Avaliando o impacto da utilização de renderizações panorâmicas para a navegação em ambientes virtuais
Panoramic rendering is the visualization of three-dimensional objects in a virtual environment through a wide viewing angle. This work investigated if the use of panoramas is able to promote faster searches in a virtual environment. Panoramas allow the presentation of space through less need to c...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/18689 |
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| Resumo: | Panoramic rendering is the visualization of three-dimensional objects in a virtual environment
through a wide viewing angle. This work investigated if the use of panoramas
is able to promote faster searches in a virtual environment. Panoramas allow the presentation
of space through less need to change the orientation of the camera, especially for
the case of projections spanning 360º surrounding the user, which can benefit searching.
However, the larger the angle, more distorted is the visualization of the environment,
causing confusion in navigation. The distortion is even bigger when the user changes
the pitch of the camera, by looking up or down. In this work we developed a technique
to eliminate specifically the distortions caused by changes in pitch, which was called
hemispheric projection. Experiments were done to evaluate the performance of search
navigation through perspective, cylindrical and hemispherical projections. The results
indicate that navigating with perspective projection is superior than navigating with panoramic
projections, possibly due to factors such as (i) lack of experience of the participants
in understanding the scenes displayed as panoramas, (ii) the inherent presence of distortion
in panoramic projections and (iii) a lower display resolution because the objects are
presented in smaller sizes in panoramic projections, making the perception of details more
difficult. However, the hemispherical projection was better than the cylindrical, indicating
that the developed technique provides benefits for navigation compared to current techniques
of panoramic projection. The hemispheric projection also provided the least amount
of changes of camera orientation, which is an indication that the hemispheric projections
may be particularly useful in situations where there are restrictions on the ease to change
the orientation. Future research will investigate the performance of cameras interactions
on slower devices, such as using only keyboard, or brain-machine interfaces |
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