Volumen Causic

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 12:33 am

After some tests I give up hope....
Does anyone knows how to render a Volume Caustic with indigo.
Here are my settings and my (bad) result.

Kram1032 · Post by **Kram1032** » Fri Apr 13, 2007 12:41 am

first: you should use specular if this shall be a perfect mirrior

2nd:The ball in the middle is the SSSball?
You should make it as big as possible, I guess...
It should be a .sphere and the cam should be inside the sphere.

PLEASE add a screen of your balls settings

the SSSmat is important.

It doesn't look bad, btw.
I don't really think, that anything is wrong, but you need more time

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 12:55 am

Here is another screen shot.
The Ball is Spec Material and Iro 1.5 (Glass) transp activated.
The Plane should be a mirror (with Phong settings).

Post by **OnoSendai** » Fri Apr 13, 2007 12:56 am

What kind of caustics are you trying to achieve?

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 1:10 am

Caustics like that:

http://www2.indigorenderer.com/joomla/i ... emId=10409

now it looks much better. But I've still no caustic "behind" the Glass Sphere

Kram1032 · Post by **Kram1032** » Fri Apr 13, 2007 1:31 am

I guess, you may should give the whole thing in a room, where all the rays can be reflected -> faster clear up.
Your's is somewhere in the void

CTZn · Post by **CTZn** » Fri Apr 13, 2007 1:40 am

I think the top light is far too weak in order to produce caustics, ans the glass ball might have a quasi null absorbtion: more absorbtion, less caustics. Ior is enough to make it visible.

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 1:55 am

now i render the whole thing inside a box.

On the Image there are also the rendersettings. Has anyone an Idea how to render more effectient.

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 5:07 am

I almost got it !!!

I've one last Problem: The LightRays ignore the Prisma Object.
There is no refraction (or reflection) or any of this Rainbow-Effects !?

Kram1032 · Post by **Kram1032** » Fri Apr 13, 2007 5:16 am

What's the IOR of the prisma?
IOR 1 means no refraction, nor reflection...
Dunno, what a prisma is supposed to have, as IoR...
But I GUESS, the higher the IoR, the less light goes through it, but the wider the angle of cbc is...

Post by **OnoSendai** » Fri Apr 13, 2007 5:17 am

Cool scene.. just give the prism an IOR like 1.7, and give it some cauchy b coefficient (dispersion) !

Sebastian · Post by **Sebastian** » Fri Apr 13, 2007 5:18 am

IOR is 2.75 so it HAS to deflect the Rays !

manitwo · Post by **manitwo** » Fri Apr 13, 2007 9:06 am

Kram1032 wrote:... where all the rays can be reflected -> faster clear up.

sorry ... no

Kram1032 · Post by **Kram1032** » Fri Apr 13, 2007 9:15 am

It shouldn't clear up fast, if EVERYTHING's reflected (white) but if a part is reflected, it should be ok.

In the void, many rays may just hit once nd don't get away much noise....

In a pure white room, as opposit, all the rays will be reflected as many times as you set them... THEN it also will need longer, as the computer let the ray bounce as many times as needed to get the limit. If you wouldn't define a limit (which can't be done anyway), you'd get an infinte loop and the first ray would fly though the scene for ever, without letting the computer start with the next one...
In that case, it should even need longer to clear up.

CTZn · Post by **CTZn** » Fri Apr 13, 2007 2:03 pm

Sebastian wrote:IOR is 2.75 so it HAS to deflect the Rays !

Are you sure the ray is passing through the prism, and not behind ? I guess everything is strictly parallel in your scene, but as the result is not what was expected...

That's odd, could you post the material settings for the prism (xml/igs wise) please ? There must be something wrong !

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