Persistence of Vision Ray Tracer Include File 
Part of the IRTC GIP object archives 
Version: 1.0

Macro: IR_RoadBridge
   (RBBridgeLength, RBRailingLength, RBWidth, SidewalkLevel, WaterLevel)
Object Description: A stone bridge for leading a road over a 
                    4m wide stream. 
Author: Ib Rasmussen
Email: ir@ibras.dk
Web page: http://www.ibras.dk/
Date (yyyy-mm-dd): 2000.01.25

Origin: Center of bridge. 
Orientation: Road along x-axis, stream along z-axis.
Dimensions: 1 unit = 1 cm
Size: x-axis: -RBBridgeLength/2 to RBBridgeLength/2
      y-axis: 366
      z-axis: -RBWidth/2 to RBWidth/2

Includes required: colors.inc, stones1.inc, infr011n.ttf 
Example: object { IR_RoadBridge(1600, 640, 1000, 140, -50) }
Variables: 

Comments: The length of the bridge side and the bride railing
          are controlled individually by . 
          A road and sidewalk surface has to be added by the
          calling scene file, as does a water surface.
          The bridge is designed for a difference between 
          SidewalkLevel and WaterLevel about 200-250 cm.
          The bridge side is designed to disappear into the 
          banks at each side of the stream or canal.    
          The top of the wall is translated to SidewalkLevel.
          WaterLevel is used to place a band of algae just above
          the water line.
           
          REMEMBER to declare the variable FontPath to point at the 
          directory containing the TrueType font INFR011N.TTF before 
          including this file.
          Example: #declare FontPath="c:\\winnt\\fonts\\"
