// Analytically subdivide a face to the required detail level.
void subdivide(Face3 face, int detail)
{
float cols = Mathf.Pow(2.0f, (float)detail);
//float cells = Mathf.Pow (4.0f, (float)detail);
THREEVector3 a = prepare(this.t_vertices [face.a]);
THREEVector3 b = prepare(this.t_vertices [face.b]);
THREEVector3 c = prepare(this.t_vertices [face.c]);
List <List <THREEVector3> > v = new List <List <THREEVector3> > ();
// Construct all of the vertices for this subdivision.
for (int i = 0; i <= cols; i++)
{
//v[ i ] = new List<THREEVector3>();
List <THREEVector3> vList = new List <THREEVector3> ();
v.Add(vList);
//v.Add (new List<THREEVector3>() );
THREEVector3 aj = prepare(a.clone().lerp(c, (float)i / cols));
THREEVector3 bj = prepare(b.clone().lerp(c, (float)i / cols));
int rows = (int)(cols - i);
for (int j = 0; j <= rows; j++)
{
THREEVector3 vv;
if (j == 0 && i == cols)
{
//v[ i ][ j ] = aj;
vv = aj;
}
else
{
//v[ i ][ j ] = prepare( aj.clone().lerp( bj, j / rows ) );
vv = prepare(aj.clone().lerp(bj, (float)j / rows));
}
vList.Add(vv);
}
}
// Construct all of the faces.
for (int i = 0; i < cols; i++)
{
for (int j = 0; j < 2 * (cols - i) - 1; j++)
{
int k = Mathf.FloorToInt((float)j / 2.0f);
if (j % 2 == 0)
{
make(
v [i] [k + 1],
v [i + 1] [k],
v [i] [k]
);
}
else
{
make(
v [i] [k + 1],
v [i + 1] [k + 1],
v [i + 1] [k]
);
}
}
}
}
