From 65445c51f11d9f7d0db626c0797a622294da67ce Mon Sep 17 00:00:00 2001
From: jacksonmj <mj-pt@jacksonmj.co.uk>
Date: Mon, 29 Aug 2011 01:25:18 +0800
Subject: Fix rapid decrease in pressure with GAS/NBLE


diff --git a/src/powder.c b/src/powder.c
index df88f9d..3f68c18 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -1604,8 +1604,9 @@ void update_particles_i(pixel *vid, int start, int inc)
 					pv[y/CELL+1][x/CELL] += ptypes[t].hotair*(3.5f-pv[y/CELL+1][x/CELL]);
 				if (x+CELL<XRES)
 				{
-					pv[y/CELL][x/CELL+1] += ptypes[t].hotair*(3.5f-pv[y/CELL][x/CELL+1]);
-					if (y+CELL<YRES)
+					if (pv[y/CELL][x/CELL+1]<3.5f)
+						pv[y/CELL][x/CELL+1] += ptypes[t].hotair*(3.5f-pv[y/CELL][x/CELL+1]);
+					if (y+CELL<YRES && pv[y/CELL+1][x/CELL+1]<3.5f)
 						pv[y/CELL+1][x/CELL+1] += ptypes[t].hotair*(3.5f-pv[y/CELL+1][x/CELL+1]);
 				}
 			}
--
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