Function tryCreateTetra

src/traces/isosurface/convert.js:479–590

(style, abcd, min, max)

    }

    function tryCreateTetra(style, abcd, min, max) {
        var result = false;

        var xyzv = getXYZV(abcd);

        var ok = [
            inRange(xyzv[0][3], min, max),
            inRange(xyzv[1][3], min, max),
            inRange(xyzv[2][3], min, max),
            inRange(xyzv[3][3], min, max)
        ];

        if(!ok[0] && !ok[1] && !ok[2] && !ok[3]) {
            return result;
        }

        if(ok[0] && ok[1] && ok[2] && ok[3]) {
            if(drawingSpaceframe) {
                result = drawTetra(style, xyzv, abcd) || result;
            }
            return result;
        }

        var interpolated = false;

        [
            [0, 1, 2, 3],
            [3, 0, 1, 2],
            [2, 3, 0, 1],
            [1, 2, 3, 0]
        ].forEach(function(e) {
            if(ok[e[0]] && ok[e[1]] && ok[e[2]] && !ok[e[3]]) {
                var A = xyzv[e[0]];
                var B = xyzv[e[1]];
                var C = xyzv[e[2]];
                var D = xyzv[e[3]];

                if(drawingSpaceframe) {
                    result = drawTri(style, [A, B, C], [abcd[e[0]], abcd[e[1]], abcd[e[2]]]) || result;
                } else {
                    var p1 = calcIntersection(D, A, min, max);
                    var p2 = calcIntersection(D, B, min, max);
                    var p3 = calcIntersection(D, C, min, max);

                    result = drawTri(null, [p1, p2, p3], [-1, -1, -1]) || result;
                }

                interpolated = true;
            }
        });
        if(interpolated) return result;

        [
            [0, 1, 2, 3],
            [1, 2, 3, 0],
            [2, 3, 0, 1],
            [3, 0, 1, 2],
            [0, 2, 3, 1],