Can now set a lower bound on the number of subframes (i.e. an upper bound on the time step size) for fluid simulations. Previously, the "subframes" parameter was not available when the adaptive time step was enabled; now they can both be set. The two settings can be used together to greatly increase simulation stability.

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/makesrna/intern/rna_particle.c b/source/blender/makesrna/intern/rna_particle.c
index 6825d3d781d..96b6197cf69 100644
--- a/source/blender/makesrna/intern/rna_particle.c
+++ b/source/blender/makesrna/intern/rna_particle.c
@@ -2129,11 +2129,11 @@ static void rna_def_particle_settings(BlenderRNA *brna)
 	RNA_def_property_update(prop, 0, "rna_Particle_reset");
 
 	prop = RNA_def_property(srna, "courant_target", PROP_FLOAT, PROP_NONE);
-	RNA_def_property_range(prop, 0.01, 10);
-	RNA_def_property_float_default(prop, 0.2);
+	RNA_def_property_range(prop, 0.0001, 10);
+	RNA_def_property_float_default(prop, 0.1);
 	RNA_def_property_ui_text(prop, "Adaptive Subframe Threshold",
 	                         "The relative distance a particle can move before requiring more subframes "
-	                         "(target Courant number); 0.1-0.3 is the recommended range");
+	                         "(target Courant number); 0.01-0.3 is the recommended range");
 	RNA_def_property_update(prop, 0, "rna_Particle_reset");
 
 	prop = RNA_def_property(srna, "jitter_factor", PROP_FLOAT, PROP_NONE);