Usd statbook5/17/2023 ![]() ![]() This means that a standard USD or USDZ file exported according to the official specifications will not load into Apple software, or if it does, it likely will look incorrect, especially with regards to materials. Unfortunately, the Apple implementation of USDZ’s feature is very partial with a large set of undocumented limitations. In particular, the most common software that supports USDZ outside of the Pixar studios belongs to Apple. ![]() Unfortunately, outside of Pixar Animation, the world isn’t so perfect. It is quite likely that inside of Pixar Animation Studios, USD files are perfectly compatible between their various internal tool sets. Binary formats can often be complex if you need to read and write to them directly, but the USD SDK hides this completely from the user of the USD SDK. It is also efficient in terms of space, because binary representations of numbers take up less space than human-readable numbers. This is because when you store data as binary, it is faster to write and read it, as opposed to a text-based format that must convert binary data to and from human readable numbers. The USD file format, because it utilizes an efficient binary encoding, is fast to write and read. This is great for high-quality modeling tools, and enables complex features like accurate subdivision surfaces. It also does not have legacy baggage of features that used to be popular decades ago but generally are not used today, like FBX’s support for NURBS surfaces Separate Position, UV and Normal TopologiesĪ strength of the USD and USDZ 3D file formats is that they enable the storage of position, UV, and normal data that have different topology. USD supports the latest physically-based material and lighting definitions. Pixar Animation is the leading 3D animation studio, and its design for USD is nearly perfect for its needs. The most unique strength of the USD file format in comparison to all other 3D interchange formats is that its supported features are very modern. If you have data in a 3D editor that you want to transfer to another tool, it is very likely that USE and USDZ (if supported by your application) will be able to transfer that data accurately and easily. USD and USDZ supports 3D models, scene hierarchy, materials, lighting, animations, bones, skinning, and blend shapes. The USD and USDZ formats, like the FBX file format, supports a rich and wide set of features. It wasn’t until Apple decided to adopt USDZ as its primary file format for all things 3D that USD became popular with everyday users. USD was originally designed to be used by professionals in the visual effects and computer animation industry for transferring around 3D scene information between different software tools. The less popular USDA extension variation means that it is a human readable text format, whereas the main USD and USDZ variations are binary encoded. While the USDZ extension variation just means that it is a zip-compressed USD file, hence the Z in the name. The USD acronym stands for Universal Scene Description. The USD, USDZ and USDA 3D file formats are three different names for a format designed by Pixar Animation for the transfer of rich 3D models and scenes. Ben Houston's Ultimate Guide to 3D File Formats ![]() If you're wondering whether you should use the USD, USDZ and USDA 3D file formats, the answer is that it depends on what you're using it for. Should you use the USD and USDZ 3D file formats? ![]()
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