/// <summary>
/// Updates the clipping object.
/// </summary>
private void UpdateClipping()
{
var vp = Visual3DHelper.GetViewport3D(this);
if (vp == null)
{
return;
}
this.Clipping = new CohenSutherlandClipping(10, vp.ActualWidth - 20, 10, vp.ActualHeight - 20);
}
/// <summary>
/// Zooms to fit the extents of the specified viewport.
/// </summary>
/// <param name="actualCamera">
/// The actual camera.
/// </param>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="animationTime">
/// The animation time.
/// </param>
public static void ZoomExtents(PerspectiveCamera actualCamera, Viewport3D viewport, double animationTime)
{
var bounds = Visual3DHelper.FindBounds(viewport.Children);
var diagonal = new Vector3D(bounds.SizeX, bounds.SizeY, bounds.SizeZ);
if (bounds.IsEmpty || diagonal.LengthSquared == 0)
{
return;
}
ZoomExtents(actualCamera, viewport, bounds, animationTime);
}
/// <summary>
/// The composition target_ rendering.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The event arguments.
/// </param>
protected void OnCompositionTargetRendering(object sender, EventArgs e)
{
if (!Visual3DHelper.IsAttachedToViewport3D(this))
{
return;
}
if (this.UpdateTransforms())
{
this.UpdateClipping();
this.UpdateGeometry();
}
}
/// <summary>
/// Updates the transforms.
/// </summary>
/// <returns>
/// True if the transform was changed.
/// </returns>
public bool UpdateTransforms()
{
var newTransform = Visual3DHelper.GetViewportTransform(this.visual);
if (double.IsNaN(newTransform.M11))
{
return(false);
}
if (!newTransform.HasInverse)
{
return(false);
}
if (newTransform == this.visualToScreen)
{
return(false);
}
this.visualToScreen = this.screenToVisual = newTransform;
this.screenToVisual.Invert();
return(true);
}
