Chaos Corona Forum

General Category => Gallery => Topic started by: SilentPrayerCG on 2014-01-26, 08:34:45

Title: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 08:34:45: This is my PPM Caustic Test.
Inspired by this (http://corona-renderer.com/img/gallery/full/zipper-caustics.jpg)

Sad, that at the moment it isn't support dispersia and dont get color from absobtion.
Title: Re: PPM Caustic Test
Post by: Utroll on 2014-01-26, 08:50:18: wow !! footsteps of rays :)
Title: Re: PPM Caustic Test
Post by: Elviz on 2014-01-26, 09:52:34: This is so beautiful !

How one achieves such an effect ?
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 10:09:11: Quote from: Elviz on 2014-01-26, 09:52:34
This is so beautiful !

How one achieves such an effect ?

This is ortographic top projection of this scene. (i don't know how insert image from attachment in middle of post)

There is thin light source (full direct), that create a light beam. This emitter is tilted slightly down and create light path on floor by deflecting from colored mirror walls.

(Sorry if my english not well :( )
Title: Re: PPM Caustic Test
Post by: maru on 2014-01-26, 11:14:02: Nice. I never knew how it's done!
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 11:35:13: Quote from: maru on 2014-01-26, 11:14:02
Nice. I never knew how it's done!
Thx.
I think that image from gallery, was made a little differently. But i don't know exactly how.
Title: Re: PPM Caustic Test
Post by: Utroll on 2014-01-26, 12:56:51: Is it long to render ?

Because a rotation of the central prism would give a quite mesmerizing animation !! :)
Title: Re: PPM Caustic Test
Post by: Ondra on 2014-01-26, 12:58:59: light tracing should work better for this kind of scene
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 13:27:02: Quote from: Utroll on 2014-01-26, 12:56:51
Is it long to render ?

Because a rotation of the central prism would give a quite mesmerizing animation !! :)
About 15 hours.
I have pretty slow processor for Corona. Look at the render stamp.

Quote from: Keymaster on 2014-01-26, 12:58:59
light tracing should work better for this kind of scene
I will try.
But before i tried all engines for caustic, and only vcm and ppm give me a normal result. May be i do something wrong?
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 13:35:10: Quote from: Keymaster on 2014-01-26, 12:58:59
light tracing should work better for this kind of scene
I tried and lighttracer is working in this scene. What limitation of this engine?
Title: Re: PPM Caustic Test
Post by: Ondra on 2014-01-26, 13:53:10: It does not work for glossy objects
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 14:00:39: Quote from: Keymaster on 2014-01-26, 13:53:10
It does not work for glossy objects
As far as i understand PPM work with glossy dielectrics now very well to?

I planning make another image (not technical) and still dont know which engine i should use.
Title: Re: PPM Caustic Test
Post by: Ondra on 2014-01-26, 14:02:56: yep, it also works pretty bad. It can be improved to work reasonably well, but there is no point, since BDPT/VCM is so much better anyway.
Title: Re: PPM Caustic Test
Post by: SilentPrayerCG on 2014-01-26, 15:00:32: Quote from: Keymaster on 2014-01-26, 14:02:56
yep, it also works pretty bad. It can be improved to work reasonably well, but there is no point, since BDPT/VCM is so much better anyway.
Tell me about this VCM. It have limitations or some things / settings that I should know?