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Issue No.06 - Nov.-Dec. (2011 vol.31)
pp: 68-83
P. Rosen , Univ. of Utah, Salt Lake City, UT, USA
ABSTRACT
Researchers have used depth images to approximate scene geometry in a variety of interactive 3D graphics applications. Previous researchers constructed images using orthographic or perspective projection, which limits the approximation quality to what's visible along a single view direction or from a single viewpoint. Images constructed with nonpinhole cameras can improve approximation quality at little additional cost, if the camera offers fast projection. For such a camera, the fundamental operation of ray-and-depth-image intersection proceeds efficiently by searching along the 1D projection of the ray onto the image. A proposed method extends epipolar geometry constraints to nonpinhole cameras for two-camera configurations. Researchers have demonstrated nonpinhole depth images' advantages in the context of reflections, refractions, relief texture mapping, and ambient occlusion. The Web extra is a video that shows how nonpinhole depth images provide advantages regarding reflection, refraction, relief texture mapping, and ambient occlusion.
INDEX TERMS
rendering (computer graphics), approximation theory, geometry, interactive systems, reflections, nonpinhole approximations, interactive rendering, scene geometry, interactive 3D graphics applications, perspective projection, orthographic projection, ray-and-depth-image intersection, epipolar geometry constraints, refractions, relief texture mapping, ambient occlusion, Cameras, Geometry, Approximation methods, Rendering (computer graphics), Image segmentation, graphics and multimedia, nonpinhole camera, single-pole occlusion camera, graph camera, depth image, impostor, epipolar constraints, reflection, refraction, relief texture mapping, ambient occlusion, interactive 3D graphics, computer graphics
CITATION
P. Rosen, "Nonpinhole Approximations for Interactive Rendering", IEEE Computer Graphics and Applications, vol.31, no. 6, pp. 68-83, Nov.-Dec. 2011, doi:10.1109/MCG.2011.32
REFERENCES
1. L. Bavoil and M. Sainz, "Image-Space Horizon-Based Ambient Occlusion," Siggraph 2008 Talks, ACM Press, 2008, article 22.
2. C. Mei, V. Popescu, and E. Sacks, "The Occlusion Camera," Computer Graphics Forum, vol. 24, no. 3, 2005, pp. 335–342.
3. V. Popescu, P. Rosen, and N. Adamo-Villani, "The Graph Camera," ACM Trans. Graphics, vol. 28, no. 5, 2009, article 158.
4. C. Wyman, "An Approximate Image-Space Approach for Interactive Refraction," ACM Trans. Graphics, vol. 24, no 3, pp. 1050–1053.
5. Q. Mo, V. Popescu, and C. Wyman, "The Soft Shadow Occlusion Camera," Proc. 15th Pacific Conf. Computer Graphics and Applications (PG 07), IEEE Press, 2007, pp. 189–198.
6. E. Ofek and A. Rappoport, "Interactive Reflections on Curved Objects," Proc. Siggraph, ACM Press, 1998, pp. 333–342.
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