How to render houdini particles like force additive mode of krakatoa

something like in the link below.

http://vimeo.com/21972829 [vimeo.com]

thanks for the help in advance

This video is really beauty , But I think particle's simulation is more important than it's rendering with karkatoa ! :?

If you make it's simulation , maybe you can take same result with some Glow and perfect motion blur in compositing ! :?

You can use opacity trick (set Opacity to low and compensate it in Color and after render clamp Alpha channel).

Or you can use similar Emission trick as Krakatoa (what I understood from the online documentation). This method gives you same result but it's much faster to setup:

1. Use Mantra Surface shader.
2. Turn everything off except Emission (so “Enable Diffuse”, and “Enable Reflect” should be off“, and ”Enable Emission“ on).
3. Set ”Emission Color“ that way that no channel is equal to zero, (if you need more or less pure red set green and blue channel to very small value like 0.001).
This small value determines how fast it goes to the very bright (super white) color.
4. Set ”Opacity Scale“ to 0 for full ”additive" effect (and 1 is for no additive effect) (you need to render correct (desired) Alpha/Opacity in separate pass (with different material))

5. Enjoy

Cheers, P.Z.

one way is glow shader.

chevita.
one way is glow shader.

Yes , I think so , That's perfect. 8)

yep

the other way is glow in post

pezetko
You can use opacity trick (set Opacity to low and compensate it in Color and after render clamp Alpha channel).

Or you can use similar Emission trick as Krakatoa (what I understood from the online documentation). This method gives you same result but it's much faster to setup:

1. Use Mantra Surface shader.
2. Turn everything off except Emission (so “Enable Diffuse”, and “Enable Reflect” should be off“, and ”Enable Emission“ on).
3. Set ”Emission Color“ that way that no channel is equal to zero, (if you need more or less pure red set green and blue channel to very small value like 0.001).
This small value determines how fast it goes to the very bright (super white) color.
4. Set ”Opacity Scale“ to 0 for full ”additive" effect (and 1 is for no additive effect) (you need to render correct (desired) Alpha/Opacity in separate pass (with different material))

5. Enjoy

Cheers, P.Z.

Thanks… It worked like a charm…