/*!
* The number of triangle recursions in this chunk.
*
* @param a - Top
* @param b - Bottom Right
* @param c - Bottom Left
*/
private void SubdivideFace(int _top, int _bottomRight, int _bottomLeft, int n)
{
vertices.Add(SphereUtils.GetMidPointVertex(vertices[_top], vertices[_bottomRight]));
vertices.Add(SphereUtils.GetMidPointVertex(vertices[_bottomRight], vertices[_bottomLeft]));
vertices.Add(SphereUtils.GetMidPointVertex(vertices[_bottomLeft], vertices[_top]));
var middleRight = vertices.Count - 3;
var middleBottom = vertices.Count - 2;
var middleLeft = vertices.Count - 1;
// Only draw the last recursion
if (n == 1)
{
triangles.AddRange(new List <int> {
_top, middleRight, middleLeft
}); // Upper Top
triangles.AddRange(new List <int> {
middleLeft, middleBottom, _bottomLeft
}); // Lower Left
triangles.AddRange(new List <int> {
middleBottom, middleLeft, middleRight
}); // Lower Mid
triangles.AddRange(new List <int> {
middleRight, _bottomRight, middleBottom
}); // Lower Right
return;
}
SubdivideFace(_top, middleRight, middleLeft, n - 1);
SubdivideFace(middleLeft, middleBottom, _bottomLeft, n - 1);
SubdivideFace(middleBottom, middleLeft, middleRight, n - 1);
SubdivideFace(middleRight, _bottomRight, middleBottom, n - 1);
}
/*!
* The number of chunk recursions per base face.
*/
private void GenerateChunks(List <Vector3> _vertices, int n)
{
_vertices.Add(SphereUtils.GetMidPointVertex(_vertices[0], _vertices[1])); // Right Middle (3)
_vertices.Add(SphereUtils.GetMidPointVertex(_vertices[1], _vertices[2])); // Bottom Middle (4)
_vertices.Add(SphereUtils.GetMidPointVertex(_vertices[2], _vertices[0])); // Left middle (5)
// Only draw the last recursion
if (n == 1)
{
GenerateChunk(new List <Vector3> {
_vertices[0], _vertices[3], _vertices[5]
}); // Top
GenerateChunk(new List <Vector3> {
_vertices[5], _vertices[4], _vertices[2]
}); // Bottom Left
GenerateChunk(new List <Vector3> {
_vertices[4], _vertices[5], _vertices[3]
}); // Bottom Middle
GenerateChunk(new List <Vector3> {
_vertices[3], _vertices[1], _vertices[4]
}); // Bottom Right
return;
}
GenerateChunks(new List <Vector3> {
_vertices[0], _vertices[3], _vertices[5]
}, n - 1); // Top
GenerateChunks(new List <Vector3> {
_vertices[5], _vertices[4], _vertices[2]
}, n - 1); // Bottom Left
GenerateChunks(new List <Vector3> {
_vertices[4], _vertices[5], _vertices[3]
}, n - 1); // Bottom Middle
GenerateChunks(new List <Vector3> {
_vertices[3], _vertices[1], _vertices[4]
}, n - 1); // Bottom Right
}
