58be9708bf
Remove need for shadow caustic caster geometry to have a UV layout. UVs were useful to maintain a consistent tangent frame across the surface while performing the walk. A consistent tangent frame is necessary for rough surfaces where a normal offset encodes the sampled h, which should point towards the same direction across the mesh. In order to get a continuous surface parametrization without UVs, the technique described in this paper was implemented: "The Natural-Constraint Representation of the Path Space for Efficient Light Transport Simulation" (Supplementary Material), SIGGRAPH 2014. In addition to implementing this feature: * Shadow caustic casters without smooth normals are now ignored (triggered some refactoring and cleaning). * Hit point calculation was refactored using existing utils functions, simplifying the code. * The max number of solver iterations was reduced to 32, a solution is usually found by then. * Added generalized geometry term clamping (transfer matrix calculation can sometimes get unstable). * Add stop condition to Newton solver for more consistent CPU and GPU result. * Add support for multi scatter GGX refraction. Fixes T96990, T96991 Ref T94120 Differential Revision: https://developer.blender.org/D14623
.. 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.