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The increasingavailability of 3D input and output devices demands a better understanding and comparison of their quality. This report describes an empirical experiment for comparing 3D display modes: traditional perspective viewing, anaglyph stereo and shutter glass stereo. We followed two hypotheses 1. shutter glass stereo viewing allows a faster and more accurate recognition than the anaglyph and the perspective viewing, and 2. subjects experienced with particular 3D representationsare faster and more accurate than subjects without experience. The experiment is based on a true research scenario in organic chemistry. Organic molecules were used as 3D objects.Mean response error and mean response time were calculated for a series of six tasks and 81 subjects.

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U n i v e r s i t y o f P a d e r b o r n , D e p t . o f C o m p u t e r S c i e n c e Ftirstenallee 11, D -3 3 0 1 0 2 P a d e r b o r n , G E R M A N Y + 4 9 5251 6 0 6 6 2 2 s a b a r o @ u n i -p a d e r b o r n . d e ABSTRACTThe increasing development of three-dimensional environments for the World Wide Web and of threedimensional educational software demands a better understanding of children's navigation in virtual 3D environments. This work will compare navigation mechanisms between children and adults to identify and model prerequisites which will allow children to navigate effectively in such environments.

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