VrayFur - Dynamic memory limit

V-Ray V-Ray for 3ds Max Issues
1

Hi there,

I’m currently trying VrayFur modifier and I find some stranger issues.

I’ve made a very simple scene with a torus, plane and 2 lights.

When I’m putting VrayFur on the torus with the dispertion at 1 I have all my cpus running fine.
When I’m increasing the dispertion I have some cpus that are ide.
Same for all my DRs.

I have win xp pro 64 with 4 Go Ram.
Vray 1.5 SP2

By default I’m putting my Dynamic memory limit at 3500 Mo.

When I do that, I have only 1 cpu running but my ram is only used at 15 - 20 %
When I’m putting the Dynamic memory limit at 8000 Mo
I have 3 out of my 4 cpu running.

When I put the Dynamic memory limit at 20.000 Mo.
I have all my 4 cpu running and same for all my DR.

Why do I have to put the Dynamic memory limit so high?
here I have a simple scene, but if I have a complex one and that I have to realy put the Dynamic memory limit to 3500 so that it doesn’t break my render, all my cpu aren’t running…

Is this something normal ?

Thanks

Stan
3LP Team

2

update :
at the end of my irradiance map, my DR are now at 75% in the ram, and are rendering now with 1 - 2 or 3 cpu depending.

Is VrayFur not so good optimised as VrayProxy ?
With VrayProxy, I have done some forests without any problem and I assume there is a lot more polygons with a forest that I have with my simple scene and some VrayFur.

edit :
ok now I tried to put the fur on a large plane and my cpu is still working with 1 core and I did leave the Dynamic memory limit at 20.000 Mo.

I don’t understand why large amount of fur aren’t using all cores of the cpus.

3

It’s better to make your emitter pretty dense (smaller polys) still though fur takes a lot of memory. I usually just keep breaking it up into layers until I can get it to render on all cores.

4

I’m hoping VRayFur gets more love, or it’s canned alltogether in favour of Shave and Haircut for VRay :wink:

5

Hi RErender,

Thanks for the tip.
I will try to subdivide more my emitter but i think it’s already enough subdivided.
My other question, How do you break up your fur?
I understand to take the emitter and to divide it in several peaces to render then as layer from back to front, but how about a animation where the cam is moving or is making a turn around ?
My test was a turn table where the pedestal is made of grass.
Is there another possibility to break the fur pass ? along zdeph with a falloff ?

Thanks for your interest :o)

Stan
3LP Team