Return value of {@link #intersectAab(double, double, double, double, double, double) intersectAab()} and its different overloads identifying the plane with equation <code>y=1</code> when using the identity frustum.
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Return value of {@link #intersectAab(double, double, double, double, double, double) intersectAab()} and its different overloads identifying the plane with equation <code>y=1</code> when using the identity frustum.