Vray Crashes under Vista x64

[centrix]

Hi guys, this is my first post here, unfortunately containing a problem i can`t solve by myself:(

So, I tried out a VrayScatter demo today, made 2000 instances all over a plane (displaced grass,2D), applied material and tried to render it in 1900x900. It crashed immediatelly, without an error.

 

The settings:

Prim. bounce: irradiance map (low preset)

Sec bounce:light Cache

color mapping:exponential

default lights off

all other settings left on default

 

The proxies were quite heavy on polys.

 

The System:

Asus P5Q deluxe

Core2Quad 9550

8GB RAM

Vista x64

512 MB Graph. card

 

3ds max 2009 x64 SP1, all hot fixes installed

V-Ray 1.50 SP2

 

Max crashed when it hits aprox 2.9 GB Ram.

 

My question is, why is this happening under x64 system with 8GB of RAM. I know that vray had to handle some mil. of polys, but still, why it crashed under 3 GB of RAM?

 

Switching sec. bounce to none made no difference (I know light cache uses the most of the memory, while calculating).

 

Thanks in advance, hope you folks know, what to do, i would appreciate every idea.

[tayrona]

http://www.cgarchitect.com/vb/32775-how-manage-ram-useage-avoid-crashing.html

[centrix]

Thanx Tayrona, but this did not answered my questions neither solved my problem:( I have x64 OS and 8GB of ram, x64 max and x64 vray and I just can`t imagine, where could be the prob.

 

Also tried dynamic with 4,5,8k MB, still no effect

[martincg]

and without displace crashing too?

[centrix]

Yes, it crashes with disabled displace also. Although i managed to render 1 frame from out of 10, but i guess it was just a brighter moment, it fails to render on the next one. But thanx for reply, appreciate it.

[centrix]

Ok guys, I think I managed to control it without a crash.

What I did first, was raising virtual memory to 12.5GB and then,

switched to Static geometry in Vray,

changed bucket size to 32,

left sec. bounces to none,

and voila, it worked like a charm!

 

The scene consists of 15000 instances, every instance is 500 000 poly large, but it was finally stable!Tried to render in bigger res(2500x1500), no prob at all.

 

Render times fairly exceeded 11 minutes per frame (1400x600), which is acceptable.

 

I`d like to ask, what are the disadvantages of using static geometry?

[manta]

I might be wrong about this...but if your whole scene is made up of proxies, then your already using dynamic geometry, so switching to static won't make any difference...my understanding is when you have ordinary geometry, switching to dynamic essentially turns those into proxies...again I might be misunderstanding that myself...

[centrix]

This is strange,I switched back to dynamic, set it to 4000MB (the same settings as before, when i was experiencing crashes), and it rendered.

Turned sec. bounces to light cache (expecting it to crash instantly) and it computes without a prob. These lead me to a conclusion, that what really helped, was raising the virtual memory from 8.5GB to 12.5GB, which is kind of odd, i don`t really understand this.

Someone to answer this?