public IcosphereBuilder(IcosphereBuilder source)
{
_vertices.AddRange(source._vertices);
var midPoints = new MidpointTable(_vertices);
foreach (var t in source._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);
_triangles.Add((t.i1, m1, m3));
_triangles.Add((m1, t.i2, m2));
_triangles.Add((m3, m2, t.i3));
_triangles.Add((m1, m2, m3));
}
}
public void Generate(Mesh mesh)
{
var builder = new IcosphereBuilder();
for (var i = 1; i < Subdivision; i++)
{
builder = new IcosphereBuilder(builder);
}
var vtx = builder.Vertices.Select(v => (Vector3)(v * Radius));
var nrm = builder.Vertices.Select(v => (Vector3)v);
var idx = builder.Indices;
if (builder.VertexCount > 65535)
{
mesh.indexFormat = IndexFormat.UInt32;
}
mesh.SetVertices(vtx.ToList());
mesh.SetNormals(nrm.ToList());
mesh.SetIndices(idx.ToList(), MeshTopology.Triangles, 0);
}