2 files changed, 7 insertions, 0 deletions
diff --git a/src/simulation/Elements.h b/src/simulation/Elements.h
index 9e7e654..8acafde 100644
--- a/src/simulation/Elements.h
+++ b/src/simulation/Elements.h
@@ -46,6 +46,7 @@
 #define PROP_SPARKSETTLE	0x20000	//2^17 Allow Sparks/Embers to settle
 
 #define FLAG_STAGNANT	1
+#define FLAG_SKIPMOVE  0x2 // skip movement for one frame, only implemented for PHOT
 
 #define ST_NONE 0
 #define ST_SOLID 1
diff --git a/src/simulation/Simulation.cpp b/src/simulation/Simulation.cpp
index 9b23ae2..8396b93 100644
--- a/src/simulation/Simulation.cpp
+++ b/src/simulation/Simulation.cpp
@@ -2922,6 +2922,12 @@ killed:
 
 			if ((t==PT_PHOT||t==PT_NEUT||t==PT_ELEC)) {
 				if (t == PT_PHOT) {
+					if (parts[i].flags&FLAG_SKIPMOVE)
+					{
+						parts[i].flags &= ~FLAG_SKIPMOVE;
+						continue;
+					}
+
 					rt = pmap[fin_y][fin_x] & 0xFF;
 					lt = pmap[y][x] & 0xFF;