public List<Fixture> testPointAll( Vector2 point )
{
AABB aabb;
var d = new Vector2( Settings.epsilon, Settings.epsilon );
aabb.lowerBound = point - d;
aabb.upperBound = point + d;
_point2 = point;
_testPointAllFixtures = new List<Fixture>();
// Query the world for overlapping shapes.
queryAABB( testPointAllCallback, ref aabb );
return _testPointAllFixtures;
}