The crash material

[Micha_cg]

Hi,

during an arch viz I discovered this bug - a material in combination with a light cause that the memory usage strong increase during the rendering until Rhino crashs.
It's something like gunpowder, slow match wick and fire. One of my my low poly people mans is suspicious and is go into hiding.

Maybe it's a general Vray bug.

http://www.simulacrum.de/temporaryim...sage_crash.3dm

[frip51]

Re: The crash material

Morgens, 7:30 in Deutschland...

Micha,
I just gave it a try - RAM usage is about 1300MB, rendering went through in 49.8s and everything seemed fine.
Then, I entered every stamp variable available to show you my specs and all of a sudden Rhino/V-Ray froze @153MB/13%CPU.

The second try I didn't place the stamp and it didn't crash




Cheers,
Matt

[frip51]

Re: The crash material

Ha!
Placing the processorSpeed variable leads to the crash in my case.
Can anyone repeat that?


Cheers,
Matt


edit: at least it massively slows things down if I render any other scene, as well!

[fpedrogo]

Re: The crash material

I think the problem is the Blend material. Some time my Rhino crash when I have glass material in one of the sub-material. Have you tried without the blend material?

[Micha_cg]

Re: The crash material

No, because I needed the blend material to get the glow effect at this lighting sphere. But without the light inside (place above the sphere) it was working. At my machine the RAM usage continuous increase. The RAM usage of this simple scene without textures should be very low.

I hope one of the next VfR will allow to disable shadows for single objects. This is a good example. I need a light sphere at medium brightness, so that it is not burned out and a bright inner light source to get a good visible lighting effect around the sphere. Here an image that show what I mean:

[frip51]

Re: The crash material

Hmmm,
you say you need the AngleBlend material?

I've tried some Fresnel gradients using this material.
No heavy RAM involvement and quicker (32.5s).
That's what it looks like:



Too far off?
Maybe you need to tweak it a bit...


Cheers,
Matt

[Micha_cg]

Re: The crash material

Right, fresnel is an option too. Only the effect could be stronger, but better than nothing.
But fixed should the bug.

Thank you.

[fpedrogo]

Re: The crash material

What about 2sided material. I believe it could do the job.

[fooprobe]

Re: The crash material

two sided won't work unless the light source is off-center towards the camera. otherwise, all parts of the sphere are the same distance from the light, so it will have a uniform illumination. if the light is off-center it does work, but if you move the camera you have to move the light. using angular blend will give you the same result regardless of the view angle.

[frip51]

Re: The crash material

But it's the AngularBlend material that causes the crash.

Could a Bulge map do the trick, somehow? Maybe if it's oriented to face the camera like a billboard?

[fooprobe]

Re: The crash material

I'm finding that angular blend is very crashy.... it will work fine, then if i swap out the submaterials it crashes. simple submaterials, nothing complicated. if instead i change the "working" submaterials to match the one i wanted to use, works fine. anyone experience anything similar?

[fpedrogo]

Re: The crash material

I told you that the problem is the angular material. Yes, it is very crashy.

[fooprobe]

Re: The crash material

Got it, sorry, didn't realize it was a general problem with the material.