Autah-gr.389
net.games
utzoo!decvax!harpo!utah-cs!utah-gr!thomas
Wed May 5 10:26:21 1982
Re: color displays
1. Evans and Sutherland manufacture the Picture System 2 color display,
which uses a standard color tv display, but which is a vector drawing
device. This is then a 'full range, 3 color' vector display.
2. If a display does not flicker with a low complexity image, but does
flicker with a more comples image, then it is almost certainly a vector
display. The rate of raster refresh does not change with image complexity.
3. Assuming sufficient resolution in the display tube, a vector display will
always look better than a raster display (without anti-aliasing), at least
at current display resolutions. Once we get up to 4k x 4k or so, this may
not be true because the display resolution will exceed that of the eye at
normal viewing distances, but theoretically, lines drawn on a raster display
(again, without anti-aliasing) will always look 'jaggy', as opposed to the
smooth lines obtainable on a vector display. The TEMPEST game which started
this whole discussion has a fairly coarse resolution color tube, the stripes
of color in the trinitron tube make it look like a raster display. This
fooled me at first.
4. A vector display always has an upper limit on the number of vectors it can
display without flicker. A raster display is limited only by the number of
vectors which can be resolved (i.e., you put too many vectors on a raster
display and you just get an indistinguishable blob).
=Spencer (harpo!utah-cs!thomas thomas@utah-20)
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