Level 2 Help for PERSPEC

IBIS 3-D graphics file name.

If an output file is specified then a perspective transformation will be
performed and the result output in an 2-D IBIS graphics file.  The output
is in (X,Y) format.

The elevation angle of the observer in degrees above the horizon.

The azimuthial angle of the observer in degrees east of north where 
north is the y direction.  Default is to look from the south (180 degrees).

The distance of the observer from origin (in same units as graphics file).  
This controls the amount of perspective. 

The 3-D location of the origin toward which the observer looks.  
In same format as the 3-D graphics file (e.g. XYZ, LSZ).

Divisor scale factor to convert scale of Z values same scale as the 
X and Y values.

The 3-D graphics-1 file contains triplets of real numbers.  
The DATAFORM parameter specifies the format of the triplet:  
XYZ for (X,Y,Z),  YXZ for (Y,X,Z),  LSZ for (line,sample,Z).