sync code with last improvements from OpenBSD

app/ico/objcube.h

@@ -0,0 +1,29 @@
+/* objcube.h - structure values for cube */
+
+{	"cube", "cube",	/* long and short names */
+	"octahedron",	/* long name of dual */
+	8, 12, 6,	/* number of vertices, edges, and faces */
+	{		/* vertices (x,y,z) */
+			/* all points must be within radius 1 of the origin */
+#define T 0.577
+		{  T,  T,  T },
+		{  T,  T, -T },
+		{  T, -T, -T },
+		{  T, -T,  T },
+		{ -T,  T,  T },
+		{ -T,  T, -T },
+		{ -T, -T, -T },
+		{ -T, -T,  T },
+#undef T
+	},
+	{	/* faces (numfaces + indexes into vertices) */
+		/*  faces must be specified clockwise from the outside */
+		4,	0, 1, 2, 3,
+		4, 	7, 6, 5, 4,
+		4, 	1, 0, 4, 5,
+		4,	3, 2, 6, 7,
+		4,	2, 1, 5, 6,
+		4,	0, 3, 7, 4,
+	}
+},		/* leave a comma to separate from the next include file */
+/* end */