DrawingIn3D/HitTesting.xaml.cs

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using System;
using System.Collections.Generic;
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.Shapes;
using System.Windows.Media.Media3D;
using System.Windows.Media.Animation;

namespace DrawingIn3D
{
    /// <summary>
    /// Interaction logic for Materials.xaml
    /// </summary>

    public partial class HitTesting : System.Windows.Window
    {

        public HitTesting()
        {
            InitializeComponent();
        }

        private void ringVisual_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Point location = e.GetPosition(viewport);

            RayMeshGeometry3DHitTestResult meshHitResult = (RayMeshGeometry3DHitTestResult)VisualTreeHelper.HitTest(viewport, location);

            axisRotation.Axis = new Vector3D(
                     -meshHitResult.PointHit.Y, meshHitResult.PointHit.X, 0);

            DoubleAnimation animation = new DoubleAnimation();
            animation.To = 40;
            animation.DecelerationRatio = 1;
            animation.Duration = TimeSpan.FromSeconds(0.15);
            animation.AutoReverse = true;
            axisRotation.BeginAnimation(AxisAngleRotation3D.AngleProperty, animation);
        }
        
        // Alternative implementation using the Viewport.MouseDown event.
        private void viewport_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Point location = e.GetPosition(viewport);
            HitTestResult hitResult = VisualTreeHelper.HitTest(viewport, location);
            
            if (hitResult != null && hitResult.VisualHit == ringVisual)
            {
                // Hit the ring.
            }
            
            RayMeshGeometry3DHitTestResult meshHitResult = hitResult as RayMeshGeometry3DHitTestResult;
            if (meshHitResult != null && meshHitResult.ModelHit == ringModel)
            {
                // Hit the ring.