/// <summary>
/// Finds the nearest point and its normal.
/// </summary>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="position">
/// The position.
/// </param>
/// <param name="point">
/// The point.
/// </param>
/// <param name="normal">
/// The normal.
/// </param>
/// <param name="model">
/// The model.
/// </param>
/// <returns>
/// The find nearest.
/// </returns>
public static bool FindNearest(this Viewport3DX viewport, Point position,
out Vector3 point, out Vector3 normal, out Element3D model)
{
point = new Vector3();
normal = new Vector3();
model = null;
var camera = viewport.Camera as ProjectionCamera;
if (camera == null)
{
return(false);
}
var hits = FindHits(viewport, position);
if (hits.Count > 0)
{
point = hits[0].PointHit;
normal = hits[0].NormalAtHit;
model = hits[0].ModelHit as Element3D;
return(true);
}
else
{
// check for nearest points in the scene
// TODO!!
return(false);
}
}
private void Element3DPresenter_ContentChanged(object sender, Element3D content)
{
if (currentContent != null)
{
(SceneNode as GroupNode).RemoveChildNode(currentContent.SceneNode);
AttachChild(null);
}
if (Content is Element3D elem)
{
currentContent = elem;
(SceneNode as GroupNode).AddChildNode(elem.SceneNode);
AttachChild(elem);
}
}
/// <summary>
/// Finds the nearest point and its normal.
/// </summary>
/// <param name="viewport">
/// The viewport.
/// </param>
/// <param name="position">
/// The position.
/// </param>
/// <param name="point">
/// The point.
/// </param>
/// <param name="normal">
/// The normal.
/// </param>
/// <param name="model">
/// The model.
/// </param>
/// <param name="node"></param>
/// <returns>
/// The find nearest.
/// </returns>
public static bool FindNearest(this Viewport3DX viewport, Point position,
out Vector3 point, out Vector3 normal, out Element3D model, out SceneNode node)
{
model = null;
node = null;
if (viewport.FindNearest(position.ToVector2(), out point, out normal, out var m))
{
if (m is Element3D ele)
{
model = ele;
node = ele.SceneNode;
}
else if (m is SceneNode nd)
{
node = nd;
model = null;
}
return(true);
}
return(false);
}
/// <summary>
/// Traverses the Visual3D/Element3D tree and invokes the specified action on each Element3D of the specified type.
/// </summary>
/// <typeparam name="T">
/// The type filter.
/// </typeparam>
/// <param name="element">
/// The element.
/// </param>
/// <param name="function">
/// The action.
/// </param>
public static void Traverse <T>(this Element3D element, Func <T, bool> function) where T : Element3D
{
var sceneNode = new SceneNode[] { element.SceneNode };
Traverse(element, function);
}
/// <summary>
/// Traverses the Visual3D/Element3D tree and invokes the specified action on each Element3D of the specified type.
/// </summary>
/// <typeparam name="T">
/// The type filter.
/// </typeparam>
/// <param name="element">
/// The element.
/// </param>
/// <param name="action">
/// The action.
/// </param>
public static void Traverse <T>(this Element3D element, Action <T> action) where T : Element3D
{
var sceneNode = new SceneNode[] { element.SceneNode };
Traverse(element, action);
}