protected internal override void CollectInvolvedEntities(RawList<Entity> outputInvolvedEntities)
{
//The default implementation for solver groups looks at every single subconstraint.
//That's not necessary for these special constraints.
if (entityA != null)
outputInvolvedEntities.Add(entityA);
if (entityB != null)
outputInvolvedEntities.Add(entityB);
}