+(define (turn mesh . params)
+ (if (>= (length params) 3)
+ (apply mesh (cons 'turn params))
+ (mesh 'turn 0 0 (car params)))
+ mesh)
+
+(define (rotate mesh . params)
+ (if (>= (length params) 3)
+ (apply mesh (cons 'rotate params))
+ (mesh 'rotate 0 0 (car params)))
+ mesh)
+