[Soc-2017-dev] Weekly Report #07 - Mantaflow Particles and Fluid Guiding

[Sebastián Barschkis]

Hello everyone,

here are a few notes on what happened this week:

https://wiki.blender.org/index.php/User:Sebbas/GSoC_2017/Reports/Week_7

= Week 7 =

This week I extended the secondary particle sampling and added support for
float particles. I also took care of a bug and added inital velocity
support for smoke.

=== What's been done ===

* So far I hadn't really touched the "Initial velocity" settings from the
flow source menu. So I started off with smoke and implemented a first
version. Results look promising and similar to the one from the master
branch. Initial velocity for liquids is slightly more complicated. (For
liquids you'd have to set the initial velocity to a whole volume of
particles, however, the smoke UI is more suited for planes with just one
normal). I will come back to this later.

* There was (and still is to some extent) a problem with domains that have
outflow cells. Liquid particles weren't deleted correctly and in some
situations liquid simulations appeared to have too much velocity. With the
help of Nils and many example scenes (thanks guys!) I managed to get the
outflow problem under control. What's left are velocities. I experimented a
bit and it seems there is too much velocity extrapolation before and after
the pressure solve.

* I added float particle support to the seconday particle sampling routine.
Tracers remain a todo, however, there is now also "Bubble" particles! For
now, here is a simulation of those floats and bubbles in Mantaflow. (In
Blender these new files are unstable, I am still hunting the bug).

* On the Blender side, everything is now set for float, tracer, bubble
particles. That includes UI, automatic particle system setup and caching. I
just have to tranfer the Mantaflow code and uncomment some lines.

=== Next up ===

* Get my Mantaflow code working in Blender again.

* Add support for tracer particles.

* Take more care of the Github bug. Again, outflow should be fixed,
velocities are still off. Fixing this bug has high priority.

=== Questions ===

* No

Best wishes,
Sebastián
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