This example demonstrates how to use Contour API for a 3D Surface Mesh in SciChart for your Android applications. You may configure the contours by defining thickness, stroke color, opacity, offsets, intervals or even omit contours.

Please see details in SciChart Android 3D documentation article for Configuring Contours on Surface Meshes.

// Kotlin: SurfaceMeshContours3DChartFragment.kt

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SurfaceMeshContours3DChartFragment.kt is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************

package com.scichart.examples.fragments.examples3d.createSurfaceMeshChart.kt

import com.scichart.charting3d.visuals.SciChartSurface3D
import com.scichart.charting3d.visuals.renderableSeries.data.DrawMeshAs.SolidWithContours
import com.scichart.charting3d.visuals.renderableSeries.data.GradientColorPalette
import com.scichart.drawing.utility.ColorUtil.*
import com.scichart.examples.fragments.base.ExampleSingleChart3DBaseFragment
import com.scichart.examples.utils.scichartExtensions.*
import kotlin.math.max
import kotlin.math.sin
import kotlin.math.sqrt

class SurfaceMeshContours3DChartFragment : ExampleSingleChart3DBaseFragment() {
    override fun initExample(surface3d: SciChartSurface3D) {
        surface3d.suspendUpdates {
            xAxis = numericAxis3D()
            yAxis = numericAxis3D()
            zAxis = numericAxis3D()

            renderableSeries {
                surfaceMeshRenderableSeries3D {
                    uniformGridDataSeries3D<Double, Double, Double>(w, h) {
                        stepX = 0.01
                        stepZ = 0.01
                        for (x in 0 until w) {
                            for (z in 0 until h) {
                                val v = (1 + sin(x * 0.04 * ratio)) * 50 + (1 + sin(z * 0.1 * ratio)) * 50
                                val cx = w / 2.0
                                val cy = h / 2.0
                                val r = sqrt((x - cx) * (x - cx) + (z - cy) * (z - cy)) * ratio
                                val exp = max(0.0, 1 - r * 0.008)
                                val zValue = v * exp

                                updateYAt(x, z, zValue)
                            }
                        }
                    }
                    drawMeshAs = SolidWithContours
                    contourStrokeThickness = 2f
                    stroke = 0x77228B22
                    maximum = 150.0
                    strokeThickness = 1f
                    drawSkirt = true
                    meshColorPalette = GradientColorPalette(
                        intArrayOf(Aqua, Green, ForestGreen, DarkKhaki, BurlyWood, DarkSalmon, GreenYellow, DarkOrange, SaddleBrown, Brown, Brown),
                        floatArrayOf(0f, .1f, .2f, .3f, .4f, .5f, .6f, .7f, .8f, .9f, 1f)
                    )
                    opacity = 0.8f
                }
            }

            chartModifiers { defaultModifiers3D() }

            camera.position.assign(-1300f, 1300f, -1300f)
            worldDimensions.assign(600f, 300f, 300f)
        }
    }

    companion object {
        const val w = 64
        const val h = 64
        const val ratio = 200.0 / 64.0
    }
}

// Java: SurfaceMeshContours3DChartFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SurfaceMeshContours3DChartFragment.java is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************

package com.scichart.examples.fragments.examples3d.createSurfaceMeshChart;

import com.scichart.charting3d.model.dataSeries.grid.UniformGridDataSeries3D;
import com.scichart.charting3d.visuals.SciChartSurface3D;
import com.scichart.charting3d.visuals.renderableSeries.data.DrawMeshAs;
import com.scichart.charting3d.visuals.renderableSeries.data.GradientColorPalette;
import com.scichart.charting3d.visuals.renderableSeries.surfaceMesh.SurfaceMeshRenderableSeries3D;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.examples.fragments.base.ExampleSingleChart3DBaseFragment;

import static com.scichart.drawing.utility.ColorUtil.Aqua;
import static com.scichart.drawing.utility.ColorUtil.Brown;
import static com.scichart.drawing.utility.ColorUtil.BurlyWood;
import static com.scichart.drawing.utility.ColorUtil.DarkKhaki;
import static com.scichart.drawing.utility.ColorUtil.DarkOrange;
import static com.scichart.drawing.utility.ColorUtil.DarkSalmon;
import static com.scichart.drawing.utility.ColorUtil.ForestGreen;
import static com.scichart.drawing.utility.ColorUtil.Green;
import static com.scichart.drawing.utility.ColorUtil.GreenYellow;
import static com.scichart.drawing.utility.ColorUtil.SaddleBrown;

import androidx.annotation.NonNull;

public class SurfaceMeshContours3DChartFragment extends ExampleSingleChart3DBaseFragment {

    @Override
    protected void initExample(@NonNull SciChartSurface3D surface3d) {
        final int w = 64;
        final int h = 64;
        final double ratio =  200.0 / 64.0;

        final UniformGridDataSeries3D<Double, Double, Double> ds = new UniformGridDataSeries3D<>(Double.class, Double.class, Double.class, w, h);
        ds.setStepX(0.01);
        ds.setStepZ(0.01);

        for (int x = 0; x < w; x++) {
            for (int z = 0; z < h; z++) {
                final double v = (1 + Math.sin(x * 0.04 * ratio)) * 50 + (1 + Math.sin(z * 0.1 * ratio)) * 50;
                final double cx = w / 2d;
                final double cy = h / 2d;
                final double r = Math.sqrt((x - cx) * (x - cx) + (z - cy) * (z - cy)) * ratio;
                final double exp = Math.max(0, 1 - r * 0.008);
                final double zValue = v * exp;

                ds.updateYAt(x, z, zValue);
            }
        }

        final SurfaceMeshRenderableSeries3D rs = sciChart3DBuilder.newSurfaceMeshSeries3D()
                .withDataSeries(ds)
                .withDrawMeshAs(DrawMeshAs.SolidWithContours)
                .withContourStrokeThickness(2f)
                .withStroke(0x77228B22)
                .withMaximum(150)
                .withStrokeThicknes(1f)
                .withDrawSkirt(true)
                .withMeshColorPalette(new GradientColorPalette(
                        new int[]{Aqua, Green, ForestGreen, DarkKhaki, BurlyWood, DarkSalmon, GreenYellow, DarkOrange, SaddleBrown, Brown, Brown},
                        new float[]{0, .1f, .2f, .3f, .4f, .5f, .6f, .7f, .8f, .9f, 1})
                )
                .withOpacity(0.8f)
                .build();

        UpdateSuspender.using(surface3d, () -> {
            surface3d.setXAxis(sciChart3DBuilder.newNumericAxis3D().build());
            surface3d.setYAxis(sciChart3DBuilder.newNumericAxis3D().build());
            surface3d.setZAxis(sciChart3DBuilder.newNumericAxis3D().build());
            surface3d.getRenderableSeries().add(rs);
            surface3d.getChartModifiers().add(sciChart3DBuilder.newModifierGroupWithDefaultModifiers().build());

            surface3d.getCamera().getPosition().assign(-1300, 1300, -1300);
            surface3d.getWorldDimensions().assign(600, 300, 300);
        });
    }
}

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