Just use a projection node also making sure you have Zbuffer on. You can also accomplish this using a diffuse node and turning on projection there. The latter is better because this will allow you to use as a material if you want to apply lighting for any reason. You can then render out the albedo, reflection, spec and matte pass and apply to an additional Action node, comp node for further processing. Hope this helps
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Give this script a try:
It will setup either diffuse or projector projections with one click.
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