GridHelper constructor

GridHelper([ dynamic size = 10, int divisions = 10, dynamic color1 = 0x444444, dynamic color2 = 0x888888, ])

Implementation

factory GridHelper(
    [size = 10, int divisions = 10, color1 = 0x444444, color2 = 0x888888]) {
  var color_1 = Color.fromHex(color1);
  var color_2 = Color.fromHex(color2);

  var center = divisions / 2;
  var step = size / divisions;
  var halfSize = size / 2;

  List<double> vertices = [];
  List<double> colors = List<double>.filled((divisions + 1) * 3 * 4, 0);

  for (var i = 0, j = 0, k = -halfSize; i <= divisions; i++, k += step) {
    vertices.addAll([-halfSize, 0, k, halfSize, 0, k]);
    vertices.addAll([k, 0, -halfSize, k, 0, halfSize]);

    var color = (i == center) ? color_1 : color_2;

    color.toArray(colors, j);
    j += 3;
    color.toArray(colors, j);
    j += 3;
    color.toArray(colors, j);
    j += 3;
    color.toArray(colors, j);
    j += 3;
  }

  var geometry = BufferGeometry();
  geometry.setAttribute(
      'position',
      Float32BufferAttribute(Float32Array.from(vertices), 3, false));
  geometry.setAttribute('color',
      Float32BufferAttribute(Float32Array.from(colors), 3, false));

  var material =
      LineBasicMaterial({"vertexColors": true, "toneMapped": false});

  return GridHelper.create(geometry, material);
}