Now can view blocks instead of just walls. Angle of view and distance from block supported. Doesn't yet handle both sides of a block. (ie field of vision is always in the forward direction - no looking back) Height of viewer is not going to be alterable, so you'll never see the top surface of blocks. (a crude technique but it means you only ever draw 2 faces out of 6 for any cube) Ceiling and floor may need to be drawn with the pen. TO DO: alter the luminosity according to the angle of incidence with the light source... (depends if this is a moving block or a moving viewer of course...)
