// Return a new CSG solid representing space in either this solid or in the
// solid `csg`. Neither this solid nor the solid `csg` are modified.
public static csgjs_csgnode csg_union(csgjs_csgnode a1, csgjs_csgnode b1)
{
csgjs_csgnode a = a1.clone();
csgjs_csgnode b = b1.clone();
a.clipTo(b);
b.clipTo(a);
b.invert();
b.clipTo(a);
b.invert();
a.build(b.allPolygons());
csgjs_csgnode ret = new csgjs_csgnode(a.allPolygons());
a = null;
b = null;
return(ret);
}
// Remove all polygons in this BSP tree that are inside the other BSP tree
// `bsp`.
void clipTo(csgjs_csgnode other)
{
polygons = other.clipPolygons(polygons);
if (front != null)
{
front.clipTo(other);
}
if (back != null)
{
back.clipTo(other);
}
}
