Particles fueled by greenscreen?

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  06 June 2013
Particles fueled by greenscreen?


I'm working a sci fi film where I'm trying to have particles form into a person. I attached the green screen footage to a plane with an image sequence and set as a goal. I'm having trouble controlling the flow of the particles. I tried using an automated ramp as opacity map and using the footage as a texture color for the particles. Any ideas or tips would be appreciated. Thanks in advance.

  06 June 2013
Perhaps you might find it easier to emit from the green screen image(textured emission rate) with the image sequence reversed then playback your finished animation in reverse.
  06 June 2013
Good idea. Thanks. Ill give it a go. I'm having a hard time applying file node color(texture) to drive the color of nparticle. I dropped the file image sequence into the texture rate and clicked the box enable texture rate. It sets the particles to the keyed out movement of actress but I'm having a hard time getting the color of her clothes, skin, etc. to transfer to particle color. Am I missing a step? I'm scouring the web looking for tutorials. Still a newbie
  06 June 2013
The default nParticle setup has rgbPP connected to by the internalColorRamp. If you just rightMouse over rgbPP in the Per Particle Attributes and do break connection it should work fine.

You could also instead set colorInput to constant, which breaks the connection, but it also deletes the rgbPP attribute so you would then need to also recreate it( Add Dynamic Attributes, color button).

This all assumes you've also mapped particleColor on the emitter and enabled inheritColor.
  06 June 2013
Thanks Duncan. Yeah I forgot to enable color. I appreciate it.
  06 June 2013
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