From: anne001 <anne@...>
Date: 2006-03-25T19:43:53+09:00
Subject: Re: meaning of *array

I used it with opengl. Opengl fx expect arrays of 3 or 4 vectors
(location of points in space, color, etc)

so I entered my data in arrays
scale=[2.0, 0.3, 1.0]
translation=[0.0, 0.0, 0.0]
jointP = [-scale[0]/2, 0, 0]
rotation = [$elbow, 0.0, 0.0, 1.0]
draw = proc { GLUT.WireCube(1.0)}
lowerarm= Node.new(scale,translation, jointP, rotation,&draw)

  def initialize(scale, translation, jointP, rotation, &draw)
    @children = []
    @scale = scale
    @Translation = translation
    @jointP = jointP
    @rotation = rotation
    @draw = draw
   end

but then when I called GL functions, I had to use *
  def applytransform
    GL.PushMatrix();
    GL.Translate(*@Translation);
    if @parent != nil
      GL.Translate(*@parentjointP);
    end
    GL.Rotate(*@rotation);
    GL.Translate(*@jointP.minus);
  end

Otherwise the GL fx complained it did not get the number of parameters
it wanted.