Fluid: Updated Mantaflow source files

This update introduces two improvements from the Mantaflow repository:

(1) Improved particle sampling:
- Liquid and secondary particles are sampled more predictably. With all parameters being equal, baked particles will be computed at the exact same position during every bake.
- Before, this was not guaranteed.

(2) Sparse grid caching:
- While saving grid data to disk, grids will from now on be saved in a sparse structure whenever possible (e.g. density, flame but not levelsets).
- With the sparse optimization grid cells with a value under the 'Empty Space' value (already present in domain settings) will not be cached.
- The main benefits of this optimization are: Smaller cache sizes and faster playback of simulation data in the viewport.
- This optimization works 'out-of-the-box'. There is no option in the UI to enable it.
- For now, only smoke simulation grids will take advantage of this optimization.

1 files changed, 1 insertions, 0 deletions

diff --git a/intern/mantaflow/intern/MANTA_main.cpp b/intern/mantaflow/intern/MANTA_main.cpp
index fef6399ab23..d49915e2452 100644
--- a/intern/mantaflow/intern/MANTA_main.cpp
+++ b/intern/mantaflow/intern/MANTA_main.cpp
@@ -871,6 +871,7 @@ void MANTA::initializeRNAMap(FluidModifierData *fmd)
   mRNAMap["CACHE_DIR"] = cacheDirectory;
   mRNAMap["COMPRESSION_OPENVDB"] = vdbCompressionMethod;
   mRNAMap["PRECISION_OPENVDB"] = vdbPrecisionHalf;
+	mRNAMap["CLIP_OPENVDB"] = to_string(fds->clipping);
   mRNAMap["PP_PARTICLE_MAXIMUM"] = to_string(fds->sys_particle_maximum);
 
   /* Fluid object names. */