SUBROUTINE SYM3DH

 SYM3DH plots an ASCII string (see SYMBOL) in 3-d using either  PLT3DH\ or SKETCH. The symbols are plotted in the plane defined by a,b,g.

CALL SYM3DH (x,y,z,a,b,g,s,n,i)

x,y,z (R): lower-left corner of string
           If x=999, y=999, z=999 then string is continued from
           lower right of previous SYM3DH or NUM3DH call
a,b   (R): angles from the x-y, x-z planes (in deg) of the ray
           from (x,y,z) along the base of the character string
g     (R): angle of rotation about the ray defined by a,b (deg)
h     (R): height of the string to be plotted in plot units
s     (C): text to be plotted
n     (I): number of characters in string s
i     (I): hidden line option flag
           = 0 : use PLT3DH
           = 1 : use SKETCH