diff --git a/xrspatial/gpu_rtx/mesh_utils.py b/xrspatial/gpu_rtx/mesh_utils.py
index 9e6286de..86bfbbb6 100644
--- a/xrspatial/gpu_rtx/mesh_utils.py
+++ b/xrspatial/gpu_rtx/mesh_utils.py
@@ -4,7 +4,7 @@
 
 
 def create_triangulation(raster, optix):
-    datahash = np.uint64(hash(str(raster.data.get())))
+    datahash = np.uint64(hash(str(raster.data.get())) % (1 << 64))
     optixhash = np.uint64(optix.getHash())
 
     # Calculate a scale factor for the height that maintains the ratio