Uses a map (can be a
Shared Element
A shared element that can be reused at several places like an After Effects precomposition
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too). To color each vertex based on its UV.
To use this modifier over a particle set, either emit particles from a geometry or use a
UV Mapping
Remap UV of a mesh using simple mappings (Cylindrical / planar / orthographic / perspective)
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.
As you'll see on the example below, that is what mean "per vertex color".
On a low subdivided plane (10x10) you'll get something like that :
On a medium subdivided plane (64x64), you'll get something like that :
This modifier is so particularly effective over a particles system. You can use a
Video Input
Extract the image from a Video Input Device
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as a map to colorize your particles with what comes out of your webcam.
You can also try to combine it with
Layer Intensity
Field where particles move toward a certain color in a 2D layer
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or
Normal Map Layer
Field based on a Normal Map
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+
Optical Flow
Use image feedback to convert movement to rgb colors
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for a maximum funky fresh effect to the over top.
Here is a tutorial example using this modifier :