From 1264caa0dac8d0958c43829ad97509a44ddc701e Mon Sep 17 00:00:00 2001
From: Pascal Grittmann <grittmann@cg.uni-saarland.de>
Date: Thu, 8 Aug 2024 17:32:07 +0200
Subject: [PATCH] fix for many empty paths

---
 SeeSharp/Integrators/Common/PathCache.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/SeeSharp/Integrators/Common/PathCache.cs b/SeeSharp/Integrators/Common/PathCache.cs
index 9d98381..5f35842 100644
--- a/SeeSharp/Integrators/Common/PathCache.cs
+++ b/SeeSharp/Integrators/Common/PathCache.cs
@@ -32,7 +32,10 @@ public ref PathVertex GetVertex(int globalVertexIdx) {
             int offset = globalVertexIdx - (idx == 0 ? 0 : cumPathLen[idx - 1]);
             vertexMemoryIdx = pathIndices[idx] + offset;
         } else {
-            vertexMemoryIdx = pathIndices[idx + 1];
+            // Skip empty paths in-between
+            do idx++;
+            while (pathIndices[idx] == -1);
+            vertexMemoryIdx = pathIndices[idx];
         }
         return ref memory[vertexMemoryIdx];
     }