Vray problems with crashing and massive memory useage.

[Mxg]

Hey guys, I am having a really hard and frustrating time with this model I'm working on.

 

First of max keeps crashing over and over and over this started happening ever since I imported some older work I had done into my new scene and I cant seem to make it stop so I am saving constantly to avoid losing work.

 

Second thing is Vray is taking up a lot of ram to render scenes and when I try to render at a somewhat high resolution of 1080p max crashes and it takes up to an hour during the building of the light cache to do so, I built this machine brand new for max i7 920 rig with 6 gigs of ram. My older pc was an old Pentium D Dual Core and 2 gigs of ram and while it would chug it was at least able to render scene at that resolution with scene with up to 1 million polys.

 

The scene I am trying to render now only has 250k polygons, something has to be wrong somewhere I cannot understand why I am getting such poor performance it's just making it extremely frustrating.

 

And finally when I am able to render albeit at super small resolutions I see these blotches on my render on the displacement maps I tried upping the H and S subdivisions but it did not help.

 

(please check the attached file.)

 

Sorry for the small res but its all I could get out of max.

 

Also here are the V ray settings I've got

 

 

(please check the attached file.)

[WAcky]

In your VRAY system rollout you're only letting VRAY use 400mb of your memory. Before you hit render, see how much free memory you have and enter that into this box. Probably will be around 3 or 4gb

 

Also the reason your light cache is taking so long to calculate is because you have tight bounds enabled in your default displacement rollout. Try turning this off and your displacement will be calculated as the the image is rendering.

 

Once you're able to render a larger image, we can start to look at these blotches. Turning up settings won't make problems going away. It will sometimes make them worse.

[Mxg]

Thanks alot for the tips Wacky it worked and I am able to render in high res in only 8 mins compared to the hour I had before.

 

If you would please take a look at my scene it is a small job I got from someone I know and I really want to impress them with something more realistic than what I can do here and I only really know the basics of vray.

 

How could I improve this scene ? Also the object to the left in the scene is meant to be a water feature which is supposed to have water running from the top of the wall into the area at the bottom. I bought Glu3d to help me out with it. I am lighting the scene with a Vray light sphere with a multiplier of 1.5 and it is located at the top of the scene.

[Mxg]

Don't mean to self bump but I was working on it some more and it seems the blotchiness problem went away somehow (for the most part). The problem I am having now besides going for more realism if you notice the wall texture is looking to show it's cubbed pattern is there anyway to fix that ? I tried to in the UVW map but the only way I can get rid of it is making the texture to big and I am not getting the texture to be how I want it. They way it is in the image is exactly how I want it but that tiled look messes it up, any thoughts ?

[WAcky]

If you want some critiques, I would move the thread over to the WIP forum. There ppl will be more likely to give you some feedback.

[Mxg]

Hey I am back in this thread again because Vray is doing the same thing as before except on a different part of the scene. The settings you told me to change before worked perfectly but when I move to a more enclosed area on the side of the building the render times sky rocket from about 20 mins to 4 -5 hours and even then it crashes midway through. I have attached my settings and a screen shot of the view port to see if this can help out.

 

Everything in the view port pic besides the objects in white has a displacement map on it with "tight bounds off" and "keep continuity" on. There are also 2 Vray lights in the scene and both of them have there sub divisions set to 12. When I reduced the subdivisions it make no difference in the render time. Please help me out.

[WAcky]

Well I dont know if my eyes are getting bad but I can't see any settings on that grab.

 

Displacement is something to be used very sparingly. I would suggest limiting it as much as you possibly can. Try bump mapping or even normal mapping as a workaround.

 

To workout what your issue is I would disable all displacement maps then go through turning on displacement maps one at a time until your scene stalls. Then you will know which map is giving you issues.

 

I rarely use displacement.

[Mxg]

Hmm some how the image got scaled down from when I uploaded it, maybe you can see it now and give me feed back I will try what you said as well.

 

EDIT: Ok I tired what you said and it was not the displacement causing the trouble it was the fence I made to the left in the view port every time I hid the black part of the fence render times are normal.

 

This would be fine but I need to have the fence in the scene can any certain settings be touched on to allow me to render the fence with everything else as well ?

Edited October 29, 2009 by Mxg