Is there a way to tessellate differently for each part of the model?

Hello @dongho.shin
There are few posts on the forum discussing how to traverse to PRC, for example this post may help in understanding how to get A3DRiRepresentationItem.
Or you can refer to the default sample PRC2XML for traversal or sample Viewer/MeshViewer. The API A3DRiRepresentationItemComputeTessellation is used in the sample.

Best Regards,
Man

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