I was testing the samples to load and render .obj files with Java3D and they seemed to work well. I am looking for a way to render the 3D models contained in PDF which are stored in either U3D or PRC format. Is Java3D support limited to .obj files? Does anyone have any suggestions on how to render U3D or PRC using Java3D?
In my humble opinion, you'll have an hard time looking for importers for those formats, Collada and GLTF are more widely supported nowadays. Java3D support isn't limited to OBJ files, you can find third party loaders in some other formats.