Mental ray gone wild

[immolatus]

I'm trying to render ambient occlusion pass at 1280x720. The problem is that mental ray keeps going over 4gb ram and machines start to crash ( they are 4gb winxp 64 boxes). The scene has rapid motion blur enabled. Its so weird. I set the memory limit to 3gb but MR doesn't seem to care. I'm really panicked right now cause if its not rendering AO how it's gonna render the scene with all the maps and textures and lights. BTW, I'm using the standard AO shader not fast AO one.

[immolatus]

This was the worst porno ever.

How come I'm the one opening the thread and your post is above mine?

[cgbeige]

ya i often see that happen for some reason. I think the forum has a crush on me.

[immolatus]

Switching from regular to large BSP solved the problem. It doesn't exceed the 3GB limit anymore. And also there is no speed decrease in renders.

[leif3d]

This was the worst porno ever.

Dang! you beat me to it!

[immolatus]

God this is frustrating. After each node renders an image the RAM usage goes up a bit. So by the time a rendernode renders its 3rd or 4th image, the ram usage goes over 4GB and the machines stop responding. Anybody has the same issue? I'm using Maya 2009.

[Hamburger]

you could try BSP2. But this is mental ray here, BSP2 doesn't fully work on Maya 2009 either but it's worth a try if you aren't using any instances.

[immolatus]

you could try BSP2. But this is mental ray here, BSP2 doesn't fully work on Maya 2009 either but it's worth a try if you aren't using any instances.

Thanks but I already tried that. Tried BSP2 with fixed or automatic memory. Still renders gone above 4gb. I finally found the issue however. It appears that if you use rapid motion(rasterizer) with AO it ****s up the memory. I'm using raytracer and motion blur preset. It's using 500mb of memory.

[royterr]

Thanks but I already tried that. Tried BSP2 with fixed or automatic memory. Still renders gone above 4gb. I finally found the issue however. It appears that if you use rapid motion(rasterizer) with AO it ****s up the memory. I'm using raytracer and motion blur preset. It's using 500mb of memory.

the same thing happens if you use scanline and motion blur.
always use the raytracer to be safe, it works well with AO and motion blur.

btw always check off "load object on demand" when rendering an AO pass to avoid problems.

[lazzhar]

it has never been domesticated.

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