ALPHAMAP - Set a figure's AlphaMap property

  ALPHAMAP(MATRIX)     - Set the current figure's AlphaMap property to MATRIX.
  ALPHAMAP('default')  - Set the AlphaMap to it's default value.
  ALPHAMAP('rampup')   - Create a linear alphamap with increasing opacity.
  ALPHAMAP('rampdown') - Create a linear alphamap with decreasing opacity.
  ALPHAMAP('vup')      - Create an alphamap transparent in the center, and
     linearly increasing to the beginning and end.
  ALPHAMAP('vdown')    - Create an alphamap opaque in the center, and
     linearly decreasing to the beginning and end.
  ALPHAMAP('increase') - Modify the alphamap making it more opaque.
  ALPHAMAP('decrease') - Modify the alphamap making it more transparent.
  ALPHAMAP('spin')     - Rotate the current alphamap.

  ALPHAMAP(PARAM, LENGTH) - For Parameters which create new maps, create
                         them with so they are LENGTH long.
  ALPHAMAP(CHANGE, DELTA) - For parameters which change the alphamap, use
                         DELTA as a parameter.

  ALPHAMAP(FIGURE,PARAM) - Set FIGURE's AlphaMap to some PARAMeter.
  ALPHAMAP(FIGURE,PARAM,LENGTH)
  ALPHAMAP(FIGURE,CHANGE)
  ALPHAMAP(FIGURE,CHANGE,DELTA)

  AMAP=ALPHAMAP         - Fetch the current alphamap
  AMAP=ALPHAMAP(FIGURE) - Fetch the current alphamap from FIGURE.
  AMAP=ALPHAMAP(PARAM)  - Return the alphamap based on PARAM
       without setting the property.