track matte for effects


hi. have rendered animation in cinema 4d , have alpha channel in passes. want use alpha create track matte. can image can't figure out how use constrain effect specific area. have ball , alpha channel it, , want adjust levels on ball leave background is. help.

duplicate layer gets effect.  apply effect uppermost instance of layer.  use c4d layer either alpha or alpha inverted matte uppermost layer.  done.



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