The external compositing tag is only going to give you coordinate data for a single null (animated or not) from C4D. What it sounds like you are trying to do is actually retexture a surface inside of AE and to do that you’ll need a 2D image that gives you more information about where those actual surfaces are in 3D space..and that’s a UV render pass. One way is to use the “Youveelizer” plugin for AE along with a UV render pass from C4D in order to re-texture inside of AE. You’ll need to render your UV pass at at least 16bpc and work in AE at either 16bpc or 32bpc. Maltaannon has a great tutorial about it here.
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