id: 04072236
dt: j
an: 04072236
au: Boese, F.G.
ti: Surface drawing made simple - but not too simple.
so: Comput.-Aided Des. 20, No.5, 249-258 (1988).
py: 1988
pu: Elsevier Science, Oxford
la: EN
cc: 
ut: surface plotting in $R\sp 3$; line drawing devices; viewing models;
    parallel projection; hidden-line removal; image plane parametrization
ci: 
li: doi:10.1016/0010-4485(88)90070-X
ab: Let f(x,y) be a real, single-valued continuous function of two real
    variables x, y defined over an axes-parallel rectangular domain D. The
    problem considered was to visualize the surface piece in $R\sp 3$
    defined by $z=f(x,y)$ using line drawing devices. After parallel
    projection onto an image plane S orthogonal to the viewing direction,
    hidden-line segments are to be removed. Three different viewing models
    are considered. A version of the hidden-line removal is presented that
    generalizes the base of an algorithm of Butland in that (almost) all
    viewing directions are now allowed. The present solution of the task
    already treated several times is based on a parametrization via the
    horizontal position of the image point in S. The visibility of the
    computed points is exactly determined as opposed to interpolated. A
    thorough description of the problem is given.
rv: