#### User representation file ####

- The size of a user representation is limited to 
  VR_MAX_USER_REPRESENTATION, defined in src/vr_defs.h. 

- Do not set fillstyle nor resolution attributes.

- Do not model the top primitive ( == $THIS) itself. Of couse,
  you can model its children.

- Do only use standard YART primitives, i.e. no primitives from
  scientific package. 

- Do not use my representation (etc/sample.rpr) cos I don't want to
  be cloned.

- All children must redirect the pick to the father object. Set 
  "-pickmode 2" for every primitive with exception of $THIS.

- Your initial viewpoint is in 1,75 meters height (in y direction).

- You representation should start at y == 0.

- Your initial view direction is in +z direction. 

#### Scene representation file ####

- Do not set fillstyle nor resolution attributes!!! Users on low-end
  maschines will be happy about. For such things use your ~/.vr_userrc

- Object names must not start with "us" 

- Class names must not start with "US"

- The scene is named "sc" and is already created

- Do not use textures, mappings, etc. cos these will not transferred
  to the remote users (this could be changed in a later release)

- top primitives and light sources have to be inserted into "sc"

* scene set up commands:

   - VR_position { x y z } -- initial position for a user put into the 
                              scene, default: { 0 0 0 }
   - VR_angle angle        -- initial angle around the y axis, measured
                              from the z axis, default: 3.14 (looking
                              into -z direction)
   - VR_maxUsers number    -- how many users the scene allows, default: 10

   - VR_msg txt            -- message about the scene sent to user when he logs in
