From e8cd4cd8f9a6cfdb5ba2cf9eec044b08b1f3f176 Mon Sep 17 00:00:00 2001
From: Qianqian Fang <fangqq@gmail.com>
Date: Wed, 13 Mar 2024 00:37:42 -0400
Subject: [PATCH] [bug] further fix of multi-source replay, #215

---
 src/mcx_core.cu | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/mcx_core.cu b/src/mcx_core.cu
index aa52ca87..f70505a9 100644
--- a/src/mcx_core.cu
+++ b/src/mcx_core.cu
@@ -1153,6 +1153,10 @@ __device__ inline int launchnewphoton(MCXpos* p, MCXdir* v, Stokes* s, MCXtime*
         }
     }
 
+    if (gcfg->issaveseed) {
+        copystate(t, photonseed);
+    }
+
     if (gcfg->extrasrclen && gcfg->srcid != 1) {
         if (gcfg->srcid > 1) {
             launchsrc = (MCXSrc*)(gproperty + gcfg->maxmedia + 1 + gcfg->detnum + ((gcfg->srcid - 2) * 4));
@@ -1177,10 +1181,6 @@ __device__ inline int launchnewphoton(MCXpos* p, MCXdir* v, Stokes* s, MCXtime*
         *idx1d = *((uint*)&launchsrc->param2.z);      /**< pre-computed 1D index of the photon at launch for pencil/isotropic beams */
         *mediaid = *((uint*)&launchsrc->param2.w);    /**< pre-computed media index of the photon at launch for pencil/isotropic beams */
 
-        if (gcfg->issaveseed) {
-            copystate(t, photonseed);
-        }
-
         *rv = float3(launchsrc->pos.x, launchsrc->pos.y, launchsrc->pos.z); //< reuse as the origin of the src, needed for focusable sources
 
         if (issvmc) {