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Mental Ray, globall illumination and noise
show user profile  PaulJBis
Hi all:

I've started dabbling with Mental Ray and global illumination techniques, and I'm having a problem that I can't explain. I created a very simple scene, with just one omni light, and rendered it using Mental Ray with Final Gather and Globall Illumination enabled. What I get is this:
http://imageshack.us/photo/my-images/855/gi2x.jpg/

Look at all the noise in the plane, in the darker area. Ugh. After reading up about final gathering and so, I tried increasing all of its parameters: point density, rays per point, interpolate over the nÂș of FG points... I also tried setting the noise filtering to "very high". But no matter how, I always get the same amount of noise.

What am I doing wrong?

read 333 times
2/6/2012 4:11:10 PM (last edit: 2/6/2012 4:11:10 PM)
show user profile  mike_renouf
Am I seeing the correct image? The Scify text right?
GI is a method for creating realistic lighting, so you need a scene and light sources that will capitalise on that.
There's no environment in which your object is sitting, so there's nothing for it to reflect or refract. If you're using an omni light then I expect it's not photometric - so max doesn't know what real world brightness to assign to it. Also I've no idea what scale your object is - it could be a mile high or an inch. Max's lighting needs things to be to scale because light has an inverse square fall off.
Hope this helps if you've not addressed these issues.




read 298 times
2/7/2012 1:37:36 PM (last edit: 2/7/2012 1:37:36 PM)
show user profile  PaulJBis
Thanks for the answer. In the end I figured it out: it was a problem with the measurements. I scaled down the entire scene and things went much better.
I didn't really need any reflections or refractions in the scene. I just wanted to get the stereotypical "soft lighting" look that is so fashionable nowadays. I guess you can fake it with Light Tracer and a skylight, or even with lots of small omni lights, as in this tutorial:
http://www.videocopilot.net/tutorials/soft_shadows_3dmax/

But I wanted to test some of the global illumination concepts I've been reading about, so decided to use Mental Ray.
read 293 times
2/7/2012 2:04:48 PM (last edit: 2/7/2012 2:04:48 PM)
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