olemus
raalgraafikas:
alati vaataja poole pööratud
kahemõõtmeline element
kolmemõõtmelises ruumis

Wiktionary:
4. (computer graphics) a sprite that always faces the screen, no matter which direction it is looked at from

ülevaateid
https://en.wikibooks.org/wiki/Cg_Programming/Unity/Billboards

http://www.computer-graphics.se/TSBK07-files/pdf17/10c%20Billboards.pdf

www.opengl-tutorial.org/intermediate-tutorials/billboards-particles/billboards/

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