diff --git a/mesh/cube.obj b/mesh/cube.obj
index 61185dc..f7ed751 100644
--- a/mesh/cube.obj
+++ b/mesh/cube.obj
@@ -1,11 +1,11 @@
-v -0.5 -0.5 0.5
-v 0.5 -0.5 0.5
-v -0.5 0.5 0.5
-v 0.5 0.5 0.5
-v -0.5 0.5 -0.5
-v 0.5 0.5 -0.5
-v -0.5 -0.5 -0.5
-v 0.5 -0.5 -0.5
+v -1 -1 1
+v 1 -1 1
+v -1 1 1
+v 1 1 1
+v -1 1 -1
+v 1 1 -1
+v -1 -1 -1
+v 1 -1 -1
 f 1 2 4
 f 1 4 3
 f 3 4 6
diff --git a/mesh/tet.obj b/mesh/tet.obj
new file mode 100644
index 0000000..e7a3772
--- /dev/null
+++ b/mesh/tet.obj
@@ -0,0 +1,8 @@
+v 0 0 0
+v 1 0 0
+v 0 1 0
+v 0 0 1
+f 1 2 3
+f 1 2 4
+f 1 3 4
+f 2 3 4