lookat(3G) lookat(3G)
NAME
lookat - defines a viewing transformation
SPECIFICATION
C lookat(vx, vy, vz, px, py, pz, twist)
Coord vx, vy, vz, px, py, pz;
Angle twist;
FORTRAN subroutine lookat(vx, vy, vz, px, py, pz, twist)
real vx, vy, vz, px, py, pz
integer*4 twist
DESCRIPTION
lookat defines the viewpoint and a reference point on the
line of sight in world coordinates. The viewpoint is at
(vx, vy, vz). The viewpoint and reference point (px, py, pz)
define the line of sight. twist measures right-hand
rotation about the z-axis in the eye coordinate system.
SEE ALSO
polarview
Programming Guide, Section 4.2, Viewing Transformations
Page 1 (printed 8/20/87)