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);
}
public void Subdivide()
{
var vc = new VertexCache();
vc.vertices.AddRange(vertexCache.vertices);
var midPoints = new MidpointTable(vc);
foreach (var t in vertexCache.triangles) {
var m1 = midPoints.GetMidpoint(t.i1, t.i2);
var m2 = midPoints.GetMidpoint(t.i2, t.i3);
var m3 = midPoints.GetMidpoint(t.i3, t.i1);
vc.AddTriangle(t.i1, m1, m3);
vc.AddTriangle(m1, t.i2, m2);
vc.AddTriangle(m3, m2, t.i3);
vc.AddTriangle(m1, m2, m3);
}
vertexCache = vc;
}
public void Subdivide()
{
var vc = new VertexCache();
vc.vertices.AddRange(vertexCache.vertices);
var midPoints = new MidpointTable(vc);
foreach (var t in vertexCache.triangles)
{
var m1 = midPoints.GetMidpoint(t.i1, t.i2);
var m2 = midPoints.GetMidpoint(t.i2, t.i3);
var m3 = midPoints.GetMidpoint(t.i3, t.i1);
vc.AddTriangle(t.i1, m1, m3);
vc.AddTriangle(m1, t.i2, m2);
vc.AddTriangle(m3, m2, t.i3);
vc.AddTriangle(m1, m2, m3);
}
vertexCache = vc;
}
// Constructor
public MidpointTable(VertexCache vc)
{
vertexCache = vc;
table = new Dictionary <int, int>();
}
public VertexCache(VertexCache source)
{
vertices = new List <Vector3>(source.vertices);
triangles = new List <IndexedTriangle>(source.triangles);
}
// Constructor.
public MidpointTable(VertexCache vc)
{
_vc = vc;
_table = new Dictionary<int, int>();
}
public VertexCache(VertexCache source)
{
vertices = new List<Vector3>(source.vertices);
triangles = new List<IndexedTriangle>(source.triangles);
}