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> ## 3.10 3D graphics interfaces You can combine Yorick's graphical primitives to create your own graphics interfaces. The Yorick distribution includes a simple 3D graphics interface built in just this way. Study the ``pl3d.i'` library file if you need an example of how to do this. Before you can access the 3D functions, you need to include either ``plwf.i'` or ``slice3.i'`, which provide the highest level 3D interfaces. The ``plwf.i'` interface lets you plot scalar functions of two variables (like plc or plf). The ``slice3.i'` interface allows you to plot isosurfaces and slices of scalar functions of three variables. The ``demo5.i'` demonstration program in the Yorick distribution has examples of both; study it to see how they work in detail.
> 3.10.1 Coordinate mapping |  | Changing your viewpoint.
> 3.10.2 Lighting |  | The 3D lighting model.
> 3.10.3 gnomon |  | Gnomon indicates axis orientation.
> 3.10.4 plwf interface |  | The plot wire frame interface.
> 3.10.5 slice3 interface |  | The slice and isosurface interface.