--- a/pkg/octree/strtree.go	Sun Oct 13 22:15:55 2019 +0200
+++ b/pkg/octree/strtree.go	Mon Oct 14 01:28:18 2019 +0200
@@ -165,16 +165,12 @@
 		return err
 	}
 
-	if err := binary.Write(w, binary.LittleEndian, s.index[0]); err != nil {
-		return err
-	}
-
 	var buf [binary.MaxVarintLen32]byte
 
 	var last int32
 	var written int
 
-	for _, x := range s.index[1:] {
+	for _, x := range s.index {
 		delta := x - last
 		n := binary.PutVarint(buf[:], int64(delta))
 		for p := buf[:n]; len(p) > 0; p = p[n:] {
@@ -184,9 +180,9 @@
 			}
 			written += n
 		}
-
 		last = x
 	}
+
 	log.Printf("info: compressed index in bytes: %d %.2f (%d %.2f)\n",
 		written,
 		float64(written)/(1024*1024),