1 files changed, 4 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_particle.h b/source/blender/blenkernel/BKE_particle.h
index 5b565223ece..c417b1efe4f 100644
--- a/source/blender/blenkernel/BKE_particle.h
+++ b/source/blender/blenkernel/BKE_particle.h
@@ -80,6 +80,10 @@ typedef struct ParticleSimulationData {
 	struct ParticleSystem *psys;
 	struct ParticleSystemModifierData *psmd;
 	struct ListBase *colliders;
+	/* Courant number. This is used to implement an adaptive time step. Only the
+	   maximum value per time step is important. Only sph_integrate makes use of
+	   this at the moment. Other solvers could, too. */
+	float courant_num;
 } ParticleSimulationData;
 
 typedef struct ParticleTexture{