PERSPECTIVE
Keywords: greg

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PERSPECTIVE

            [GREG2\]PERSPECTIVE [Altitude  Azimuth]  [/FACTOR  Fv  Ov]  [/LOWER]
        [/LINES]  [/STEP Nsx Nsy] [/AXES Xmin Xmax Ymin Ymax] [/CENTER] [/VERTI-
        CAL Vmin Vmax]

        Makes a parallel projective view of the Regular Grid array, with  hidden
        lines  removed.  If  /LINES option is present, lines along a single axis
        are plotted. Altitude and Azimuth are the values  of  the  corresponding
        viewing  angles  in  Degrees. Default values are 30 and 45 at the begin-
        ning, and then the last values given. The upper part  is  drawn,  unless
        the /LOWER option is present.

        Automatic scaling to match approximately the current box is used, but it
        is only a rough guess and may fail if extrema of the Regular Grid occurs
        near  the edges. Fine tuning of the plot scale can be obtained using the
        /FACTOR option. It controls scaling of the Regular Grid  values  by  the
        factor  Fv (default 1) and an offset Ov which is in physical units along
        the Y direction of the plot.

        The Regular Grid array is plotted according to the  orientation  implied
        by  command LIMITS, but the whole array is plotted. The /STEP option may
        be used to indicate to take only 1 pixel over Nsx ones for  the  X  axis
        (resp.  Nsy and Y). The /AXES option plots (X,Y) axes. The /VERTICAL op-
        tion controls the max, min of plotted perspective and plots  a  Z  axis.
        The /CENTER option centers the perspective. BLANKED PIXELS are forced to
        the minimum value of the map, or the Vmin value when the  /VERTICAL  op-
        tion is in use.