example slide

  #@include proto-slideset.vr
  #@include proto-slide.vr
  #@include proto-text.vr
  #@include proto-line.vr
  #@include proto-break.vr
  
  
  
  DEF slides slideset {
   slides [
      slide {
          children [
                  text { 
                          lines [
                            line {
                              string ["What about the slide format?"]
                              }
                            break { }
                            line {
                              string ["yeh, what about it?"]
                              }
                            break { }
                          ] ## lines
                  }
                  Sphere { radius 0.5 }
          ] ## children
      } ## slide 1
      slide { ## 2
          children [
                  Sphere { radius 0.5 }
          ] ## children
      } ## slide 2
   ]  ## slides
  }