examples/test/surface.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>MathBox - Surface</title>
  <script src="../../build/mathbox-bundle.js"></script>
  <link rel="stylesheet" href="../../build/mathbox.css">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1">
</head>
<body>
  <script>
    mathbox = mathBox({
      plugins: ['core', 'controls', 'cursor', 'stats'],
      controls: {
        klass: THREE.OrbitControls
      },
    });
    three = mathbox.three;

    three.camera.position.set(-3.5, 2.2, -3.3);
    three.renderer.setClearColor(new THREE.Color(0xFFFFFF), 1.0);

    view = mathbox.cartesian({
      range: [[-3, 3], [0, 1], [-3, 3]],
      scale: [2, 1, 2],
    });

    view.axis({
      axis: 1,
    });
    view.axis({
      axis: 3,
    });

    view.grid({
      width: 5,
      opacity: 0.5,
      axes: [1, 3],
    });

    var sampler = view.area({
      id: 'sampler',
      width: 64,
      height: 64,
      axes: [1, 3],
      expr: function (emit, x, y, i, j, time) {
        emit(x, .35 + .25 * (Math.sin(x + time) * Math.sin(y + time)), y);
        emit(x, .35 + .25 * (Math.sin(x * 1.31 + time * 1.13) * Math.sin(y * 1.46 - time * .94)) + .5, y);
        emit(x, .35 + .25 * (Math.sin(x * 1.25 + Math.sin(y + time) - time * 1.34) * Math.sin(y * 1.17 - time * .79)) + 1, y);
      },
      items: 3,
      channels: 3,
    });

    var color = view.matrix({
      expr: function (emit, i, j, time) {
        var r = .5 + Math.cos(time * .873) * j;
        var g = .5 + Math.sin(time) * i;
        var b = 1;
        var m = g * .75;
        var n = (r + g + b) / 3;

        r = Math.max(r, m, n*n);
        g = Math.max(g, m, n*n);
        b = Math.max(b, m, n*n);

        var rr = (r * r + r * Math.sin(time * .354)) / 2 * .9;
        var gg = b + (r + g) * .25 * Math.cos(time * .289)
        var bb = g + r * .5 + b * .5;

        rr = rr + (n - rr) * .75
        gg = gg + (n - gg) * .75
        bb = bb + (n - bb) * .75

        emit(.4, .7, 1, 1);
        emit(1, 1, 1, 1);
        emit(rr, gg, bb, 1);
      },
      width:  2,
      height: 2,
      items:  3,
      channels: 4,
    })
    .repeat({
      id: 'color',
    });

    view.surface({
      shaded: true,
      lineX: true,
      lineY: true,
      points: sampler,
      colors: color,
      color: 0xFFFFFF,
      width: 5,
    });

  </script>
</body>
</html>