P-Median Test

Sebastian · Post by **Sebastian** » Wed Apr 04, 2007 8:59 pm

I've Tested to simulate the Ray-"Way", but it doesn't work.
The solid Objekts are all Mirrows.

mrCarnivore · Post by **mrCarnivore** » Wed Apr 04, 2007 9:26 pm

Did you mean you wanted to make the ray-trajectory visible? What exactly is the model supposed to be?

If a material is tooo reflective you should lower the IOR-value...

Kram1032 · Post by **Kram1032** » Wed Apr 04, 2007 9:39 pm

The material isn't too reflective, he ment the things inside the tube and the left big things - THOSE are reflective and supposed to be

@ Sebastian:
wait until 0.7.6, use slight SSS in the glass tube and (that's why you should wait) activate BiDir

It's not that far until 0.7.6

Sebastian · Post by **Sebastian** » Thu Apr 05, 2007 3:07 am

But wehere is the fault in the Scene ??
Isn't it possible to make Light visible which is reflected by a mirror ??

PS: My material is already SSS Material with a low gain-level.

DaveC · Post by **DaveC** » Thu Apr 05, 2007 3:17 am

I've been trying a very similar expermint to this involving one of the disco mirror-balls. And basically got nowhere.

Kram1032 · Post by **Kram1032** » Thu Apr 05, 2007 3:29 am

It should be possible, then.... maybe, you should slightly increase the gain...

I can see 2 light beems and one reflection at the bottom og the tube....

mrCarnivore · Post by **mrCarnivore** » Thu Apr 05, 2007 6:18 pm

I've been trying to make a dusty room with a window where the sun could shine through. I wanted to make the sunbeam visible like it's seen in many movies.

Couldn't make the light beam visible. The room just became brighter almost everywhere with sss-fog... Guess you need some other feature for dusty rooms (or foggy disco indoors) which is not (yet?) implemented in indigo.

Post by **OnoSendai** » Thu Apr 05, 2007 8:24 pm

mrCarnivore wrote:I've been trying to make a dusty room with a window where the sun could shine through. I wanted to make the sunbeam visible like it's seen in many movies.

Couldn't make the light beam visible. The room just became brighter almost everywhere with sss-fog... Guess you need some other feature for dusty rooms (or foggy disco indoors) which is not (yet?) implemented in indigo.

It shoud work...

mrCarnivore · Post by **mrCarnivore** » Thu Apr 05, 2007 8:48 pm

The only effect I got was the look of a milky fluid and the beam of light from the window was not in any form clearly defined. More or less the whole room lit up.

Have you tried to emulate this effect yourself?

Post by **OnoSendai** » Thu Apr 05, 2007 8:52 pm

No, I haven't tried. Might try in the Sponza atrium tho, that would be cool.
Try lowering the scattering coefficient : the effect you're after is basically a single scattering effect.

mrCarnivore · Post by **mrCarnivore** » Thu Apr 05, 2007 10:00 pm

so by lowering the scattering coeffecient the number a ray is scattered is reduced and not the amount of light that is scattered?

Post by **OnoSendai** » Thu Apr 05, 2007 10:07 pm

lowering the scattering coefficient lowers the probability of scattering, the scattered light radiance, and the average number of times a ray is scattered.

mrCarnivore · Post by **mrCarnivore** » Thu Apr 05, 2007 11:01 pm

So the effect that happens is that the sss coeff is very low, but the light is soooo bright, that the visible ray is still quite visible although most of the rays only got scattered once if at all...

I will try that. Thx!

Post by **OnoSendai** » Thu Apr 05, 2007 11:13 pm

Yeah, you got it!

Kram1032 · Post by **Kram1032** » Fri Apr 06, 2007 1:08 am

For making the ray visible, it would be cool to have a random scratering coefficient

uniformal isn't quite realistic, for, say, a bar full of smoke...