public bool Intersects(Sphere sphere)
{
// Find the point on this AABB closest to the sphere center.
// Vector3 pt = clostPtToAABB(this, sphere.pos);
Vector3 pt = ClosestPoint(sphere.pos);
// If that point is inside sphere, the AABB and sphere intersect.
//if (closestPointOnAABB)
// *closestPointOnAABB = pt;
var s = MathFunc.DistanceSq(pt, sphere.pos);
return(s <= sphere.r * sphere.r);
}