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undream

Particle Birth Matte ?

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Hi there. Here is another after effects question.

 

I'm looking for a way to "give birth" to particles on a certain layer.

I mean, I want to use a luminance matte (or an alpha matte) to create particles (particles will be created at white areas).

 

I have trapcode2. And AECS4.

 

Any ways to do this ?

 

 

Thanks.

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Doing this from memory, but:

 

You want to change the particle emitter from Point to Layer. This lets you choose a layer to use as a source, just like you say. If I'm remembering rightly, it only works on alpha, but you can easily get your luma matte to an alpha matte. Then just select this layer as your source, and particles will appear randomly within the alpha of it. Tada!

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Whoops, sorry - I meant, in Trapcode Particular. Open the Emitter settings, then the second choice is Emitter Type. Change this to Layer, and then select the layer you want in the Layer dropdown right beneath that.

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