finished the first awk example

code/awk/mkunion.awk

@@ -1,15 +1,18 @@
 #!/usr/bin/awk -f
 
+# create the sdl object: an union of sphere
 BEGIN	{
         print "#declare Bubules = object"
 	print "{ \nunion  { "
 	}
 
+# active portion of the code
 	{
 	printf("  sphere { <%f, %f, %f>, %f }\n", 	\
 			    $1, $2, $3, $4 )
 	}
 
+# closing sdl structure
 END	{
-
+	print "  }\n}\n"
 	}