Could have run off the end of the array by 1 because the queue counter points to the next available photon slot.

1 files changed, 1 insertions, 1 deletions

diff --git a/gpu.py b/gpu.py
index 372bc7b..4eb2fab 100644
--- a/gpu.py
+++ b/gpu.py
@@ -308,7 +308,7 @@ class GPU(object):
                 input_queue_gpu = output_queue_gpu
                 output_queue_gpu = temp
                 output_queue_gpu[:1].set(np.uint32(1))
-                nphotons = input_queue_gpu[:1].get()[0]
+                nphotons = input_queue_gpu[:1].get()[0] - 1
         
         if gpuarray.max(self.histories_gpu).get() & (1 << 31):
             print >>sys.stderr, "WARNING: ABORTED PHOTONS IN THIS EVENT"