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Particle Volume - distortion of texture coordinates offset?

 
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Pitcher



Joined: 23 Mar 2005
Posts: 114
Location/Company/Country: Gimmick VFX/Denmark

PostPosted: Thu Nov 08, 2012 1:45 pm    Post subject: Particle Volume - distortion of texture coordinates offset? Reply with quote

Hi Holger

I have been playing with distorting texture coordinates in the Particle Volume shader with Ba Fractal and it seems it only distorts into positive values on the x, y and z axis, creating a sort of directional distortion. I tried changing the BA Fractal values from 0 - 1 to -0.5 - 0.5, but that didn't work. I also tried remapping the values with Scalar Change Range, but still no luck. Am I missing a part of the workflow here, or what?

One other thing - how do I use the particles texture coordinates as coordinate system for the distortion?

Thanks
Morten Bartholdy
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Morten Bartholdy
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schoenberger
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Joined: 02 Mar 2005
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PostPosted: Thu Nov 08, 2012 4:54 pm    Post subject: Reply with quote

Hi

>I tried changing the BA Fractal values from 0 - 1 to -0.5 - 0.5, but that didn't work.
That should work.

>creating a sort of directional distortion
If you use fractal_scl, then you have only one direction.
Like scaling an object in X/Y/Z at the same time.

Use a colored RGB=>XYZ shader.
Use baFractal4D and set the first color to RGB -1 -1 -1.


>One other thing - how do I use the particles texture coordinates as coordinate system for the distortion?
Hmm, there was an example scene, but I do not find it right now.
The solution was to create a second sim. Same forces, but only a few very large particles to completely cover your first sim. And the second sim has a very small overlapping of these new large particles within themselves.
Then use second particle_density, select the other particles via their ID and pipe the color into the distortion.
(see XSI samples ICE_fireworks for ID selection)
Apply baFractal4D as color shader for the second particles.
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Holger Schönberger
Binary Alchemy - digital materialization
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Pitcher



Joined: 23 Mar 2005
Posts: 114
Location/Company/Country: Gimmick VFX/Denmark

PostPosted: Sat Nov 10, 2012 11:27 am    Post subject: Reply with quote

Thanks Holger

I will try your suggestions Smile

Morten
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Morten Bartholdy
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