Color, Transparency, and Emissivity
===================================

Every object has a *color* (the default is white).  In addition, most objects may be made transparent by adjusting their *opacity*,  and the objects can be made to glow by adjusting their *emissive* attribute.

.. toctree::
   :maxdepth: 1

   Color <color>
   Opacity <opacity>
   Emissive <emissive>