Patches to Bf Blender for CAD development.
https://tornavis.org/
6951e8890a
This commit is a big overhaul to the Mikktspace module, which is used to compute tangents. I'm not calling it a rewrite since it's the result of a lot of iterations on the original code, but pretty much everything is reworked somehow. Overall goal was to a) make it faster and b) make it maintainable. Notable changes: - Since the callbacks for requesting geometry data were a big bottleneck before, I've ported it to C++ and made it header-only, templating on the data source. That way, the compiler generates code specific to the caller, which allows it to inline the data source and specialize for some cases (e.g. subd vs. non-subd in Cycles). - The one input parameter, an optional angle threshold, was not used anywhere. Turns out that removing it allows for considerable algorithmic simplification, removing a lot of the complexity in the later stages. Therefore, I've just removed the option in the new code. - The code computes several outputs, but only one (the tangent itself) is ever used in Blender. Therefore, I've removed the others to simplify the code. They could easily be brought back if needed, none of the algorithmic simplifications are conflicting with them. - The original code had fallback paths for many steps in case temporary memory allocation fails, but that never actually gets used anyways since malloc() doesn't really ever return NULL in practise, so I removed them. - In general, I've restructured A LOT of the code to make the algorithms clearer and make use of some C++ features (vectors, std::array, booleans, classes), though there's still some of cleanup that could be done. - Parallelized duplicate detection, neighbor detection, triangle tangent computation, degenerate triangle handling and tangent space accumulation. - Replaced several algorithms with faster equivalents: Duplicate detection uses a (concurrent) hash set now, neighbor detection uses Radixsort and splits vertices by index pairs etc. As for results, the exact speedup depends on the scene of course, but let's consider the file from T97378: - Blender 3.1 (before D14675): 6.07sec - Blender 3.2 (with D14675): 4.62sec - rBf0a36599007d (last nightly build): 4.42sec - With this commit: 0.90sec This speedup will mostly be noticed at the start of Cycles renders and, even more importantly, in Eevee when doing something that changes the geometry (e.g. animating) on a model using normal maps. Differential Revision: https://developer.blender.org/D15589 |
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readme.rst
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.