Fluid: Added obstacle fluid distance parameter

Being able to adjust the distance between fluid and obstacles comes in handy when trying to achieve a fluid motion over inclined obstacles.

Depending on the slope of such obstacles, already small adjustments of this value can help when particles stick to obstacle surfaces (i.e. make particles not stick to obstacles).

1 files changed, 11 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_fluid.c b/source/blender/makesrna/intern/rna_fluid.c
index 84187786c46..60eed60ace1 100644
--- a/source/blender/makesrna/intern/rna_fluid.c
+++ b/source/blender/makesrna/intern/rna_fluid.c
@@ -1895,12 +1895,22 @@ static void rna_def_fluid_domain_settings(BlenderRNA *brna)
   RNA_def_property_range(prop, 0.001, 1.0);
   RNA_def_property_ui_range(prop, 0.01, 1.0, 0.05, -1);
   RNA_def_property_ui_text(prop,
-                           "Obstacle-Fluid Threshold",
+                           "Obstacle Threshold",
                            "Determines how much fluid is allowed in an obstacle cell "
                            "(higher values will tag a boundary cell as an obstacle easier "
                            "and reduce the boundary smoothening effect)");
   RNA_def_property_update(prop, NC_OBJECT | ND_MODIFIER, "rna_Fluid_datacache_reset");
 
+  prop = RNA_def_property(srna, "fractions_distance", PROP_FLOAT, PROP_NONE);
+  RNA_def_property_range(prop, -5.0, 5.0);
+  RNA_def_property_ui_range(prop, 0.01, 5.0, 0.1, -1);
+  RNA_def_property_ui_text(prop,
+                           "Obstacle Distance",
+                           "Determines how far apart fluid and obstacle are (higher values will "
+                           "result in fluid being further away from obstacles, smaller values "
+                           "will let fluid move towards the inside of obstacles)");
+  RNA_def_property_update(prop, NC_OBJECT | ND_MODIFIER, "rna_Fluid_datacache_reset");
+
   prop = RNA_def_property(srna, "sys_particle_maximum", PROP_INT, PROP_NONE);
   RNA_def_property_int_sdna(prop, NULL, "sys_particle_maximum");
   RNA_def_property_range(prop, 0, INT_MAX);