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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta
      name="description"
      content="Use image-based lighting to light a model."
    />
    <meta name="cesium-sandcastle-labels" content="Showcases" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar">
      <table>
        <tbody>
          <tr>
            <td>Luminance at Zenith</td>
            <td>
              <input
                type="range"
                min="0.0"
                max="2.0"
                step="0.01"
                data-bind="value: luminanceAtZenith, valueUpdate: 'input'"
              />
              <input
                type="text"
                size="4"
                data-bind="value: luminanceAtZenith"
              />
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        var viewer = new Cesium.Viewer("cesiumContainer");

        if (!viewer.scene.specularEnvironmentMapsSupported) {
          window.alert(
            "This browser does not support specular environment maps."
          );
        }

        var environmentMapURL =
          "https://cesium.com/assets/kiara_6_afternoon_2k_ibl.ktx";
        var modelURL = "../../SampleData/models/Pawns/Pawns.glb";

        // This environment map was processed using Google's Filament project. To process your own:
        // 1 - Download the Filament release (https://github.com/google/filament/releases).
        // 2 - Run `cmgen --type=ktx --deploy=/path/to/output /path/to/image.hdr`. Other formats are also supported. Run `cmgen --help` for all options.
        // 3 - Take the generated coefficients and the KTX file and load them in CesiumJS as shown below.

        var L00 = new Cesium.Cartesian3(
          0.170455150831422,
          0.163151083190219,
          0.196966760289763
        );
        var L1_1 = new Cesium.Cartesian3(
          -0.066550267689383,
          -0.022088055746048,
          0.078835009246127
        );
        var L10 = new Cesium.Cartesian3(
          0.038364097478591,
          0.045714300098753,
          0.063498904606215
        );
        var L11 = new Cesium.Cartesian3(
          -0.01436536331281,
          -0.026490613715151,
          -0.05018940406602
        );
        var L2_2 = new Cesium.Cartesian3(
          -0.05153278691789,
          -0.050777795729986,
          -0.056449044453032
        );
        var L2_1 = new Cesium.Cartesian3(
          0.043454596136534,
          0.046672590104157,
          0.05753010764661
        );
        var L20 = new Cesium.Cartesian3(
          -0.00164046627411,
          0.001286638231156,
          0.007228908989616
        );
        var L21 = new Cesium.Cartesian3(
          -0.042260855700641,
          -0.046394335094707,
          -0.057562936365585
        );
        var L22 = new Cesium.Cartesian3(
          -0.004953478914091,
          -0.000479681664876,
          0.008508150106928
        );
        var coefficients = [L00, L1_1, L10, L11, L2_2, L2_1, L20, L21, L22];

        var height = 0.0;
        var hpr = new Cesium.HeadingPitchRoll(0.0, 0.0, 0.0);
        var origin = Cesium.Cartesian3.fromDegrees(
          -123.0744619,
          44.0503706,
          height
        );
        var modelMatrix = Cesium.Transforms.headingPitchRollToFixedFrame(
          origin,
          hpr
        );

        var model = viewer.scene.primitives.add(
          Cesium.Model.fromGltf({
            url: modelURL,
            modelMatrix: modelMatrix,
            minimumPixelSize: 128,
          })
        );

        model.readyPromise
          .then(function (model) {
            var camera = viewer.camera;

            // Zoom to model
            var controller = viewer.scene.screenSpaceCameraController;
            var r =
              2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);
            controller.minimumZoomDistance = r * 0.5;

            var center = Cesium.Matrix4.multiplyByPoint(
              model.modelMatrix,
              model.boundingSphere.center,
              new Cesium.Cartesian3()
            );
            var heading = Cesium.Math.toRadians(230.0);
            var pitch = Cesium.Math.toRadians(-20.0);
            camera.lookAt(
              center,
              new Cesium.HeadingPitchRange(heading, pitch, r * 2.0)
            );
            camera.lookAtTransform(Cesium.Matrix4.IDENTITY);

            model.sphericalHarmonicCoefficients = coefficients;
            model.specularEnvironmentMaps = environmentMapURL;

            // The viewModel tracks the state of our mini application.
            var viewModel = {
              luminanceAtZenith: model.luminanceAtZenith,
            };
            // Convert the viewModel members into knockout observables.
            Cesium.knockout.track(viewModel);

            // Bind the viewModel to the DOM elements of the UI that call for it.
            var toolbar = document.getElementById("toolbar");
            Cesium.knockout.applyBindings(viewModel, toolbar);

            function subscribeParameter(name) {
              Cesium.knockout
                .getObservable(viewModel, name)
                .subscribe(function (newValue) {
                  model[name] = newValue;
                });
            }

            subscribeParameter("luminanceAtZenith");

            Sandcastle.addToggleButton(
              "Use procedural environment lighting",
              false,
              function (checked) {
                if (!checked) {
                  model.sphericalHarmonicCoefficients = coefficients;
                  model.specularEnvironmentMaps = environmentMapURL;
                } else {
                  model.sphericalHarmonicCoefficients = undefined;
                  model.specularEnvironmentMaps = undefined;
                }
              }
            );
          })
          .otherwise(function (error) {
            window.alert(error);
          });
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>

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