Rafael Santin, Claudio Kirner.
This paper discusses two interaction techniquesused to put virtual objects in Augmented Reality AuthoringEnvironment. Slope and occlusion of markers are techniquesthat allow the user putting together virtual objects in a simpleway, minimizing difficulties during the virtual objectshandling.
http://www.lbd.dcc.ufmg.br/colecoes/wra/2006/0017.pdf
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