from “About vector graphics and raster images”:
“Some images are created as vector graphics in another application but are converted to pixels (rasterized) when they are imported into After Effects. If a layer is continuously rasterized, After Effects reconverts the vector graphics to pixels when the layer is resized, preserving sharp edges. Vector graphics from SWF, PDF, EPS, and Illustrator files can be continuously rasterized.”
Did you turn continuous rasterization on for the layer?
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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