The value in a bitmask for {@link #intersectAab(float, float, float, float, float, float, int) intersectAab()} that identifies the plane with equation <code>y=1</code> when using the identity frustum.
See Implementation
The value in a bitmask for {@link #intersectAab(float, float, float, float, float, float, int) intersectAab()} that identifies the plane with equation <code>y=1</code> when using the identity frustum.