public String toString() {
if (Vector4f.dot(normal(), v1.asVector()) > 0) {
return "f " + b + " " + a + " " + c + " " + d;
} else {
return "f " + a + " " + b + " " + c + " " + d;
}
}
public static Vector2f transform(Matrix4f m, float x, float y) {
tmpV.set(x, y);
Matrix4f.transform(m, tmpV, tmpV);
return new Vector2f(tmpV.x, tmpV.y);
}
public Vector4f normal() {
return Project.cross4(
Vector4f.sub(v1.asVector(), v4.asVector(), null),
Vector4f.sub(v2.asVector(), v4.asVector(), null),
Vector4f.sub(v3.asVector(), v4.asVector(), null));
}