Originally Posted by

**jacqueslaflute** Hi!

I am implementing the computation of spherical harmonics for the simulation of non-radially oscillating stars.

Therefore, I need to define a grid of points regularly distributed on a sphere.

For defining the position of these points I want to use a icosahedron and subdivide its faces (iteratively) to create a finer grid.

This grid is then projected on a sphere having the same center as the icosahedron.

I have the following questions:

1) For the computation I need to define somehow, which points of the resulting surface grid (of the subdicided icosahedron) are adjacent since I will have to compute the projected surface area of each triangle.

Triangles may not be calculated twice (or more times). Is there a formalism for such a problem?

2) I will have to interpolate a grid of points P (on a sphere) onto another grid of points Q. Therefore, I need to find for every point of Q at least the 3 closest points of P to interpolate.

Is there a more efficient way than just computing for every single point of Q the distances to all points of P and select the 3 closest points for interpolation?

I hope my questions were formulated clear enough... I would also be happy about any helping reference to a website or literature.

Thanks in advance for your answers!

Cheers, Wolfgang.