public bool CollideAgainstMove(Sphere sphere, float thisMass, float otherMass)
 {
     return(sphere.CollideAgainstMove(this, otherMass, thisMass));
 }
 public bool CollideAgainstBounce(Sphere sphere, float thisMass, float otherMass, float elasticity)
 {
     return(sphere.CollideAgainstBounce(this, otherMass, thisMass, elasticity));
 }
 public bool CollideAgainst(Sphere sphere)
 {
     return(sphere.CollideAgainst(this));
 }