Liquid Simulation Display Options (GSoC 2020)

All the changes made in the branch `soc-2020-fluid-tools` are included in this patch.

**Major changes:**

=== Viewport Display ===

- //Raw voxel display// or //closest (nearest-neighbor)// interpolation for displaying the underlying voxel data of the simulation grids more clearly.
- An option to display //gridlines// when the slicing method is //single//.

==== Grid Display ====

- Visualization for flags, pressure and level-set representation grids with a fixed color coding based on Manta GUI.

==== Vector Display ====

- //**M**arker **A**nd **C**ell// grid visualization options for vector grids like velocity or external forces.
- Made vector display options available for external forces.

==== Coloring options for //gridlines// ====

- Range highlighting and cell filtering options for displaying the simulation grid data more precisely.
- Color gridlines with flags.

- Also, made slicing and interpolation options available for Volume Object.

Reviewed By: JacquesLucke, sebbas

Differential Revision: https://developer.blender.org/D8705

1 files changed, 2 insertions, 0 deletions

diff --git a/intern/mantaflow/extern/manta_fluid_API.h b/intern/mantaflow/extern/manta_fluid_API.h
index 124671467f7..6827ac35050 100644
--- a/intern/mantaflow/extern/manta_fluid_API.h
+++ b/intern/mantaflow/extern/manta_fluid_API.h
@@ -109,6 +109,8 @@ float *manta_get_phiobs_in(struct MANTA *fluid);
 float *manta_get_phiobsstatic_in(struct MANTA *fluid);
 float *manta_get_phiout_in(struct MANTA *fluid);
 float *manta_get_phioutstatic_in(struct MANTA *fluid);
+float *manta_get_phi(struct MANTA *fluid);
+float *manta_get_pressure(struct MANTA *fluid);
 
 /* Smoke functions */
 void manta_smoke_export_script(struct MANTA *smoke, struct FluidModifierData *fmd);