From 9033786e4936ffcdf91011c1a02af4d48d253ebb Mon Sep 17 00:00:00 2001
From: Simon Robertshaw <simon@hardwired.org.uk>
Date: Tue, 12 Jun 2012 20:15:33 +0100
Subject: [PATCH] TPT: Fix PROP_NEUTPENETRATE, particles weren't being moved
into empty space
---
src/simulation/Simulation.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index acc667156..c4e6fbb83 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -2016,7 +2016,7 @@ int Simulation::try_move(int i, int x, int y, int nx, int ny)
if (parts[i].type==PT_NEUT) {
// target material is NEUTPENETRATE, meaning it gets moved around when neutron passes
unsigned s = pmap[y][x];
- if (!(elements[s&0xFF].Properties&PROP_NEUTPENETRATE))
+ if (s && !(elements[s&0xFF].Properties&PROP_NEUTPENETRATE))
return 1; // if the element currently underneath neutron isn't NEUTPENETRATE, don't move anything except the neutron
// if nothing is currently underneath neutron, only move target particle
if (s)