Gaussian Curvature

[rob-rb]

Hi Nico,
I see that there is already an angles function in Trimesh. So basically there would be a fast method to calculate discrete gaussian curvature in the sense of 2*pi - Sum_over_angles_at_a_vertex. Could you give me some hint howto do that?

[nschloe]

You'll need to aggregate the angles for each point, numpy.add.at is your friend. npx's sum_at is even faster. (It uses bincount as a workhorse.)