static Quadric fromPlane(double a, double b, double c, double d) {
return Quadric(MutableMatrix44D(0, 0, 0, a/2,
0, 0, 0, b/2,
0, 0, 0, c/2,
a/2, b/2, c/2, d));
}
Sphere::Sphere(){
this->empty = false;
this->origin = Point(0.0f,0.0f,0.0f);
this->radius = 0.5f;
this->detalization = 25;
this->setQuadricAttributes(Quadric());
}
Sphere::Sphere(Point origin, GLfloat radius, GLint detalization){
this->empty = false;
this->origin = origin;
this->radius = radius;
this->detalization = detalization;
this->setQuadricAttributes(Quadric());
}
static Quadric fromEllipsoid(const Ellipsoid* ellipsoid) {
// assuming ellipsoid is centered on origin
const Vector3D R = ellipsoid->getOneOverRadiiSquared();
return Quadric(MutableMatrix44D(R._x, 0, 0, 0,
0, R._y, 0, 0,
0, 0, R._z, 0,
0, 0, 0, -1));
}
Quadric transformBy(const MutableMatrix44D& M) const {
MutableMatrix44D I = M.inversed();
MutableMatrix44D T = I.transposed();
return Quadric(T.multiply(Q).multiply(I));
}