Are both U3D and PRC supported by PDF3D?

Are both U3D and PRC supported by PDF3D?

Both U3D and PRC are available in PDF3D tools. U3D is available through an optimized implementation, including Right Hemisphere Compression extension for smaller file generation. PRC encoding, especially using the highly compressed tessellation methods (PRC-HCT) yield much higher compression rates than U3D, and are generally more efficient for complex scenes.