Commit: d0c6f14c73473579885ed0658dca3e3b6559ad2f
Author: Brecht Van Lommel
Date:   Thu Jan 2 21:33:04 2014 +0100
https://developer.blender.org/rBd0c6f14c73473579885ed0658dca3e3b6559ad2f

Fix T38033: cycles volume emission changes with step size.

===================================================================

M       intern/cycles/kernel/kernel_volume.h

===================================================================

diff --git a/intern/cycles/kernel/kernel_volume.h 
b/intern/cycles/kernel/kernel_volume.h
index d0eb6dda..6533319 100644
--- a/intern/cycles/kernel/kernel_volume.h
+++ b/intern/cycles/kernel/kernel_volume.h
@@ -300,7 +300,7 @@ ccl_device VolumeIntegrateResult 
kernel_volume_integrate_heterogeneous(KernelGlo
                                        emission.z *= (sigma_a.z > 0.0f)? (1.0f 
- attenuation.z)/sigma_a.z: dt;
                                }
                                else
-                                       emission *= t;
+                                       emission *= dt;
 
                                path_radiance_accum_emission(L, tp, emission, 
state->bounce);
                        }

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