private void Init()
{
triangles = new STriangle[2];
triangles[0] = new STriangle();
triangles[1] = new STriangle();
Update(position, right, up, forward, scale, materialID);
}
private void Init()
{
triangles = new STriangle[4];
float ho = (float)Math.Sqrt(3) / 2;
float ht = (float)Math.Sqrt(6) / 3;
Vector3 v1 = position - up * ht / 4 + forward * ho * 2 / 3;
Vector3 v2 = position - up * ht / 4 - forward * ho / 3 + right * 0.5f;
Vector3 v3 = position - up * ht / 4 - forward * ho / 3 - right * 0.5f;
Vector3 v4 = position + up * ht * 3 / 4;
triangles[0] = new STriangle(v1, v2, v3, materialID);
triangles[1] = new STriangle(v4, v2, v3, materialID);
triangles[2] = new STriangle(v1, v4, v3, materialID);
triangles[3] = new STriangle(v1, v2, v4, materialID);
}