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Authored by Sergey Sharybin (sergey) on Mar 9 2018, 4:00 PM.
diff --git a/intern/cycles/kernel/geom/geom_volume.h b/intern/cycles/kernel/geom/geom_volume.h
index 286d898992e..346f228e961 100644
--- a/intern/cycles/kernel/geom/geom_volume.h
+++ b/intern/cycles/kernel/geom/geom_volume.h
@@ -68,7 +68,7 @@ ccl_device float3 volume_attribute_float3(KernelGlobals *kg, const ShaderData *s
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
- if(r.w != 0.0f && r.w != 1.0f) {
+ if(r.w > 1e-6f && r.w != 1.0f) {
/* For RGBA colors, unpremultiply after interpolation. */
return float4_to_float3(r) / r.w;
}

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Sergey Sharybin (sergey) created this paste.Mar 9 2018, 4:00 PM
Sergey Sharybin (sergey) created this object with edit policy "Administrators".
Sergey Sharybin (sergey) mentioned this in T54278: Cycles volume artifacts after pre-multiplication commit.