How can I get a point cloud from a patch object?

I've downloaded the IGESToolBox from here and brought in a flowpath from CAD. The IGESToolbox plots the supplied file as a patch;

patch('faces',TRI,'vertices',P','FaceColor',clr,'EdgeColor','none');

I would like to extract the point cloud from the patch so I can make a ndgrid or trimesh. However, I can't figure out how to get the data out of TRI and P. I've tried 3 different ways and I just end up with a funky wedge shape instead of the flowpath.

Thanks for looking

Answer 1

[Kelly Kearney]

I'm assuming from this example that TRI is nx3 and P is 3xm (i.e. your data is 3D)

trimesh uses the same face/vertex input as patch-with-face-vertex:

trimesh(TRI, P(1,:), P(2,:), P(3,:))

If you want the coordinates of all the triangular faces:

vx  = P(:,1);
vy  = P(:,2);
x = vx(TRI');
y = vy(TRI');

Answer 2

[Chris Virgin]

I didn't know that about trimesh (or I missed it in the documentation).

That's exactly what I needed.

Thanks for your help!