/// <summary>
/// Picks an object in 3D space.
/// </summary>
internal List <SceneObject> Pick(Vector3 rayStart, Vector3 rayDirection, ViewInformation viewInformation, PickingOptions pickingOptions)
{
rayDirection.EnsureNormalized(nameof(rayDirection));
viewInformation.EnsureNotNull(nameof(viewInformation));
pickingOptions.EnsureNotNull(nameof(pickingOptions));
// Query for all objects below the cursor
List <Tuple <SceneObject, float> > pickedObjects = new List <Tuple <SceneObject, float> >();
foreach (SceneLayer actLayer in m_sceneLayers)
{
foreach (SceneObject actObject in actLayer.Objects)
{
if (!actObject.IsVisible(viewInformation))
{
continue;
}
if (!actObject.IsPickingTestVisible)
{
continue;
}
float actDistance = actObject.Pick(rayStart, rayDirection, viewInformation, pickingOptions);
if (!float.IsNaN(actDistance))
{
pickedObjects.Add(Tuple.Create(actObject, actDistance));
}
}
}
// Return all picked object in correct order
return(pickedObjects
.OrderBy((actObject) => actObject.Item2)
.Convert((actObject) => actObject.Item1)
.ToList());
}
/// <summary>
/// Picks an object in 3D-World.
/// </summary>
/// <param name="rayStart">Start of picking ray.</param>
/// <param name="rayDirection"></param>
/// <param name="viewInfo">Information about the view that triggered picking.</param>
/// <param name="pickingOptions">Some additional options for picking calculations.</param>
/// <returns>Returns the distance to the object or float.NaN if object is not picked.</returns>
internal virtual float Pick(Vector3 rayStart, Vector3 rayDirection, ViewInformation viewInfo, PickingOptions pickingOptions)
{
return(float.NaN);
}