/**
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* Determines if a time interval is empty.
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*
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* @name czm_isFull
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* @glslFunction
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*
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* @param {czm_raySegment} interval The interval to test.
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*
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* @returns {bool} <code>true</code> if the time interval is empty; otherwise, <code>false</code>.
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*
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* @example
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* bool b0 = czm_isEmpty(czm_emptyRaySegment); // true
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* bool b1 = czm_isEmpty(czm_raySegment(0.0, 1.0)); // false
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* bool b2 = czm_isEmpty(czm_raySegment(1.0, 1.0)); // false, contains 1.0.
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*/
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bool czm_isFull(czm_raySegment interval)
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{
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return (interval.start == 0.0 && interval.stop == czm_infinity);
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}
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