HoloDraw File Format

text2:1 2 3,Hello, World!
   

Separator {
 BaseColor {
  rgb [ 0.8 0.8 0.8 ]
 }
 Font {
  name "Times-Roman"
  size 12
 }
 Transform {
  translation 1 2 3
 }
 Text2 {
  string "Hello, World!"
  justification LEFT
 }
}  

Transform {
 translation 1 2 3
 children [
  Billboard {
   axisOfRotation 0 0 0
   children [
    Shape {
     appearance Appearance {
      material Material {
       diffuseColor 0 0 0
       ambientIntensity 0.0
       shininess 0.0
       emissiveColor 0.8 0.8 0.8
      }
     }
     geometry Text {
      fontStyle FontStyle {
       family [ "Times-Roman", "PLAIN" ]
       justify "BEGIN"
       size 1
       style "PLAIN"
      }
      string "Hello, World!"
     }
    }
   ]
  }
 ]
}  

• make sure that drawwrl.pl sees another speed setting after the one from drawbbox.pl (the second speed setting will override the first)
• explicitly tell drawbbox.pl what speed you want by passing a speed value in the input stream to drawbbox.pl, or
• use grep to exclude the speed produced by drawbbox.pl, so that the speed from drawbbox.pl does not override speed you previously set. (See the sphere tutorial for some tricks with the speed setting.)

This is used with viewpoint objects. If while viewing a 3D world you want to move to another viewpoint, viewjump=TRUE will teleport you instantly to the new location, while viewjump=FALSE (the default) will gradually fly you from here to there.

Normally the smooth flight effect is more pleasant, so leave the setting at viewjump=FALSE. However if you have a big complicated world that takes a long time to render, you might not want to wait for that animation to play itself out. Set viewjump=TRUE to get there faster.

Puts a viewpoint (AKA camera) at coordinates 0 0 -20. You can have as many viewpoints as you want. drawbbox.pl will make a few for you, but you can add more or even eliminate the ones it makes (using "grep -v viewpoint") if you don't want them. When your image loads in a VRML browser, you will usually start out viewing your scene from the first viewpoint that exists in your .wrl file.

The second part, 0 1 0, 3.14159265358979 in this example, is optional but you'll probably need it. The first point tells where the camera should be, and this part tells which way the camera should be looking. This is specified using an axis (the 0 1 0) and rotation (3.14159265358979).

Imagine that the axis is a line drawn from 0 0 0 to whatever point you specify in your axis parameter. In this case an axis value of 0 1 0 represents an axis line going straight up in the "Y" direction. The rotation parameter tells how far the camera should be rotated around that axis. The value is expressed in radians. 3.14159265358979 radians is 180 degrees. So this viewpoint instruction says "Move the camera -20 units in the Z direction, but then turn it 180 degrees about the Y axis so that it is looking back toward the origin."

The final parameter, which is also optional, allows you to name your viewpoint. If you don't provide a name (or if you use the same name twice) HoloDraw will generate a unique name by appending numbers as necessary.

Viewpoints are not currently supported for VRML 1 output.