diff --git a/Source/smokeview/options.h b/Source/smokeview/options.h
index 877820810..37fa70303 100644
--- a/Source/smokeview/options.h
+++ b/Source/smokeview/options.h
@@ -21,6 +21,7 @@
 //#define pp_READ_KEYBOARD      // read keyboard in the command shell so the visualization can be paused 
 //#define pp_GETMESH_TEST
 //#define pp_COMPRESS         // new compression code
+//#define pp_GEOM_EXACT       // use exact coorindates for cases with more than 100 meshes
 
 //*** options: windows
 
diff --git a/Source/smokeview/readsmv.c b/Source/smokeview/readsmv.c
index 948d99d59..7d8491b24 100644
--- a/Source/smokeview/readsmv.c
+++ b/Source/smokeview/readsmv.c
@@ -2995,10 +2995,12 @@ int ReadSMV_Configure(){
   //*** hide_scene when moving objects if there are are lot of OBSTs or geometry triangles
   if(global_scase.ntotal_blockages > 250000 || GetNCGeomTriangles() > 250000)hide_scene = 1;
 
+#ifdef pp_GEOM_EXACT
   if(global_scase.meshescoll.nmeshes > 100){
     blocklocation   = BLOCKlocation_exact;
     glui_use_cfaces = 0;
   }
+#endif
 
   PRINT_TIMER(timer_readsmv, "update trianglesfaces");