camera¶

place the camera and redraw the scene
NAME
    camera - place the camera and redraw the scene

SYNOPSIS
    camera [ex ey ez ax ay az]

DESCRIPTION
    Puts the camera AT the eye point (ex,ey,ez) LOOKING AT the aim point
    (ax,ay,az), both in world units (keep each coordinate within about
    +/-16383), then redraws the geometry engine's persisted scene from
    that viewpoint -- the same tri-built world or cube aftermath, seen
    from anywhere. World +y is up; aiming straight up or down keeps a
    fallback horizon. With no arguments the camera returns to the origin
    looking down +z. The focal length is whatever the scene set (256 by
    default: a point 256 units ahead maps 1:1). Needs the engine.

    The view is the g3d look-at (man g3d): forward, right and true-up are
    built from the two points and normalized with the library's 32-bit
    integer square root -- a few tenths of a second per invocation.

EXAMPLES
    tri -80 -80 300 80 -80 300 0 40 420 f 31 0 0
    camera -300 100 360 0 0 360    from up-left of the triangle
    camera 0 0 900 0 0 0           from behind the scene, looking back
    camera                         home: origin, looking down +z

SEE ALSO
    rotate, tri, cube, g3d