebody tell me how to adjust max tree depth and min leaf size is there something I should know or it is just pre renderings till you find out best set up ?

6. 5 minutes per frame 1920x1080 is it too much ?

 

and now GPU

 

-GPU vry RT (CUDA) production render can't render proxy and multiscatter, so automaticly I cant use for exteriors because they are big and have almost every a lot of trees grass and other stuff.

A. I want FULL HD 1920x1080 resolution so what is the minimum paths per pixel so frame could be "normal" without noise and "white pixels"

B. Can GPU GTXxxx hold that stress of couple hours of rendering and is it better to use quadro cards for this (not viewport)

C. PF with GPU? I need to google this

 

I need time to test all this stuff and google around, and I don't have it, so I am asking you to help me

[danio1011]

I don't necessarily have answers to every question but here is some data.

 

CPU

1 - It depends on your scene. Foliage? DOF? Interior or exterior? All those things change the answer to your question. I have done a bit of both and usually I end up going with CPU because my scenes are too big and I like to use Dirt (not supported on GPU). Also I have a small render farm so that changes things.

2 - The best answer to this is to take a look at Spot3d. They have lots of examples. If the camera is moving a good way to do things is to pre-calc light cache every nth frame (like every 5 frames) and then for light cache using the flythru setting. If an object is moving I believe you'll have to calculate light cache for every frame. Again, Spot3d has examples. Here is their fly through example page http://www.spot3d.com/vray/help/150SP1/tutorials_imap2.htm

3 - This is so scene dependent it's hard to answer. On some exteriors you could do away with a secondary bounce altogether if ram\time is an issue.

4 - LC is never DR. IR can be DR but sometimes it goes by faster than the scene transfers to the nodes.

 

GPU

 

1 - VRay RT 2.x has supported proxies for a while (Since 2.3 or 2.4...it's a check box in the render settings) and now in the latest version it supports Multiscatter.

2 - Just experiment with this. In my experience it is scene dependent....particularly interior vs exterior.

3 - I have a watercooled GTX 580 and it's always been great and never shown signs of instability. Not sure on air cooled cards, it would depend on your model. Some have 3 fans and I would imagine stay quite cool. GTX can actually render faster than Quadro's, too. They just don't officially 'recommend it' due to temperature and stress.

 

Anyway that's all I got. Hope it helps!

 

Dan Temple

[komyali]

Thank you very much, I read this on spot long time ago, but this is first time doing realistic animation, so I forgot about that link

didnt know that last versions of vray rt support proxy and multiscatter, I need to check, this changes everything

at the end thank you very much, I just got impatient because nobody answer my questions and then I saw your post