diff -urN a/include/csgeom/poly3d.h b/include/csgeom/poly3d.h
--- a/include/csgeom/poly3d.h	2008-04-22 07:16:18.000000000 -0500
+++ b/include/csgeom/poly3d.h	2009-01-07 14:44:26.000000000 -0600
@@ -351,7 +351,7 @@
 struct csCompressVertex
 {
   size_t orig_idx;
-  int x, y, z;
+  float x, y, z;
   size_t new_idx;
   bool used;
 };
diff -urN a/libs/csgeom/poly3d.cpp b/libs/csgeom/poly3d.cpp
--- a/libs/csgeom/poly3d.cpp	2008-04-22 07:17:11.000000000 -0500
+++ b/libs/csgeom/poly3d.cpp	2009-01-07 14:45:00.000000000 -0600
@@ -884,9 +884,9 @@
   for (i = 0; i < num_vertices; i++)
   {
     vt[i].orig_idx = i;
-    vt[i].x = (int)ceil (vertices[i].x * 1000000);
-    vt[i].y = (int)ceil (vertices[i].y * 1000000);
-    vt[i].z = (int)ceil (vertices[i].z * 1000000);
+    vt[i].x = (float)ceil (vertices[i].x * 1000000.0);
+    vt[i].y = (float)ceil (vertices[i].y * 1000000.0);
+    vt[i].z = (float)ceil (vertices[i].z * 1000000.0);
   }
 
   // First sort so that all (nearly) equal vertices are together.