Commit 145cfcb7 authored by iSergio's avatar iSergio
Browse files

Added ElevationBand material, which maps colors and gradients to exact elevations.

parent 38c7c43d

cesiumjs4gwt-main/src/main/java/org/cesiumjs/cs/Cesium.java

+41 −4
Original line number Diff line number Diff line
@@ -17,15 +17,14 @@ 
package org.cesiumjs.cs;



import org.cesiumjs.cs.collections.EntityCollection;

import org.cesiumjs.cs.core.Cartographic;

import org.cesiumjs.cs.core.Ellipsoid;

import org.cesiumjs.cs.core.JulianDate;

import org.cesiumjs.cs.core.TimeInterval;

import org.cesiumjs.cs.core.*;

import org.cesiumjs.cs.core.providers.CesiumTerrainProvider;

import org.cesiumjs.cs.core.providers.TerrainProvider;

import org.cesiumjs.cs.datasources.graphics.ModelGraphics;

import org.cesiumjs.cs.js.JsObject;

import org.cesiumjs.cs.promise.Promise;

import org.cesiumjs.cs.scene.Material;

import org.cesiumjs.cs.scene.Scene;

import org.cesiumjs.cs.widgets.Command;



import jsinterop.annotations.JsConstructor;
@@ -271,6 +270,16 @@ public class Cesium { 
  @JsMethod(namespace = "Cesium", name = "exportKml")

  public static native Promise<JsObject, Void> exportKml(ExportKmlOptions options);



  /**

   * Creates a Material that combines multiple layers of color/gradient bands and maps them to terrain heights.

   * The shader does a binary search over all the heights to find out which colors are above and below a given height,

   * and interpolates between them for the final color. This material supports hundreds of entries relatively cheaply.

   * @param options {@link ElevationBandMaterialOptions} with the following properties

   * @return A new Material instance.

   */

  @JsMethod(namespace = "Cesium", name = "createElevationBandMaterial")

  public static native Material createElevationBandMaterial(ElevationBandMaterialOptions options);



  @JsFunction

  public interface Function {

    Object function(Object... args);
@@ -423,4 +432,32 @@ public class Cesium { 
      String Callback(ModelGraphics model, org.cesiumjs.cs.core.JulianDate time, JsObject externalFiles);

    }

  }



  /**

   * Options for {@link Cesium#createElevationBandMaterial(ElevationBandMaterialOptions)}.

   */

  @JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")

  public static class ElevationBandMaterialOptions {

    /**

     * The scene where the visualization is taking place.

     */

    @JsProperty

    public Scene scene;

    /**

     * A list of bands ordered from lowest to highest precedence.

     */

    @JsProperty

    public ElevationBandMaterialBand[] layers;



    @JsConstructor

    protected ElevationBandMaterialOptions() {}



    @JsOverlay

    public static ElevationBandMaterialOptions create(Scene scene, ElevationBandMaterialBand[] layers) {

      ElevationBandMaterialOptions options = new ElevationBandMaterialOptions();

      options.scene = scene;

      options.layers = layers;

      return options;

    }

  }

}

cesiumjs4gwt-main/src/main/java/org/cesiumjs/cs/core/ElevationBandMaterialBand.java

0 → 100644
+35 −0
Original line number Diff line number Diff line 
package org.cesiumjs.cs.core;



import jsinterop.annotations.*;



@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")

public class ElevationBandMaterialBand {

    /**

     * A list of elevation entries. They will automatically be sorted from lowest to highest.

     * If there is only one entry and extendsDownards and extendUpwards are both false, they will both be set to true.

     */

    @JsProperty

    public ElevationBandMaterialEntry[] entries;

    /**

     * If true, the band's minimum elevation color will extend infinitely downwards.

     * Default: false

     */

    @JsProperty

    public boolean extendDownwards;

    /**

     * If true, the band's maximum elevation color will extend infinitely upwards.

     * Default: false

     */

    @JsProperty

    public boolean extendUpwards;



    @JsConstructor

    protected ElevationBandMaterialBand() {}



    @JsOverlay

    public static ElevationBandMaterialBand create(ElevationBandMaterialEntry[] entries) {

        ElevationBandMaterialBand band = new ElevationBandMaterialBand();

        band.entries = entries;

        return band;

    }

}

cesiumjs4gwt-main/src/main/java/org/cesiumjs/cs/core/ElevationBandMaterialEntry.java

0 → 100644
+28 −0
Original line number Diff line number Diff line 
package org.cesiumjs.cs.core;



import jsinterop.annotations.*;



@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Object")

public class ElevationBandMaterialEntry {

    /**

     * The height.

     */

    @JsProperty

    public Number height;

    /**

     * The color at this height.

     */

    @JsProperty

    public Color color;



    @JsConstructor

    private ElevationBandMaterialEntry() {}



    @JsOverlay

    public static ElevationBandMaterialEntry create(Number height, Color color) {

        ElevationBandMaterialEntry entry = new ElevationBandMaterialEntry();

        entry.height = height;

        entry.color = color;

        return entry;

    }

}

cesiumjs4gwt-showcase/src/main/java/org/cleanlogic/cesiumjs4gwt/showcase/config/InjectorModule.java

+3 −75
Original line number Diff line number Diff line
@@ -25,80 +25,7 @@ import com.google.gwt.user.client.ui.Image; 


import org.cleanlogic.cesiumjs4gwt.showcase.config.provider.ShowcaseBrandsProvider;

import org.cleanlogic.cesiumjs4gwt.showcase.config.provider.ShowcaseLogoProvider;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.AmbientOcclusion;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ArcGISTiledElevationTerrain;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Billboards;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Bloom;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CZML;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CZMLModelArticulations;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CallbackProperty;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Camera;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CameraTutorial;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Cardboard;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CartographicLimitRectangle;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CesiumInspector;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CesiumNavigation;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Clampto3DModel;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Clampto3DTiles;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ClamptoTerrain;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Clustering;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CustomBaseLayerPicker;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CustomGeocoder;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CustomHomeButton;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CustomPerFeaturePostProcess;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.CustomPostProcess;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.DepthOfField;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Drawing;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.DrawingOnTerrain;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ExportKML;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GeoJSONAndTopoJSON;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GeoJSONsimplestyle;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GeometryAndAppearances;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GeometryHeightReference;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GoogleEarthEnterprise;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GroundAtmosphere;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.GroundPolylinePrimitive;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.HeadingPitchRoll;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.HelloWorld;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageBasedLighting;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryAdjustment;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryColorToAlpha;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryCutout;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryLayers;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryLayersManipulation;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ImageryLayersSplit;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Interpolation;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.KML;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Labels;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.LensFlare;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.LoadImages;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Materials;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Models3D;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Models3DColoring;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.MultipleSyncedViews;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ParticleSystem;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.ParticleSystemFireworks;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.PerFeaturePostProcessing;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Picking;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.PolylineArrow;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.PolylineDash;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.PolylinesOn3DTiles;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.PostProcessing;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.SampleHeightFrom3DTiles;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Shadows;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.SkyAtmosphere;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.SpheresAndEllipsoids;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Terrain;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.TerrainClippingPlanes;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DBIM;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DClippingPlanes;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DFeaturePicking;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DInspector;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DInterior;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DPhotogrammetry;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.Tiles3DPointCloud;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.TimeDynamicPointCloud;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.TimeDynamicWheels;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.*;

import org.cleanlogic.cesiumjs4gwt.showcase.puregwt.ShowcaseEventBus;

import org.cleanlogic.cesiumjs4gwt.showcase.puregwt.ShowcaseEventBusImpl;
@@ -187,9 +114,10 @@ public class InjectorModule extends AbstractGinModule { 
    bind(PolylinesOn3DTiles.class).asEagerSingleton();

    bind(TimeDynamicWheels.class).asEagerSingleton();

    bind(ImageryColorToAlpha.class).asEagerSingleton();



    bind(ExportKML.class).asEagerSingleton();

    bind(ArcGISTiledElevationTerrain.class).asEagerSingleton();

    bind(CZMLModelArticulations.class).asEagerSingleton();



    bind(ElevationBandMaterial.class).asEagerSingleton();

  }

}

cesiumjs4gwt-showcase/src/main/java/org/cleanlogic/cesiumjs4gwt/showcase/examples/ElevationBandMaterial.java

0 → 100644
+274 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2021 iserge.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package org.cleanlogic.cesiumjs4gwt.showcase.examples;



import com.google.gwt.core.client.GWT;

import com.google.gwt.user.client.ui.AbsolutePanel;

import com.google.gwt.user.client.ui.CheckBox;

import com.google.gwt.user.client.ui.FlexTable;

import com.google.gwt.user.client.ui.HTML;

import org.cesiumjs.cs.Cesium;

import org.cesiumjs.cs.core.*;

import org.cesiumjs.cs.core.HeadingPitchRoll;

import org.cesiumjs.cs.core.Math;

import org.cesiumjs.cs.scene.options.ViewOptions;

import org.cesiumjs.cs.widgets.ViewerPanel;

import org.cleanlogic.cesiumjs4gwt.showcase.basic.AbstractExample;

import org.cleanlogic.cesiumjs4gwt.showcase.components.store.ShowcaseExampleStore;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.slider.Slider;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.slider.SliderEvent;

import org.cleanlogic.cesiumjs4gwt.showcase.examples.slider.SliderListener;



import javax.inject.Inject;

import java.util.ArrayList;

import java.util.List;



public class ElevationBandMaterial extends AbstractExample {

    private boolean gradient = false;

    private double band1Position = 7000.0;

    private double band2Position = 7500.0;

    private double band3Position = 8000.0;

    private double bandThickness = 100.0;

    private double bandTransparency = 0.5;

    private double backgroundTransparency = 0.75;



    private ViewerPanel csVPanel;



    private Slider backgroundTransparencySlider;

    private Slider bandTransparencySlider;

    private Slider bandThicknessSlider;

    private Slider band1PositionSlider;

    private Slider band2PositionSlider;

    private Slider band3PositionSlider;

    private CheckBox gradientCBox;



    @Inject

    public ElevationBandMaterial(ShowcaseExampleStore store) {

        super("Elevation Band Material",

                "Apply elevation band material to the globe",

                new String[] { "Showcase", "Cesium", "3d", "Viewer", "Elevation", "Band", "Material" }, store);

    }



    @Override

    public void buildPanel() {

        csVPanel = new ViewerPanel();



        csVPanel.getViewer().terrainProvider = Cesium.createWorldTerrain(Cesium.CreateWorldTerrainOptions.create(true));



        ViewOptions cameraViewOptions = new ViewOptions();

        cameraViewOptions.destinationPos = new Cartesian3(290637.5534733206, 5637471.593707632, 2978256.8126927214);

        cameraViewOptions.orientation = new HeadingPitchRoll(4.747266966349747, -0.2206998858596192, 6.280340554587955);

        csVPanel.getViewer().camera.setView(cameraViewOptions);



        backgroundTransparencySlider = new Slider("backgroundTransparency", 1, 100, 75);

        backgroundTransparencySlider.setStep(1);

        backgroundTransparencySlider.setWidth("150px");

        backgroundTransparencySlider.addListener(new MSliderListener());



        bandTransparencySlider = new Slider("bandTransparency", 1, 100, 50);

        bandTransparencySlider.setStep(1);

        bandTransparencySlider.setWidth("150px");

        bandTransparencySlider.addListener(new MSliderListener());



        bandThicknessSlider = new Slider("bandThickness", 10, 1000, 100);

        bandThicknessSlider.setStep(1);

        bandThicknessSlider.setWidth("150px");

        bandThicknessSlider.addListener(new MSliderListener());



        band1PositionSlider = new Slider("band1Position", 4000, 8848, 7000);

        band1PositionSlider.setStep(1);

        band1PositionSlider.setWidth("150px");

        band1PositionSlider.addListener(new MSliderListener());



        band2PositionSlider = new Slider("band2Position", 4000, 8848, 7500);

        band2PositionSlider.setStep(1);

        band2PositionSlider.setWidth("150px");

        band2PositionSlider.addListener(new MSliderListener());



        band3PositionSlider = new Slider("band3Position", 4000, 8848, 8000);

        band3PositionSlider.setStep(1);

        band3PositionSlider.setWidth("150px");

        band3PositionSlider.addListener(new MSliderListener());



        gradientCBox = new CheckBox();

        gradientCBox.setValue(false);

        gradientCBox.addValueChangeHandler(event -> {

            gradient = event.getValue();

            updateMaterial();

        });



        FlexTable flexTable = new FlexTable();

        flexTable.setHTML(1, 0, "<font color=\"white\">Background Transparency</font>");

        flexTable.setWidget(1, 1, backgroundTransparencySlider);

        flexTable.setHTML(2, 0, "<font color=\"white\">Band Transparency</font>");

        flexTable.setWidget(2, 1, bandTransparencySlider);

        flexTable.setHTML(3, 0, "<font color=\"white\">Band Thickness</font>");

        flexTable.setWidget(3, 1, bandThicknessSlider);

        flexTable.setHTML(4, 0, "<font color=\"white\">Band 1 Position</font>");

        flexTable.setWidget(4, 1, band1PositionSlider);

        flexTable.setHTML(5, 0, "<font color=\"white\">Band 2 Position</font>");

        flexTable.setWidget(5, 1, band2PositionSlider);

        flexTable.setHTML(6, 0, "<font color=\"white\">Band 3 Position</font>");

        flexTable.setWidget(6, 1, band3PositionSlider);

        flexTable.setHTML(7, 0, "<font color=\"white\">Gradient</font>");

        flexTable.setWidget(7, 1, gradientCBox);



        AbsolutePanel absPanel = new AbsolutePanel();

        absPanel.add(csVPanel);

        absPanel.add(flexTable, 20, 20);



        contentPanel.add(new HTML(

                "<p>Apply elevation band material to the globe.</p>"));

        contentPanel.add(absPanel);



        initWidget(contentPanel);



        updateMaterial();

    }



    @Override

    public String[] getSourceCodeURLs() {

        String[] sourceCodeURLs = new String[1];

        sourceCodeURLs[0] = GWT.getModuleBaseURL() + "examples/" + "ElevationBandMaterial.txt";

        return sourceCodeURLs;

    }



    public void updateMaterial() {

        List<ElevationBandMaterialBand> layers = new ArrayList<>();



        ElevationBandMaterialBand band = ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                ElevationBandMaterialEntry.create(4200.0, new Color(0., 0., 0.2, backgroundTransparency)),

                ElevationBandMaterialEntry.create(8000.0, new Color(1., 1., 1., backgroundTransparency)),

                ElevationBandMaterialEntry.create(8500.0, new Color(1., 0., 0., backgroundTransparency))

        });

        band.extendDownwards = true;

        band.extendUpwards = true;



        layers.add(band);



        double gridStartHeight = 4200.0;

        double gridEndHeight = 8848.0;

        int gridCount = 50;

        for (int i = 0; i < gridCount; i++) {

            double lerper = i / (gridCount - 1.);

            double heightBelow = Math.lerp(gridStartHeight, gridEndHeight, lerper);

            double heightAbove = heightBelow + 10.0;

            double alpha = Math.lerp(0.2, 0.4, lerper) * backgroundTransparency;



            layers.add(ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                    ElevationBandMaterialEntry.create(heightBelow, new Color(1., 1., 1., alpha)),

                    ElevationBandMaterialEntry.create(heightAbove, new Color(1., 1., 1., alpha))

            }));

        }



        double antialias = java.lang.Math.min(10.0, bandThickness * 0.1);



        if (!gradient) {

            ElevationBandMaterialBand band1 = ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                    ElevationBandMaterialEntry.create(band1Position - bandThickness * 0.5 - antialias,

                            new Color(0., 0., 1., 0.0)),

                    ElevationBandMaterialEntry.create(band1Position - bandThickness * 0.5,

                            new Color(0., 0., 1., bandTransparency)),

                    ElevationBandMaterialEntry.create(band1Position + bandThickness * 0.5,

                            new Color(0., 0., 1., bandTransparency)),

                    ElevationBandMaterialEntry.create(band1Position + bandThickness * 0.5 + antialias,

                            new Color(0., 0., 1., 0.))

            });



            ElevationBandMaterialBand band2 = ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                    ElevationBandMaterialEntry.create(band2Position - bandThickness * 0.5 - antialias,

                            new Color(0., 1., 0., 0.0)),

                    ElevationBandMaterialEntry.create(band2Position - bandThickness * 0.5,

                            new Color(0., 1., 0., bandTransparency)),

                    ElevationBandMaterialEntry.create(band2Position + bandThickness * 0.5,

                            new Color(0., 1., 0., bandTransparency)),

                    ElevationBandMaterialEntry.create(band2Position + bandThickness * 0.5 + antialias,

                            new Color(0., 1., 0., 0.))

            });



            ElevationBandMaterialBand band3 = ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                    ElevationBandMaterialEntry.create(band3Position - bandThickness * 0.5 - antialias,

                            new Color(1., 0., 0., 0.0)),

                    ElevationBandMaterialEntry.create(band3Position - bandThickness * 0.5,

                            new Color(1., 0., 0., bandTransparency)),

                    ElevationBandMaterialEntry.create(band3Position + bandThickness * 0.5,

                            new Color(1., 0., 0., bandTransparency)),

                    ElevationBandMaterialEntry.create(band3Position + bandThickness * 0.5 + antialias,

                            new Color(1., 0., 0., 0.))

            });



            layers.add(band1);

            layers.add(band2);

            layers.add(band3);

        } else {

            ElevationBandMaterialBand combinedBand = ElevationBandMaterialBand.create(new ElevationBandMaterialEntry[]{

                    ElevationBandMaterialEntry.create(band1Position - bandThickness * 0.5,

                            new Color(0., 0., 1., bandTransparency)),

                    ElevationBandMaterialEntry.create(band2Position,

                            new Color(0., 1., 0., bandTransparency)),

                    ElevationBandMaterialEntry.create(band3Position + bandThickness * 0.5,

                            new Color(1., 0., 0., bandTransparency))

            });



            layers.add(combinedBand);

        }



        csVPanel.getViewer().scene().globe.material = Cesium.createElevationBandMaterial(Cesium.ElevationBandMaterialOptions.create(

                csVPanel.getViewer().scene(), layers.toArray(new ElevationBandMaterialBand[0])

        ));

    }



    private class MSliderListener implements SliderListener {



        @Override

        public void onStart(SliderEvent e) {



        }



        @Override

        public boolean onSlide(SliderEvent e) {

            Slider source = e.getSource();

            double value = source.getValue();

            if (source == backgroundTransparencySlider) {

                backgroundTransparency = value / 100.;

            } else if (source == bandTransparencySlider) {

                bandTransparency = value / 100.;

            } else if (source == bandThicknessSlider) {

                bandThickness = value;

            } else if (source == band1PositionSlider) {

                band1Position = value;

            } else if (source == band2PositionSlider) {

                band2Position = value;

            } else if (source == band3PositionSlider) {

                band3Position = value;

            }



            updateMaterial();



            return true;

        }



        @Override

        public void onChange(SliderEvent e) {



        }



        @Override

        public void onStop(SliderEvent e) {



        }

    }

}