CGTalk - True Mirror FX

Apollux

12-30-2005, 02:01 AM

I´m working on an scene where I need a tru mirror surface. Imagine this setup

You got a ray of light entering into a semi dark room. The ray of light hits a mirror on the wall and it is reflected to a dark corner of the room.

So far I´ve been able to see the reflected enviroment on the mirror, but neither with Blender Internal nor the Yafray engine has I been able to make the ray of light truly reflex (change it´s path) on the mirror.

Is there something I´m missing or this is out of Blender capabilities ?

Inktvlek

12-30-2005, 08:58 AM

For YafRay, you'll have to use a photon lamp to make it reflect I think...
Even with raytracing, you need photons to be able to redirect light paths

try this thread: http://yafray.org/forum/viewtopic.php?t=193

Trident_2K5

12-30-2005, 09:00 AM

This is one kind of caustics. Or should be, at least.

Apollux

12-30-2005, 12:10 PM

Guys, YOU ROCK !!

Yes, it was a Photons thing.. I added a Photon Lamp AND increased the IOR setting for the mirror and that did the trick !!

Now, whould you happen to know a way to have volumetric lights in Yafray?.. I know of a workaround in Blender, but it makes every frame to take forever to render.

drunksniper

01-08-2006, 08:06 AM

this is a pretty complex interaction of light that you want to accomplish. Yeah .. its fine if you have the power to do it brute force method (raytrace the shit out of everything) but we're talking HEAVY raytracing calculations.. for any renderer this is intense. Caustics/ Refractions/ Light transmission arent something that will render overnight.. it might take weeks .. could take hours per frame...

If you got the time and power go for it, but if you dont i suggest you take a pencil/paper and do some careful planning on alternative ways to get the effect by perhaps faking it.

Its possible :)

good luck though.

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