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    copied!<p>This is going to be a bit long, so bear with me... </p> <p><strong>1st</strong>, you need to modify the 3DTools library so you can apply a transformation to the <code>TrackballDecorator</code> as follow: </p> <pre><code>using System; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Media.Media3D; using System.Windows.Input; namespace _3DTools { public class TrackballDecorator : Viewport3DDecorator { #region Private Members private Point m_PreviousPosition2D; private Vector3D m_PreviousPosition3D = new Vector3D(0, 0, 1); private Transform3DGroup m_Transform; private ScaleTransform3D m_Scale = new ScaleTransform3D(); private AxisAngleRotation3D m_Rotation = new AxisAngleRotation3D(); private TranslateTransform3D m_Translate = new TranslateTransform3D(); private readonly Border m_EventSource; #endregion #region Constructor public TrackballDecorator() { TranslateScale = 10; ZoomScale = 1; RotateScale = 1; // the transform that will be applied to the viewport 3d's camera m_Transform = new Transform3DGroup(); m_Transform.Children.Add(m_Scale); m_Transform.Children.Add(new RotateTransform3D(m_Rotation)); m_Transform.Children.Add(m_Translate); // used so that we always get events while activity occurs within // the viewport3D m_EventSource = new Border { Background = Brushes.Transparent }; PreViewportChildren.Add(m_EventSource); } #endregion #region Properties /// &lt;summary&gt; /// A transform to move the camera or scene to the trackball's /// current orientation and scale. /// &lt;/summary&gt; public Transform3DGroup Transform { get { return m_Transform; } set { m_Transform = value; m_Scale = m_Transform.GetScaleTransform3D(); m_Translate = m_Transform.GetTranslateTransform3D(); m_Rotation = m_Transform.GetRotateTransform3D().Rotation as AxisAngleRotation3D; ApplyTransform(); } } public double TranslateScale { get; set; } public double RotateScale { get; set; } public double ZoomScale { get; set; } #endregion #region Event Handling protected override void OnMouseDown(MouseButtonEventArgs e) { base.OnMouseDown(e); m_PreviousPosition2D = e.GetPosition(this); m_PreviousPosition3D = ProjectToTrackball(ActualWidth, ActualHeight, m_PreviousPosition2D); if (Mouse.Captured == null) { Mouse.Capture(this, CaptureMode.Element); } } protected override void OnMouseUp(MouseButtonEventArgs e) { base.OnMouseUp(e); if (IsMouseCaptured) { Mouse.Capture(this, CaptureMode.None); } } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (IsMouseCaptured) { Point currentPosition = e.GetPosition(this); // avoid any zero axis conditions if (currentPosition == m_PreviousPosition2D) return; // Prefer tracking to zooming if both buttons are pressed. if (e.LeftButton == MouseButtonState.Pressed) { Track(currentPosition); } else if (e.RightButton == MouseButtonState.Pressed) { Zoom(currentPosition); } else if (e.MiddleButton == MouseButtonState.Pressed) { Translate(currentPosition); } m_PreviousPosition2D = currentPosition; ApplyTransform(); } } private void ApplyTransform() { Viewport3D viewport3D = Viewport3D; if (viewport3D != null) { if (viewport3D.Camera != null) { if (viewport3D.Camera.IsFrozen) { viewport3D.Camera = viewport3D.Camera.Clone(); } if (viewport3D.Camera.Transform != m_Transform) { viewport3D.Camera.Transform = m_Transform; } } } } #endregion Event Handling private void Track(Point currentPosition) { var currentPosition3D = ProjectToTrackball(ActualWidth, ActualHeight, currentPosition); var axis = Vector3D.CrossProduct(m_PreviousPosition3D, currentPosition3D); var angle = Vector3D.AngleBetween(m_PreviousPosition3D, currentPosition3D); // quaterion will throw if this happens - sometimes we can get 3D positions that // are very similar, so we avoid the throw by doing this check and just ignoring // the event if (axis.Length == 0) return; var delta = new Quaternion(axis, -angle); // Get the current orientantion from the RotateTransform3D var r = m_Rotation; var q = new Quaternion(m_Rotation.Axis, m_Rotation.Angle); // Compose the delta with the previous orientation q *= delta; // Write the new orientation back to the Rotation3D m_Rotation.Axis = q.Axis; m_Rotation.Angle = q.Angle; m_PreviousPosition3D = currentPosition3D; } private static Vector3D ProjectToTrackball(double width, double height, Point point) { var x = point.X / (width / 2); // Scale so bounds map to [0,0] - [2,2] var y = point.Y / (height / 2); x = x - 1; // Translate 0,0 to the center y = 1 - y; // Flip so +Y is up instead of down var z2 = 1 - x * x - y * y; // z^2 = 1 - x^2 - y^2 var z = z2 &gt; 0 ? Math.Sqrt(z2) : 0; return new Vector3D(x, y, z); } private void Zoom(Point currentPosition) { var yDelta = currentPosition.Y - m_PreviousPosition2D.Y; var scale = Math.Exp(yDelta / 100) / ZoomScale; // e^(yDelta/100) is fairly arbitrary. m_Scale.ScaleX *= scale; m_Scale.ScaleY *= scale; m_Scale.ScaleZ *= scale; } private void Translate(Point currentPosition) { // Calculate the panning vector from screen(the vector component of the Quaternion // the division of the X and Y components scales the vector to the mouse movement var qV = new Quaternion(((m_PreviousPosition2D.X - currentPosition.X) / TranslateScale), ((currentPosition.Y - m_PreviousPosition2D.Y) / TranslateScale), 0, 0); // Get the current orientantion from the RotateTransform3D var q = new Quaternion(m_Rotation.Axis, m_Rotation.Angle); var qC = q; qC.Conjugate(); // Here we rotate our panning vector about the the rotaion axis of any current rotation transform // and then sum the new translation with any exisiting translation qV = q * qV * qC; m_Translate.OffsetX += qV.X; m_Translate.OffsetY += qV.Y; m_Translate.OffsetZ += qV.Z; } } } </code></pre> <p>The <code>GetXXXTransform3D</code> methods are extension methods defined as follow:</p> <pre><code>public static ScaleTransform3D GetScaleTransform3D(this Transform3DGroup transform3DGroup) { ScaleTransform3D scaleTransform3D = null; if (transform3DGroup != null) { foreach (var transform in transform3DGroup.Children) { scaleTransform3D = transform as ScaleTransform3D; if (scaleTransform3D != null) return scaleTransform3D; } } return scaleTransform3D; } public static RotateTransform3D GetRotateTransform3D(this Transform3DGroup transform3DGroup) { RotateTransform3D rotateTransform3D = null; if (transform3DGroup != null) { foreach (var transform in transform3DGroup.Children) { rotateTransform3D = transform as RotateTransform3D; if (rotateTransform3D != null) return rotateTransform3D; } } return rotateTransform3D; } public static TranslateTransform3D GetTranslateTransform3D(this Transform3DGroup transform3DGroup) { TranslateTransform3D translateTransform3D = null; if (transform3DGroup != null) { foreach (var transform in transform3DGroup.Children) { translateTransform3D = transform as TranslateTransform3D; if (translateTransform3D != null) return translateTransform3D; } } return translateTransform3D; } </code></pre> <p><strong>2nd</strong>, you need to declare a <code>Transform</code> to your <code>PerspectiveCamera</code> as follow:<br> (the example is taken from Sasha Barber's <a href="http://www.codeproject.com/KB/WPF/WPF3D_1.aspx?msg=2488254" rel="nofollow">Elements3D</a> project which I used to test this) </p> <pre><code>&lt;Tools:TrackballDecorator x:Name="tbViewPort"&gt; &lt;Viewport3D x:Name="vpFeeds"&gt; &lt;Viewport3D.Camera&gt; &lt;PerspectiveCamera x:Name="camera" Position="-2,2,40" LookDirection="2,-2,-40" FieldOfView="90"&gt; &lt;PerspectiveCamera.Transform&gt; &lt;Transform3DGroup /&gt; &lt;/PerspectiveCamera.Transform&gt; &lt;/PerspectiveCamera&gt; &lt;/Viewport3D.Camera&gt; &lt;ContainerUIElement3D x:Name="container" /&gt; &lt;ModelVisual3D x:Name="model"&gt; &lt;ModelVisual3D.Content&gt; &lt;DirectionalLight Color="White" Direction="-1,-1,-1" /&gt; &lt;/ModelVisual3D.Content&gt; &lt;/ModelVisual3D&gt; &lt;/Viewport3D&gt; &lt;/Tools:TrackballDecorator&gt; </code></pre> <p><strong>3rd</strong>, since we are going to store each part of the whole transformation in a separate value, you need to create the relevant properties in your settings file, i.e. <code>CameraScaleX</code>, <code>CameraScaleY</code>, <code>CameraScaleZ</code>, <code>CameraTranslateX</code>, <code>CameraTranslateY</code>, <code>CameraTranslateZ</code>, <code>CameraRotateAxisX</code>, <code>CameraRotateAxisY</code>, <code>CameraRotateAxisZ</code> and <code>CameraRotateAngle</code>. All are of type <code>double</code> and are stored in User scope.</p> <p><strong>4th</strong> and last step is to actually save and load these settings into the camera using the following code: </p> <pre><code>private void SaveCameraSettings() { var transform3DGroup = camera.Transform as Transform3DGroup; if (transform3DGroup != null) { foreach (var transform in transform3DGroup.Children) { var scale = transform as ScaleTransform3D; if (scale != null) SaveCameraSetting(scale); var rotate = transform as RotateTransform3D; if (rotate != null) SaveCameraSetting(rotate); var translate = transform as TranslateTransform3D; if (translate != null) SaveCameraSetting(translate); } Settings.Default.Save(); } } private static void SaveCameraSetting(ScaleTransform3D transform) { Properties.Settings.Default.CameraScaleX = transform.ScaleX; Properties.Settings.Default.CameraScaleY = transform.ScaleY; Properties.Settings.Default.CameraScaleZ = transform.ScaleZ; } private static void SaveCameraSetting(RotateTransform3D transform) { var axisAngleRotation3D = transform.Rotation as AxisAngleRotation3D; if (axisAngleRotation3D != null) { Properties.Settings.Default.CameraRotateAxisX = axisAngleRotation3D.Axis.X; Properties.Settings.Default.CameraRotateAxisY = axisAngleRotation3D.Axis.Y; Properties.Settings.Default.CameraRotateAxisZ = axisAngleRotation3D.Axis.Z; Properties.Settings.Default.CameraRotateAngle = axisAngleRotation3D.Angle; } } private static void SaveCameraSetting(TranslateTransform3D transform) { Properties.Settings.Default.CameraTranslateX = transform.OffsetX; Properties.Settings.Default.CameraTranslateY = transform.OffsetY; Properties.Settings.Default.CameraTranslateZ = transform.OffsetZ; } private void LoadCameraPosition() { var d = Settings.Default; var transform3DGroup = new Transform3DGroup(); var scaleTransform3D = new ScaleTransform3D(d.CameraScaleX, d.CameraScaleY, d.CameraScaleZ); var translateTransform3D = new TranslateTransform3D(d.CameraTranslateX, d.CameraTranslateY, d.CameraTranslateZ); var axisAngleRotation3D = new AxisAngleRotation3D(new Vector3D(d.CameraRotateAxisX, d.CameraRotateAxisY, d.CameraRotateAxisZ), d.CameraRotateAngle); var rotateTransform3D = new RotateTransform3D(axisAngleRotation3D); transform3DGroup.Children.Add(scaleTransform3D); transform3DGroup.Children.Add(translateTransform3D); transform3DGroup.Children.Add(rotateTransform3D); tbViewPort.Transform = transform3DGroup; } </code></pre> <p>Hopefully, I didn't forget anything. If you need more help or don't understand something, please don't hesitate to ask ;-)</p>
 

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