json2.js in the third dimension

json3.js

// author: Kevin Kwok, based on Rose Curve by Eduard Bespalov
// license: The Software shall be used for Good, not Evil.

function main(params) {
    var radius = 20,
        vec = new CSG.Vector3D(0, 6, 0),
        angle;

    angle = 360 / 4;
    var pent = CSG.Polygon.createFromPoints([
            vec,
            vec.rotateZ(1 * angle),
            vec.rotateZ(2 * angle),
            vec.rotateZ(3 * angle)
        ])
        .rotateY(90)
        .setColor([0.5,0.5,0.5]);
    return pent.solidFromSlices({
        numslices: 500,
        loop: true,
        callback: function(t, slice) {
            var angle = t * Math.PI,
                r = radius * Math.sin(angle),
                x = r * Math.cos(angle),
                y = r * Math.sin(angle),
                vec = new CSG.Vector3D(x, y, 0);
                var x1 = radius * (Math.cos(angle) * Math.cos(angle) 
                    - Math.sin(angle) * Math.sin(angle)),
                    y1 = radius * (Math.cos(angle) * Math.sin(angle) 
                    + Math.cos(angle) * Math.sin(angle)),
                    turn = (new CSG.Vector2D(x1, y1)).angleDegrees();
            return this
                .rotateX(t * 180)
                .rotateZ(turn)
                .translate(vec);
        }
    });
}