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Is it possible to have a particle system emit particles based on the alpha channel of a texture? I would need to emit particles only from the parts of an image texture that are not transparent.

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you can add texture to the particle system :

enter image description here

then change the influence from time to density in the texture tab :

enter image description here

in the texture tab you can change the mapping, enable/disable Alpha ; by default it will use the alpha channel and emit from the non transparent part

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