SUBROUTINE XFRM3D

 XFRM3D uses the same scaling and origin as PLT3DH and SKETCH to transform a 3-d points to screen (PLOT) coordinates.

CALL XFRM3D (x,y,z,x1,y1,z1)

x,y,z    (R): input coordinates of point (in 3 space)
x1,y1,z1 (R): (returned) transformed coordinates of point (in 3 space)