Hi forum.

I am trying to solve a project. I might be a little bit burn from the week, but I can not exactly figure it out how to solve it.

I have the coordinates of two points on earth. I need to find the line that connects those two points on the planet. The line will be extended till it find itself again. Meaning I will get a section of the earth defined by an elipse that touches those two points. The challenge comes here:

I need to find which countries the line crosses. So far I think I know how to get the line that crosses two points on a sphere. So I am guessing this is not a â€śmodelâ€ť task, but a mapping one and finding the countries through a texture of the planet applied to the sphere in rhino.

What It could be easier is to have a 3d precise earth model in Rhino an avoid texturing. I found bunch of them made with polys, but I guess to find intersections and angles on Modo (in my case) will be a hassle.

If anybody has a tip or a idea of how to do this or where can i find a precise model of the earth in 3DM that might help.

Thanks a lot for your time.

Bruno