Procedural mesh creation - How?

Unity Engine
1

Hi people, I’m trying to script something that’s way over my capacities, therefor I need to procedurally generate a mesh. The only problem I have is that I really don’t get it how triangles are to be scripted, since the documentation seems a bit unclear about this.

When I got five vertices, let’s call them pt0 - pt4, then how am i supposed to draw a poly between pt0, pt1, pt2 and another one between pt2, pt3, pt4?
This is what I’ve tried so far:

var pt : Vector3[]; //This including the five points pt0-pt4.
function Update () {
  mesh.vertices = pt;
  mesh.triangles = [0, 1, 2];
  mesh.triangles = [2, 3, 4];
}

I don’t know why, but I’m not able to draw the polys where I want them. Sometimes, they seem to be drawn randomly or without a logical order. Can anyone tell me what’s wrong with this? Or how Triangles are to be created procedurally?

2

You have to assign the entire triangles array all at once. The length of the array has to be a multiple of 3, because what it describes, is a connect-the-dots between vertices. Every time you do mesh.triangles =, that’s a new mesh you’re dealing with. Not in the sense of a new instance of the Mesh class, but in terms of it being a new set of triangles that make up a surface.

mesh.triangles = [0,1,2, 2,3,4];
3

Thanks, Jessy, that should do it :slight_smile: