|void d3scale (x, y, z, xp, yp)||D3PLT.C||Level 3|
|float x, y, z||The coordinates of a point in 3-D space in user units.|
|int *xp, *yp||The projected 2-D location of the point in GraphiC pixel space.|
|d3scale() converts 3-D x, y, z coordinates
into projected xp, yp coordinates in Tektronix 8192 space.
The arguments *xp and *yp are the addresses of the xp
and yp variables passed in, not arrays. d3scale() allows
you to determine the two-dimensional position of an object in three-dimensional
space. This facility is used, for example, by d3pltfnt()
determine the location at which to plot the string.
This routine will be obsolete in the future and usertopix() should be used instead.