View3D

private void Getinfo_View3D(View3D view3D)
{
    string message = "View3D: ";

    // The position of the camera.
    XYZ eyePosition = view3D.GetOrientation().EyePosition;
    message += "\nCamera position: " + eyePosition;

    // Identifies whether the view is a perspective view. 
    if (view3D.IsPerspective)
    {
        message += "\nThe view is a perspective view.";
    }

    // The section box of the 3D view can cut the model.
    if (view3D.IsSectionBoxActive)
    {
        BoundingBoxXYZ sectionBox = view3D.GetSectionBox();

        // Note that the section box can be rotated and transformed.  
        // So the min/max corners coordinates relative to the model must be computed via the transform.
        Transform trf = sectionBox.Transform;

        XYZ max = sectionBox.Max; //Maximum coordinates (upper-right-front corner of the box before transform is applied).
        XYZ min = sectionBox.Min; //Minimum coordinates (lower-left-rear corner of the box before transform is applied).

        // Transform the min and max to model coordinates
        XYZ maxInModelCoords = trf.OfPoint(max);
        XYZ minInModelCoords = trf.OfPoint(min);

        message += "\nView has an active section box: ";
        message += "\n'Maximum' coordinates: " + maxInModelCoords;
        message += "\n'Minimum' coordinates: " + minInModelCoords;
    }
    TaskDialog.Show("Revit", message);
}