Comparison of 3-D display formats for CAD applications

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McWhorter, Shane William
Hodges, Larry F.
Rodriguez, Walter
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Two experiments were performed to rank different types of display formats common to CAD applications in terms of geometric information conveyed and perceived realism of objects. Display types tested were: wireframe, wireframe with hidden lines removed (HLR), shaded solid, orthogonal multi-view, stereoscopic wireframe, stereoscopic HLR, and stereoscopic shaded solid. The results of the geometric information experiment indicated that the orthogonal multi-view display was judged inferior to both the non-stereo and stereo pictorial displays and that the stereo displays were judged superior to the non-stereo displays in providing geometric information to the subject. Individual preferences among subjects, however, varied widely. The results of the realism experiment indicated that the flat shaded stereo, HLR stereo, and the flat shaded display types were judged to be equivalent and most realistic. The wireframe stereo, HLR and wireframe displays were judged to be equivalent and less realistic. The orthogonal views display was judged to be the least realistic.
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