// Returns a midpoint with retrieving an existing vertex or adding a new one.
public int GetMidpoint(int i1, int i2)
{
var key = IndexPairToKey(i1, i2);
if (_table.ContainsKey(key))
{
return(_table[key]);
}
var mid = (_vc.vertices[i1] + _vc.vertices[i2]) * 0.5f;
var i = _vc.AddVertex(mid.normalized);
_table[key] = i;
return(i);
}
// Get the midpoint of the pair of indices.
public int GetMidpoint(int i1, int i2)
{
var key = IndexPairToKey(i1, i2);
// return from the table
if (table.ContainsKey(key))
{
return(table[key]);
}
// add a new entry to the table
var mid = (vertexCache.vertices[i1] + vertexCache.vertices[i2]) * 0.5f;
var i = vertexCache.AddVertex(mid.normalized);
table[key] = i;
return(i);
}
public IcosphereBuilder()
{
var t = (1 + Mathf.Sqrt(5)) / 2;
vertexCache = new VertexCache();
vertexCache.AddVertex(new Vector3(-1, +t, 0).normalized);
vertexCache.AddVertex(new Vector3(+1, +t, 0).normalized);
vertexCache.AddVertex(new Vector3(-1, -t, 0).normalized);
vertexCache.AddVertex(new Vector3(+1, -t, 0).normalized);
vertexCache.AddVertex(new Vector3(0, -1, +t).normalized);
vertexCache.AddVertex(new Vector3(0, +1, +t).normalized);
vertexCache.AddVertex(new Vector3(0, -1, -t).normalized);
vertexCache.AddVertex(new Vector3(0, +1, -t).normalized);
vertexCache.AddVertex(new Vector3(+t, 0, -1).normalized);
vertexCache.AddVertex(new Vector3(+t, 0, +1).normalized);
vertexCache.AddVertex(new Vector3(-t, 0, -1).normalized);
vertexCache.AddVertex(new Vector3(-t, 0, +1).normalized);
vertexCache.AddTriangle(0, 11, 5);
vertexCache.AddTriangle(0, 5, 1);
vertexCache.AddTriangle(0, 1, 7);
vertexCache.AddTriangle(0, 7, 10);
vertexCache.AddTriangle(0, 10, 11);
vertexCache.AddTriangle(1, 5, 9);
vertexCache.AddTriangle(5, 11, 4);
vertexCache.AddTriangle(11, 10, 2);
vertexCache.AddTriangle(10, 7, 6);
vertexCache.AddTriangle(7, 1, 8);
vertexCache.AddTriangle(3, 9, 4);
vertexCache.AddTriangle(3, 4, 2);
vertexCache.AddTriangle(3, 2, 6);
vertexCache.AddTriangle(3, 6, 8);
vertexCache.AddTriangle(3, 8, 9);
vertexCache.AddTriangle(4, 9, 5);
vertexCache.AddTriangle(2, 4, 11);
vertexCache.AddTriangle(6, 2, 10);
vertexCache.AddTriangle(8, 6, 7);
vertexCache.AddTriangle(9, 8, 1);
}
public IcosphereBuilder()
{
var t = (Mathf.Sqrt(5) + 1) / 2;
vertexCache = new VertexCache();
vertexCache.AddVertex(new Vector3(-1, +t, 0).normalized);
vertexCache.AddVertex(new Vector3(+1, +t, 0).normalized);
vertexCache.AddVertex(new Vector3(-1, -t, 0).normalized);
vertexCache.AddVertex(new Vector3(+1, -t, 0).normalized);
vertexCache.AddVertex(new Vector3(0, -1, +t).normalized);
vertexCache.AddVertex(new Vector3(0, +1, +t).normalized);
vertexCache.AddVertex(new Vector3(0, -1, -t).normalized);
vertexCache.AddVertex(new Vector3(0, +1, -t).normalized);
vertexCache.AddVertex(new Vector3(+t, 0, -1).normalized);
vertexCache.AddVertex(new Vector3(+t, 0, +1).normalized);
vertexCache.AddVertex(new Vector3(-t, 0, -1).normalized);
vertexCache.AddVertex(new Vector3(-t, 0, +1).normalized);
vertexCache.AddTriangle(0, 11, 5);
vertexCache.AddTriangle(0, 5, 1);
vertexCache.AddTriangle(0, 1, 7);
vertexCache.AddTriangle(0, 7, 10);
vertexCache.AddTriangle(0, 10, 11);
vertexCache.AddTriangle(1, 5, 9);
vertexCache.AddTriangle(5, 11, 4);
vertexCache.AddTriangle(11, 10, 2);
vertexCache.AddTriangle(10, 7, 6);
vertexCache.AddTriangle(7, 1, 8);
vertexCache.AddTriangle(3, 9, 4);
vertexCache.AddTriangle(3, 4, 2);
vertexCache.AddTriangle(3, 2, 6);
vertexCache.AddTriangle(3, 6, 8);
vertexCache.AddTriangle(3, 8, 9);
vertexCache.AddTriangle(4, 9, 5);
vertexCache.AddTriangle(2, 4, 11);
vertexCache.AddTriangle(6, 2, 10);
vertexCache.AddTriangle(8, 6, 7);
vertexCache.AddTriangle(9, 8, 1);
}
