The normal direction of the point of the mesh is better than the normal direction of the poly.

1. for the direction of the poly normal, I just found the above, and used the algorithm to mark the direction of the point. I thought about it for a few hours last night, not very good.

If you want to project any flattened poly object as a normal, I didn't think of it because the points on the surface of ploy are undefined.

2. mesh is easy to use. First

(1) Visibility of the normal.

(2) The visibility rate of each layer is very high.

(3) versatility of functions. The ray function of points is provided in the mesh, and the effect is very good.

Method for Finding the vertex coordinates of the mesh.

Meshop. getvert $6 -----

Poly:Polyop.Getfacenormal<Poly> <int face>Node: <Node = unsupplied>

Mesh: normal = getnormal OBJ 10 function provided by the system,
-- Get
Normal of vertex 10