On the first load up of CADRazor, the display defaults to an internal CADRazor-
shading routine. This is not the standard OpenGL lighting routine (which can be
activated). The CADShader is a very efficient, high frame-rate inertial shader and
can be used to illuminate models and provide rapid display shading, more efficient
that the OpenGL lighting model:
The user can adjust shading by selecting the following from the context menu:
In the next section, we will show how this is toggled with the standard OpenGL
lighting model.
