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, 7 insertions, 5 deletions

diff --git a/release/scripts/startup/bl_ui/properties_particle.py b/release/scripts/startup/bl_ui/properties_particle.py
index 3f672d2a977..75154550bcb 100644
--- a/release/scripts/startup/bl_ui/properties_particle.py
+++ b/release/scripts/startup/bl_ui/properties_particle.py
@@ -490,11 +490,13 @@ class PARTICLE_PT_physics(ParticleButtonsPanel, Panel):
             col.prop(part, "integrator", text="")
             col.prop(part, "timestep")
             sub = col.row()
-            if part.adaptive_subframes:
-                sub.prop(part, "courant_target", text="Threshold")
-            else:
-                sub.prop(part, "subframes")
-            sub.prop(part, "adaptive_subframes", text="")
+            sub.prop(part, "subframes")
+            supports_courant = part.physics_type == 'FLUID'
+            subsub = sub.row()
+            subsub.enabled = supports_courant
+            subsub.prop(part, "adaptive_subframes", text="")
+            if supports_courant and part.adaptive_subframes:
+                col.prop(part, "courant_target", text="Threshold")
 
             row = layout.row()
             row.prop(part, "use_size_deflect")