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This patch adds the ability to render motion blur from Alembic caches. The motion blur data is derived from a velocity attribute whose name has to be defined by the user through the MeshSequenceCache modifier, with a default value of ".velocities", which is the standard name in Alembic for the velocity property, although other software may ignore it and write velocity with their own naming convention (e.g. "v" in Houdini). Furthermore, a property was added to define how the velocity vectors are interpreted with regard to time : frame or second. "Frame" means that the velocity is already scaled by the time step and we do not need to modify it for it to look proper. "Second" means that the unit the velocity was measured in is in seconds and so has to be scaled by some time step computed here as being the time between two frames (1 / FPS, which would be typical for a simulation). This appears to be common, and is the default behavior. Another property was added to control the scale of the velocity to further modify the look of the motion blur. Reviewed By: brecht, sybren Differential Revision: https://developer.blender.org/D2388
.. 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 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.