From baef6f20c2cbc30b5c516c40bfc22cba1a4c3979 Mon Sep 17 00:00:00 2001
From: jacksonmj <mj-pt@jacksonmj.co.uk>
Date: Sat, 17 Sep 2011 03:46:25 +0800
Subject: Fix disappearing particles, e.g. with a box of CONV (ctype DEUT)
 containing neutrons


diff --git a/src/powder.c b/src/powder.c
index 0854217..d307f39 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -804,7 +804,15 @@ inline int create_part(int p, int x, int y, int tv)//the function for creating a
 		pfree = parts[i].life;
 	}
 	else
+	{
+		int oldX = (int)(parts[p].x+0.5f);
+		int oldY = (int)(parts[p].y+0.5f);
+		if ((pmap[oldY][oldX]>>8)==p)
+			pmap[oldY][oldX] = 0;
+		if ((photons[oldY][oldX]>>8)==p)
+			photons[oldY][oldX] = 0;
 		i = p;
+	}
 
 	if (i>parts_lastActiveIndex) parts_lastActiveIndex = i;
 
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