Finding Icosahedron Vertices

  • Thread starter BJRowlett
  • Start date
  • #1
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Ive posted this on gamedev.net, and figured Id post here aswell.

What Im trying to figure out, is how to get the coordinates (X, Y, Z) of the faces of an Icosahedron, without having to manually enter all the data.

This wouldnt be as hard, but the data structure for the information is as follows:
GeodesicSphere::Faces::Vertex::Coordinates

An example of this is:
(GeoSphere.FaceIndex[0].A.X, GeoSphere.FaceIndex[0].A.Y, GeoSphere.FaceIndex[0].A.Z)
(GeoSphere.FaceIndex[0].B.X, GeoSphere.FaceIndex[0].B.Y, GeoSphere.FaceIndex[0].B.Z)
(GeoSphere.FaceIndex[0].C.X, GeoSphere.FaceIndex[0].C.Y, GeoSphere.FaceIndex[0].C.Z)
Which holds the X,Y,Z values of the all the vertices on the first Face.

With this, I will have to assign the values to multiple indices coordinates, because adjacent faces share vertices. And I havent found an easy way to do so.

Also, finding a efficient way of sorting the faces, my idea was to select one node to be a 'north pole' and select any face, then work around the icosahedron, moving down a level, and repeating. This way, I can always use two of the vertices from the previous face, and just calculate the new one.

If you have any ideas that would work better, it would be greatly appreciated.


~BJRowlett
 

Answers and Replies

  • #2
270
62
I do recall the latitude of the non-pole nodes are arctan( 1/2 )
 
  • #3
DrGreg
Science Advisor
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