add vcglib

vcglib/apps/meshes/quad.ply

@@ -0,0 +1,16 @@
+ply
+format ascii 1.0
+comment VCGLIB generated
+element vertex 4
+property float x
+property float y
+property float z
+element face 2
+property list uchar int vertex_indices
+end_header
+-1 -1 0 
+ 1 -1 0 
+ 1  1 0 
+-1  1 0 
+3 0 1 2 
+3 0 2 3