Function visible

docs/app/js/sanddance-app.js:132931–132933

(lambda, phi)

        (0, _circleJs.circleStream)(stream, radius, delta1, direction, from, to);
    }
    function visible(lambda, phi) {
        return (0, _mathJs.cos)(lambda) * (0, _mathJs.cos)(phi) > cr;
    }
    // Takes a line and cuts into visible segments. Return values used for polygon
    // clipping: 0 - there were intersections or the line was empty; 1 - no
    // intersections 2 - there were intersections, and the first and last segments