Fluid Source qL SOP

[johnnyquest]

Same functionality and parameters as the original (so it'd be replaceable)

• full VDB-based, without old volume bottlenecks
• better adjustable visualization for each volume (additional volume vis sop)
• ...

orig OP bottlenecks:

• volume velocity
• ...

other issues with original OP:

• velocity display slows it down even if it's not used -> should be a guide?
• too many parameters -- should be way more simple
• ...

source funcs:

• source
• sink
• pump
• collide
• expand

UPDATE: all source funcs seem to be working

[johnnyquest]

phase 2:

• rework UI so it'd be a bit more "logical"
  • (scalar volume method should be named "SDF/VDB from geometry")
• a fast, general-purpose motion blur method should be added that works both for scalar and velocity volumes
• motion blur should be DOP substep-aware (this won't help with pyro internal substepping, but at least it's something)
• all visualizations should be guide geometry (i.e. scalar "slice" vis.)

what's slow or doesn't work:

• any Volume VOP-based stuff in general is slow
• velocity curl noise doesn't work (it's a separate asset)
• "scale by source attribute" is annoyingly slow
• ...

todo:

• global "value scale" parameter [0..1]
  • toggle for scalars and velocities: "affect by global scale" (i.e. velocity volumes are usually masked by scalars already)
  • should output an empty geometry if (global) value scale is zero
• velocity curl noise should be applied to geometry then converted to VDB (as opposed to a Volume VOP, which is dead slow)
• scalars: "scale by source attrib" should work both with vdb-from-polygons and vdb-from-points methods (create another field with the attrib and mult them together)
• "volume sample" mode: voxel size / size reduction % doesn't work
• ...

[johnnyquest]

IMPORTANT TODO: EMPTY INPUT -- NO OUTPUT! :o