SciChart3D now natively supports selection of data-points via the VertexSelectionModifier3D.

This is a ChartModifier3D derived type which can be added to the SciChart3DSurface via the SciChart3DSurface.ChartModifier property, or via a ModifierGroup3D

Tip! You can click on a data-point to select it, or, you can multi-select by holding down CTRL. Click elsewhere on the chart to deselect.

Documentation Links

– DataPointSelectionModifier

// SelectScatterPoint3DChart.xaml

<UserControl x:Class="SciChart.Examples.Examples.Charts3D.TooltipsAndHitTest3DCharts.SelectScatterPoint3DChart"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:s="http://schemas.abtsoftware.co.uk/scichart"
             xmlns:s3D="http://schemas.abtsoftware.co.uk/scichart3D"
             xmlns:system="clr-namespace:System;assembly=mscorlib"
             xmlns:tooltipsAndHitTest3DCharts="clr-namespace:SciChart.Examples.Examples.Charts3D.TooltipsAndHitTest3DCharts"
             xmlns:ext="http://schemas.abtsoftware.co.uk/scichart/exampleExternals"
             d:DesignHeight="400"
             d:DesignWidth="600"
             mc:Ignorable="d">

    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/SciChart.Examples.ExternalDependencies;component/Resources/Styles/MergedResources.xaml" />
            </ResourceDictionary.MergedDictionaries>

            <tooltipsAndHitTest3DCharts:ExamplePointCloudPaletteProvider x:Key="CloudPaletteProvider" />

        </ResourceDictionary>
    </UserControl.Resources>

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <ext:SciChart3DInteractionToolbar Grid.RowSpan="2" TargetSurface="{Binding Source={x:Reference Name=sciChartSurface}}"/>

        <s3D:SciChart3DSurface x:Name="sciChartSurface"
                               Grid.RowSpan="2"
                               Grid.Column="1"
                               Grid.ColumnSpan="2"
                               WorldDimensions="200,100,200"
                               s:ThemeManager.Theme="SciChartv4Dark">

            <s3D:SciChart3DSurface.RenderableSeries>
                <s3D:ScatterRenderableSeries3D x:Name="renderableSeries3D" PaletteProvider="{StaticResource CloudPaletteProvider}" >
                    <s3D:ScatterRenderableSeries3D.PointMarker>
                        <s3D:EllipsePointMarker3D Size="0.2"/>
                    </s3D:ScatterRenderableSeries3D.PointMarker>
                </s3D:ScatterRenderableSeries3D>
            </s3D:SciChart3DSurface.RenderableSeries>

            <s3D:SciChart3DSurface.XAxis>
                <s3D:NumericAxis3D x:Name="XAx" />
            </s3D:SciChart3DSurface.XAxis>

            <s3D:SciChart3DSurface.YAxis>
                <s3D:NumericAxis3D x:Name="YAx" />
            </s3D:SciChart3DSurface.YAxis>

            <s3D:SciChart3DSurface.ZAxis>
                <s3D:NumericAxis3D x:Name="ZAx" />
            </s3D:SciChart3DSurface.ZAxis>

            <s3D:SciChart3DSurface.ChartModifier>
                <s3D:ModifierGroup3D>
                    <s3D:FreeLookModifier3D ExecuteOn="MouseLeftButton" ExecuteWhen="Shift" />
                    <s3D:OrbitModifier3D ExecuteOn="MouseLeftButton" />
                    <s3D:VertexSelectionModifier3D ExecuteOn="MouseLeftButton" ExecuteWhen="None" />
                    <s3D:MouseWheelZoomModifier3D />
                </s3D:ModifierGroup3D>
            </s3D:SciChart3DSurface.ChartModifier>
        </s3D:SciChart3DSurface>
        
        <ListBox x:Name="slectedItem"
                 Grid.Row="1"
                 Grid.Column="2"
                 Width="200"
                 ScrollViewer.HorizontalScrollBarVisibility ="Hidden"
                 Height="300"
                 Margin="3"
                 Opacity="0.6">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <CheckBox Margin="0,0,5,0"
                                  Content="{x:Null}"
                                  IsChecked="{Binding PointMetadata3D.IsSelected,
                                                      Mode=TwoWay}" />
                        <TextBlock FontFamily="Bold" Text="X: " />
                        <TextBlock Text="{Binding X, StringFormat='0.00'}" />
                        <TextBlock FontFamily="Bold" Text=", Y: " />
                        <TextBlock Text="{Binding Y, StringFormat='0.00'}" />
                        <TextBlock FontFamily="Bold" Text=", Z: " />
                        <TextBlock Text="{Binding Z, StringFormat='0.00'}" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

        <!--  Some help text for example  -->
        <StackPanel Grid.Column="1"
                    Grid.ColumnSpan="2"
                    VerticalAlignment="Top"
                    HorizontalAlignment="Left"
                    Orientation="Vertical">

            <TextBlock FontSize="20" 
                       Opacity="0.7"
                       Background="#232323"
                       Margin="5"
                       HorizontalAlignment="Left"
                       Text="Press the left mouse button and drag the rectangle to select all point markers that fall inside!" 
                       Foreground="#FFF" />
            <TextBlock FontSize="20" 
                       Opacity="0.7"
                       Background="#232323"
                       Margin="5 0"
                       HorizontalAlignment="Left"
                       Text="Also it is possible to select a single point marker by clicking on it." 
                       Foreground="#FFF" />
            
            <StackPanel Margin="5" Orientation="Horizontal">

                <TextBlock FontSize="20" 
                           Opacity="0.7"
                           Background="#232323"
                           Text="To disable selection, uncheck" 
                           Foreground="#FFF" />

                <Image Width="32"
                       Height="32"
                       Margin="5 0"
                       Source="/SciChart.Examples;component/Resources/Images/select_icon.png"
                       Stretch="None" />

                <TextBlock FontSize="20" 
                           Opacity="0.7"
                           Background="#232323"
                           Text="More selection options can be found in the button's popup menu." 
                           Foreground="#FFF" />

            </StackPanel>

        </StackPanel>
    </Grid>
</UserControl>

// SelectScatterPoint3DChart.xaml.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2018. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// SelectScatterPoint3DChart.xaml.cs 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. 
// *************************************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting3D;
using SciChart.Charting3D.Model;
using SciChart.Charting3D.PointMarkers;
using SciChart.Core.Extensions;
using SciChart.Data.Model;
using SciChart.Examples.ExternalDependencies.Data;

namespace SciChart.Examples.Examples.Charts3D.TooltipsAndHitTest3DCharts
{
    /// <summary>
    /// Interaction logic for SelectScatterPoint3DChart.xaml
    /// </summary>
    public partial class SelectScatterPoint3DChart : UserControl
    {
        private XyzDataSeries3D<double> _xyzDataSeries3D;

        public SelectScatterPoint3DChart()
        {
            InitializeComponent();

            XAx.VisibleRange = new DoubleRange(0, 10);
            YAx.VisibleRange = new DoubleRange(-10, 10);
            ZAx.VisibleRange = new DoubleRange(1000, 10000);

            _xyzDataSeries3D = new XyzDataSeries3D<double>();
            
            _xyzDataSeries3D.DataSeriesChanged += OnScatterDataChanged;

            for (int i = 0; i < 300; i++)
            {
                double x = DataManager.Instance.GetGaussianRandomNumber(5, 1.5);
                double y = DataManager.Instance.GetGaussianRandomNumber(0.0, 5.0);
                double z = DataManager.Instance.GetGaussianRandomNumber(5500, 1500);

                PointMetadata3D vertex = new PointMetadata3D(Colors.Coral, 10);

                _xyzDataSeries3D.Append(x, y, z, vertex);
            }

            renderableSeries3D.DataSeries = _xyzDataSeries3D;
            sciChartSurface.ZoomExtents();
        }


        private void OnScatterDataChanged(object sender, DataSeriesChangedEventArgs e)
        {
            List<XyzDataPointViewModel<double>> selectedPoints = new List<XyzDataPointViewModel<double>>();
            for (int i = 0; i < _xyzDataSeries3D.Count; i++)
            {
                if (_xyzDataSeries3D.WValues[i] != null)
                {
                    if (_xyzDataSeries3D.WValues[i].IsSelected)
                    {
                        selectedPoints.Add(new XyzDataPointViewModel<double>(i,
                            _xyzDataSeries3D.XValues[i],
                            _xyzDataSeries3D.YValues[i],
                            _xyzDataSeries3D.ZValues[i],
                            _xyzDataSeries3D.WValues[i]));
                    }
                }
            }
            if (!selectedPoints.IsNullOrEmpty())
            {
                slectedItem.Visibility = Visibility.Visible;
                slectedItem.ItemsSource = selectedPoints;
            }
            else slectedItem.Visibility = Visibility.Collapsed;
        }
    }
}

// PaletteProvider.cs

// *************************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2018. All rights reserved.
//  
// Web: http://www.scichart.com
//   Support: support@scichart.com
//   Sales:   sales@scichart.com
// 
// PaletteProvider.cs 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. 
// *************************************************************************************
using System.Windows;
using System.Windows.Media;
using SciChart.Charting3D.Model;
using SciChart.Charting3D.RenderableSeries;

namespace SciChart.Examples.Examples.Charts3D.TooltipsAndHitTest3DCharts
{
    public class ExamplePointCloudPaletteProvider : IPointMarkerPaletteProvider3D
    {
        public Color? OverridePointMarker(IRenderableSeries3D series, int index, IPointMetadata3D metadata)
        {
            var pmFillColor = Colors.Lime;

            if (metadata != null && metadata.IsSelected)
            {
                pmFillColor = Colors.White;
            }

            return pmFillColor;
        }

        public void OnAttach(IRenderableSeries3D renderSeries)
        {
        }

        public void OnDetached()
        {
        }
    }
}

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