
			Changes for RDSGEN 1.2


New Features:

1. Algorithm 4 add using a more realistic offset calculation as
   documented in "The Geometry of SIRDS Generation form Ray Traced
   Sources."

2. Replaced the type 3 TGA output with type 2, for compatability
   reasons.

3. The width switch (-w) added to compensate for large output
   devices.  Specifies the output device width in inches (default 10).

4. Adaptive background support (-b switch) has been expanded to
   include input created from POVRAY.  This improves the depth-of-
   field for ray tracers forced to use the fog function.

5. The extrapolate switch (-e) added to improve image quality when
   using background maps.  This function can be used to eliminate
   traces left by the echo suppression routines.

6. The origin switch (-o) added to control the starting column for
   image processing.  The RDS is created by a scanning process from
   the origin column out, in either direction, to the edges.  The
   default value, zero, causes scanning from the left edge to the
   right edge.  Valid values are 1 to the image width.   

7. The background shift switch (-x) controls the placement of the
   background map.  The background GIF file is rotated to the right
   the specified number of pixels.  This feature is useful for hiding
   the "seam" between strips.

8. The depth map shift switch (-y) controls the placement of the
   image on the screen.  The input data is shifted right the
   specified number of pixels.  This feature can be used to
   compensate for the left-shift inherent to algorithm one.


Fixes:

1. Error calculating the background offset when using the -n switch.

2. Bottom-up TGA sensitivity.

3. Improvement to background in algorithm three for animation purposes.

4. Premature EOF reading GIF object with gray-scale color map.


Deletion:

1. Printer support (what there was) has been deleted.  Users wishing
   to print their output should create GIF files and print them with
   a GIF print utility.  PRINTGF, PICLABS, and GWS are just a few of
   the fine programs available in the "Graphics Support" forum that 
   can perform this function.  
   
