a texture mapping system developed by Walt Disney Animation Studios for production-quality rendering. Supports Catmull-Clark subdivision surfaces (including quad and non-quad faces), Loop subdivision surfaces, and polymeshes (either all-quad or all-triangle). Several data types are supported including 8 or 16-bit integer, float, and half-precision float. An arbitrary number of channels can be stored in a Ptex file. Arbitrary meta data can be stored in the Ptex file and accessed through the memory-managed cache.