/**
 * DOC_TBA
 *
 * @name czm_raySegment
 * @glslStruct
 */
struct czm_raySegment
{
    float start;
    float stop;
};

/**
 * DOC_TBA
 *
 * @name czm_emptyRaySegment
 * @glslConstant 
 */
const czm_raySegment czm_emptyRaySegment = czm_raySegment(-czm_infinity, -czm_infinity);

/**
 * DOC_TBA
 *
 * @name czm_fullRaySegment
 * @glslConstant 
 */
const czm_raySegment czm_fullRaySegment = czm_raySegment(0.0, czm_infinity);