Author: Quinton Roberts (Eclipzer)
  Date:   07/16/06
  Update: 06/05/08

  Voxel - Vol-umetric pi-xel

  A voxel is a 3D extension of a pixel. Where pixels are 2D squares, voxels are 3D cubes. By stacking the
  cubes next to and on top of each other we can construct 3D models. The voxel, therefore, is our basic
  building block, similar to legos.

  Voxels let us explore a different method for 3D storage and rendering.

  VOXEL: VO-lumetric Pi-XEL

  VOXEL MODEL: 3D model constructed of voxels

  CONTAINMENT CUBE: A cube which containing the smaller cubes which comprise a voxel model.

    *every voxel is similar to its containment cube, therefore their vertices can be determined by
     interpolating across the back face edges of the containment cube.

  Visible Faces
  -------------
  A solid cube can only display, at most, three of its six faces at any given time. Because every voxel is
  similar to its containment cube, the visible faces of each voxel will be identical to the visible faces
  of the containment cube.

  Rendering
 ----------------------------------------------------------------------------------------------------------
  Since the only difference between the voxels in a voxel model is position and color, we can produce fast
  accurate rendering by rendering a single voxel to a buffer. We then draw the buffer for each voxel in
  the model, interpolating across the containment cube to determine position. Simply substitute the 
  appropriate colors when rendering the buffer. By rendering cubes bottom to top, back to front, we don't
  have to worry about sorting the voxels.

  To improve rendering further, we can apply an alpha value at the buffer voxel edges.


  Other rendering methods include filled squares, rectangles and circles. Meta balls.


  Editing Models (2D)
  -------------------
  Since a voxel model is a collection of similar cubes within a containment cube, the voxels naturally form
  2D layers within the cube. These layers can be edited using convential 2D editing tools.