Color by velocity, without rendering PRT

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  06 June 2012
Color by velocity, without rendering PRT

I'm working on a big project that has been saving out particle sequences as PRT files, in order to save the Velocity channel and render in Krakatoa. I am using the velocity channel to apply a gradient ramp and color the particles based on their velocity/speed.

It would be incredibly beneficial if this was possible to do - color particles based on velocity or speed - without having to render a PRT sequence for every scene, as it is quite time consuming.

Is there a way to apply a gradient ramp of colors to particles, using the velocity channel, and then render with krakatoa, without first rendering out a PRT sequence?
  06 June 2012
You can apply a global kcm that would do the job. Look it up in the documentation

And, we should start having FX meetups in Stanley park
  06 June 2012
Will take a look at that Glacier, thanks!

And absolutely we should! I know Bobo, from Thinkbox, lives here in Vancouver as well.
  06 June 2012
I'm not sure if I'm doing it right - but I've managed to get my particles, from what I can tell, to take on my gradient ramp based on what I hope is their velocity, using a KCM Global Color override with my gradient ramp fed as the map channel.

Edit: I used the same Magma Editor flow as with my PRT Sequences, basically Velocity > Magnitude > Divide > Curve > Vector > Mapping Channel (Gradient). Not sure if this is necessary, but it seems to be working so I don't want to change anything.

As far as I can tell - complete success.

Thanks again!

Last edited by Eucalyptus : 06 June 2012 at 08:16 PM.
  06 June 2012
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