reflection falloff?

[lazzhar]

I think it could be done with help of the utility Sampler Info. I didnt use it for this purpose but I think it's "doable" ;)
I wished asking this question a long time agao but I didnt, here is the time to ask with you Brent Turbo about that.

[Brent Turbo]

Thanks for the reply, lazzhar. It doesn't appear that samplerInfo is the lone answer to this riddle. Using it, and other nodes, I'm able to find the coordinates of the rendered point in world space, and find the coresponding tangent to that surface, but figuring out another world space coordinate for the point at which the ray terminates is the tough part, because I can't find anything relevant to that in either saplerInfo, or the reflect node. This is frustrating, because it's obvious that Maya HAS to calculate this exact thing in order to raytrace in the first place. The end goal is coming up with a float value for distance between the rendered surface and the reflected surface.

Thanks!
Brent

[BigSky]

You need the wonderNode:

createNode distanceBetween

hint:

connect the world inverse matrix of your surface which is measured from as inmatrix

and the point world of a sampler info node. There's an example here, where this info is generated for a shading network:

http://www.cgtalk.com/showthread.php?s=&threadid=97893

There's also a wonderful PIXHO tutorial on this
issue:http://www.3dluvr.com/pixho/toolbox/mel/refBox/refBox_doc.htm

[buki]

Hi!
If you want to render a vry fine controlable reflection blur,
download the ReflectionUtility written by Horwatth Szabolcs, it's on highend:
http://www.highend3d.com/maya/shaders/

It's very fast and very cool, a must for realistic reflections.
It works under mental ray.

regards
daniel

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