From 8536575263bc3138a69f3ab8f15cb5c6feedbc38 Mon Sep 17 00:00:00 2001
From: Weizhen Huang <weizhen@blender.org>
Date: Fri, 15 Mar 2024 13:00:23 +0100
Subject: [PATCH] Fix: Cycles area light ignores some valid samples in volume
 segment

---
 intern/cycles/kernel/light/area.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/intern/cycles/kernel/light/area.h b/intern/cycles/kernel/light/area.h
index 807ada0de03..eb03ca866ef 100644
--- a/intern/cycles/kernel/light/area.h
+++ b/intern/cycles/kernel/light/area.h
@@ -311,7 +311,7 @@ ccl_device_inline bool area_light_eval(const ccl_global KernelLight *klight,
     ls->pdf *= light_pdf_area_to_solid_angle(Ng, -ls->D, ls->t);
   }
 
-  return ls->eval_fac > 0;
+  return in_volume_segment || ls->eval_fac > 0;
 }
 
 template<bool in_volume_segment>