1 files changed, 6 insertions, 0 deletions
diff --git a/intern/cycles/kernel/closure/bsdf_refraction.h b/intern/cycles/kernel/closure/bsdf_refraction.h
index 88497525960..862e774da87 100644
--- a/intern/cycles/kernel/closure/bsdf_refraction.h
+++ b/intern/cycles/kernel/closure/bsdf_refraction.h
@@ -23,6 +23,7 @@ ccl_device float3 bsdf_refraction_eval_reflect(ccl_private const ShaderClosure *
                                                const float3 omega_in,
                                                ccl_private float *pdf)
 {
+  *pdf = 0.0f;
   return make_float3(0.0f, 0.0f, 0.0f);
 }
 
@@ -31,6 +32,7 @@ ccl_device float3 bsdf_refraction_eval_transmit(ccl_private const ShaderClosure
                                                 const float3 omega_in,
                                                 ccl_private float *pdf)
 {
+  *pdf = 0.0f;
   return make_float3(0.0f, 0.0f, 0.0f);
 }
 
@@ -82,6 +84,10 @@ ccl_device int bsdf_refraction_sample(ccl_private const ShaderClosure *sc,
     *domega_in_dy = dTdy;
 #endif
   }
+  else {
+    *pdf = 0.0f;
+    *eval = make_float3(0.0f, 0.0f, 0.0f);
+  }
   return LABEL_TRANSMIT | LABEL_SINGULAR;
 }