HiddenLineDrawingParametersSetViewport Method 
Name  Description  

SetViewport(RhinoViewport) 
Set the viewport for the hidden line drawing (HLD). The viewport supplies
the projection that determinest he visibility of curves, and the HLD
coordinate system in which the resulting curves are represented. The
HLDcoordinate system is a right handed system for 3D model space, in
which the 3rd coordinate direction is the projection direction. In particular
the zcoordinate direction points from the scene toward the camera.
 
SetViewport(ViewportInfo) 
Set the viewport for the hidden line drawing (HLD). The viewport supplies
the projection that determines the visibility of curves, and the HLD
coordinate system in which the resulting curves are represented. The
HLDcoordinate system is a right handed system for 3D model space, in
which the 3rd coordinate direction is the projection direction. In particular
the zcoordinate direction points from the scene toward the camera.
