Ray Trace for IMAGEN printers (impress)

[Geoffrey Cooper]

A bug fix to the display program for sending the ray trace output
to an imagen printer: prerasterization is necessary.  You can accomplish
this by changing the program:
	printf("@document(language impress)");
to
	printf("@document(language impress, prerasterization on)");

or you can just prefix the output with a little header that says the
same thing.  On a 4.2 unix system (note the -n option to echo):

	echo -n "@document(prerasterization on)" | cat - myfile > myfile.new

- Geof Cooper