@Override
public void setQuadric(GeoQuadric3D quadric, Coords origin, Coords direction, double number) {
((GeoQuadric3DPart) quadric).set(origin, direction, number);
}
public void set(GeoElement geo) {
super.set(geo);
GeoQuadric3DPart quadric = (GeoQuadric3DPart) geo;
setLimits(quadric.min, quadric.max);
area = quadric.getArea();
}