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2018-06-28T21:22:38Z

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2017-06-09T22:48:02Z

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= Week 2 =

This week was a great success. Besides smaller UI improvements I managed to get FLIP particles into the viewport.

=== What's been done ===

* As one of the goals of this GSoC is also to get closer to the master branch integration, I took care of a UI shortcoming. Previously there was only the option to set domain borders according to a few textual descriptions (e.g. all open, just vertically open). This is a bit limiting and so I implemented a "check box" layout. ({{GitCommit|rB0a4750a65876}})

* Cleanup in the cache. The introduction of multiple domain support broke some of the file loading. I fixed this and now caching should continue even if the playback was reset in between. Files names also look a bit nicer now. ({{GitCommit|rB1c1e99363d9b}})

* Console output cleanup (it had gotten to a point where the output was slowing down the simulation ...). ({{GitCommit|rB50e351e6e094}}, {{GitCommit|rB152e58dff166}})

* The particle API that I worked on last week turned out to be a good foundation. The file IO worked correctly, I only needed to adjust particle positions (scale and translate them to match Blender world coordinates). After some fine-tuning (removing dead Mantaflow particles), I finally got them to show up in the viewport. So now, for your liquid simulations you can choose between caching FLIP particles or meshes! ({{GitCommit|rB35c99918f4b1}}, {{GitCommit|rBe9e41421a64c}}, {{GitCommit|rBbdd845c42d40}}, {{GitCommit|rBc410bb71f2fd}})

[[File:Mantaflow_bunny_particle.gif|center|thumb|6400px|FLIP particles inside Blender viewport]]

=== Next up ===

* I would like to improve the FLIP particle option a bit:
** Add an option to have mesh and FLIP particles both at the same time.
** Add an option to control the Narrow-Band width. This way you will be able to control the amount of particles. It's especially useful for scenes where you not only want a surface with particles but the entire volume filled up.
** Take care of particle caching with liquid high-res option enabled.
** Import particle velocities. Mantaflow stores them in a separate array which I need to save and load (<tt>.uni</tt> files) similarly to the actual particle system.

* I discussed with Nils how to approach the secondary particles (tracer, drop, float). As a first step, I will experiment with an additional particle system in Mantaflow. This system will act as a "droplet" generator: Whenever a cell exceeds a predetermined threshold velocity, a new particle should be created and initialized there (i.e. set location and copy velocity from underlying velocity grid).

* Once particle generation works, I can apply velocities and external forces on them (advection step, add gravity). All in all, this setup should create first Mantaflow secondary particle effects.

* Since this setup is experimental, I'll first build a working prototype in Mantaflow. I can later transfer it to Blender.

=== Questions ===

* No

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