--- /dev/null
+# 1 -body material\r
+# 2 = 1 -ends filled\r
+#\r
+# 0--1\r
+# | | Y\r
+# 3--2\r
+#\r
+# X\r
+\r
+here\r
+p -0.5 0.5 0\r
+p 0.5 0.5 0\r
+p 0.5 -0.5 0\r
+p -0.5 -0.5 0\r
+\r
+p -0.5 0.5 1\r
+p 0.5 0.5 1\r
+p 0.5 -0.5 1\r
+p -0.5 -0.5 1\r
+\r
+mtl %1\r
+f 0 1 5 4\r
+f 1 2 6 5\r
+f 2 3 7 6\r
+f 3 0 4 7\r
+\r
+cmp 0 %2 1\r
+?0 f 0 1 2 3\r
+?0 f 4 5 6 7\r