The surface mesh charts are used to explore the relationships among three-dimensional data. SciChart API allows you to add contours to the mesh to represent the three-dimensional relationships in two dimensions in your iOS apps. The contours are configurable, you may set the thickness, stroke color, opacity, offsets, intervals or even omit contours.

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

// SurfaceMeshContours3DView.m

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SurfaceMeshContours3DView.m is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

#import "SurfaceMeshContours3DView.h"

@implementation SurfaceMeshContours3DView

- (Class)associatedType { return SCIChartSurface3D.class; }

- (void)initExample {
    const int w = 64;
    const int h = 64;
    const double ratio = 200.0 / 64.0;
    
    SCIUniformGridDataSeries3D *ds = [[SCIUniformGridDataSeries3D alloc] initWithXType:SCIDataType_Double yType:SCIDataType_Double zType:SCIDataType_Double xSize:w zSize:h];
    ds.stepX = @(0.01);
    ds.stepZ = @(0.01);
    
    for (int x = 0; x < w; x++) {
        for (int z = 0; z < h; z++) {
            double v = (1.0 + sin(x * 0.04 * ratio)) * 50 + (1.0 + sin(z * 0.1 * ratio)) * 50;
            double cx = w / 2.0;
            double cy = h / 2.0;
            double r = sqrt((x - cx) * (x - cx) + (z - cy) * (z - cy)) * ratio;
            double exp = MAX(0.0, 1.0 - r * 0.008);
            double zValue = v * exp;
            
            [ds updateYValue:@(zValue) atXIndex:x zIndex:z];
        }
    }
    
    unsigned int colors[11] = {0xFF00FFFF, 0xFF008000, 0xFF014421, 0xFFBDB76B, 0xFFDEB887, 0xFFE9967A, 0xFFADFF2F, 0xFFFF8C00, 0xFF8B4513, 0xFFA52A2A, 0xFFA52A2A };
    float stops[11] = { 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 };
    SCIGradientColorPalette *palette = [[SCIGradientColorPalette alloc] initWithColors:colors stops:stops count:11];
    
    SCISurfaceMeshRenderableSeries3D *rSeries = [SCISurfaceMeshRenderableSeries3D new];
    rSeries.dataSeries = ds;
    rSeries.drawMeshAs = SCIDrawMeshAs_SolidWithContours;
    rSeries.stroke = 0x77228B22;
    rSeries.maximum = 150;
    rSeries.strokeThickness = 2.0;
    rSeries.drawSkirt = YES;
    rSeries.cellHardnessFactor = 1.0;
    rSeries.meshColorPalette = palette;
    rSeries.opacity = 0.8;

    [SCIUpdateSuspender usingWithSuspendable:self.surface withBlock:^{
        self.surface.xAxis = [SCINumericAxis3D new];
        self.surface.yAxis = [SCINumericAxis3D new];
        self.surface.zAxis = [SCINumericAxis3D new];
        [self.surface.renderableSeries add:rSeries];
        [self.surface.chartModifiers add:[SCDExampleBaseViewController createDefaultModifiers3D]];

        self.surface.camera = [SCICamera3D new];
        [self.surface.camera.position assignX:-1300 y:1300 z:-1300];
        [self.surface.worldDimensions assignX:600 y:300 z:300];
    }];
}

@end

// SurfaceMeshContours3DView.swift

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2019. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SurfaceMeshContours3DView.swift is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

class SurfaceMeshContours3DView: SCDSingleChartViewController<SCIChartSurface3D> {
    
    override var associatedType: AnyClass { return SCIChartSurface3D.self }
    
    override func initExample() {
        let w = 64;
        let h = 64;
        let ratio = 200.0 / 64.0;
        
        let ds = SCIUniformGridDataSeries3D(xType: .double, yType: .double, zType: .double, xSize: w, zSize: h)
        ds.set(stepX: 0.01)
        ds.set(stepZ: 0.01)
        
        for x in 0 ..< w {
            for z in 0 ..< h {
                let v = (1.0 + sin(Double(x) * 0.04 * ratio)) * 50.0 + (1.0 + sin(Double(z) * 0.1 * ratio)) * 50.0
                let cx: Double = Double(w) / 2.0
                let cy: Double = Double(h) / 2.0
                let r: Double = sqrt((Double(x) - cx) * (Double(x) - cx) + (Double(z) - cy) * (Double(z) - cy)) * ratio
                let exp: Double = Double.maximum(0.0, 1.0 - r * 0.008)
                let yValue: Double = v * exp
                
                ds.update(y: yValue, atX: x, z: z)
            }
        }
        
        let palette = SCIGradientColorPalette(
            colors: [0xFF00FFFF, 0xFF008000, 0xFF014421, 0xFFBDB76B, 0xFFDEB887, 0xFFE9967A, 0xFFADFF2F, 0xFFFF8C00, 0xFF8B4513, 0xFFA52A2A, 0xFFA52A2A],
            stops: [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0]
        )
        
        let rSeries = SCISurfaceMeshRenderableSeries3D()
        rSeries.dataSeries = ds
        rSeries.drawMeshAs = .solidWithContours
        rSeries.contourStrokeThickness = 2.0
        rSeries.stroke = 0x77228B22
        rSeries.maximum = 150
        rSeries.strokeThickness = 2.0
        rSeries.drawSkirt = true
        rSeries.cellHardnessFactor = 1.0
        rSeries.meshColorPalette = palette
        rSeries.opacity = 0.8
        
        SCIUpdateSuspender.usingWith(surface) {
            self.surface.xAxis = SCINumericAxis3D()
            self.surface.yAxis = SCINumericAxis3D()
            self.surface.zAxis = SCINumericAxis3D()
            self.surface.renderableSeries.add(rSeries)
            self.surface.chartModifiers.add(SCDExampleBaseViewController.createDefaultModifiers3D())
            
            self.surface.camera.position.assignX(-1300, y: 1300, z: -1300)
            self.surface.worldDimensions.assignX(600, y: 300, z: 300)
        }
    }
}

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