A pyramid-based approach to interactive terrain visualization

Kaba, J.; Peters, J.

doi:10.1109/prs.1993.586088

Cited by 4 publications

(8 citation statements)

References 10 publications

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“…Several implementations of orthographic and perspective terrain rendering have been previously reported [2,3,4,7,9,10,11]. Similar to polygon rendering and volume rendering [8], terrain rendering can be solved by ray tracing (ray casting) [3,11], feed forward [2,7], or 1-D shearing [4,9,10].…”

Section: Previous Workmentioning

confidence: 99%

“…Similar to polygon rendering and volume rendering [8], terrain rendering can be solved by ray tracing (ray casting) [3,11], feed forward [2,7], or 1-D shearing [4,9,10]. Stanfill [11] implemented a ray-casting algorithm to generate perspective views.…”

Section: Previous Workmentioning

confidence: 99%

“…Robertson [10] proposed a scan-line algorithm that applies a series of 1D shearing transformations in orthogonal spatial directions to achieve 3-D spatial image transformation and fast hidden-surface removal. Robertson's algorithm has been implemented on a massively parallel distributed memory SIMD computer, the Princeton Engine, by Kaba and Peters [4]. The 1-D shearing rendering can not be applied to the spherical data model directly.…”

Section: Previous Workmentioning

confidence: 99%

“…OQ= oP + PQ= 3f~ + 2hr + ~a2 +2ar (4) where r is the radius of the zero-elevation sphere, a is the maximal elevation of the data above the sphere and h is the distance between the viewpoint and the zero elevation surface. For each tile, the distance is computed from the viewpoint to the central pixel of the tile with an elevation the average of the highest and the lowest pixels in the tile.…”

Section: Data Decompositionmentioning

confidence: 99%

“…Data pyramiding is an image scaling technique that has been used in terrain rendering to reduce computation and eliminate aliasing problems [4,11]. For a large input dataset with hundreds or even thousands of mega-pixels, it is important to be able to view the data at different levels of detail, from a perspective that overlooks the entire dataset down to a small area for a close look of the terrain.…”

Section: Data Pyramidingmentioning

confidence: 99%

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Remote interactive visualization and analysis (RIVA) using parallel supercomputers

Duquette

Curkendall

1995

Proceedings of the IEEE Symposium on Parallel Rendering - PRS '95

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JPL's Remote Interactive Visualization and Analysis System (RIVA) is described in detail. RIVA's kernel is a highly scalable perspective renderer tailored especially for the demands of large datasets beyond the sensible reach of workstations. The algorithmic details of this renderer are described, particularly the aspects key to achieving the algorithm's overall scalability. The paper summarizes the performance achieved for machine sizes up to more than 500 nodes and for initial input image/terrain bases of up to a gigabyte.The RIVA system integrates workstation graphics, massively parallel computing technology, and gigabit communication networks to provide a flexible interactive environment for scientific data perusal, analysis and visualization. Early experience with using RIVA to interactively explore multivariate datasets is reported and some example results given.

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Section: Previous Workmentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

Section: Data Decompositionmentioning

confidence: 99%

Section: Data Pyramidingmentioning

confidence: 99%

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Remote interactive visualization and analysis (RIVA) using parallel supercomputers

Duquette

Curkendall

1995

Proceedings of the IEEE Symposium on Parallel Rendering - PRS '95

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A Terrain Rendering Method Using Vertical Ray Coherence

Lee

Shin

1997

J. Visual. Comput. Animat.

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Ray casting may be applied to the terrain rendering from DTMs (digital terrain models). In this paper we propose a ray casting method which exploits exact vertical ray coherence. This method not only achieves a good performance, but also allows any set of viewing parameters. To analyse the vertical ray coherence property, we define the following terms: a ray plane which is perpendicular to the sea-level plane and passes through the COP (centre of projection), and the corresponding ray line which is the line of intersection of the ray plane and the projection plane. Vertical ray coherence can be stated as: if two rays pass through the same ray line, they pass over the identical set of points on the DTM base plane. After a ray is cast on the DTM, we can get a good starting point to cast another ray using this property.Our method tries to cover the projection plane with ray lines. Since ray lines are not parallel to each other, it is a difficult task to cover the entire plane. In fact all ray lines intersect at a point (COP′). We first generate a set of ray lines sufficient to cover the projection plane near COP′. As pixels get further from COP′, more ray lines are generated to fill most of the gaps between pixels covered by the previous set of ray lines. Rays passing through the same ray line are effectively cast using vertical ray coherence. To fill remaining pixels not covered by ray lines, pixel values of vertical/horizontal neighbours are interpolated. To cast rays efficiently, successive points generated by a line algorithm are followed along the projection of the rays on the DTM base plane. © 1997 by John Wiley & Sons, Ltd. key words: terrain rendering; digital terrain models; visualization; ray casting; vertical ray coherence; perspective projection An effective way of accelerating the ray casting process is proposed in Reference 5, which adopted a hierarchical data structure. A data structure that facilitates space

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RIVA: a versatile parallel rendering system for interactive scientific visualization

Duquette

Curkendall

1996

IEEE Trans. Visual. Comput. Graphics

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A pyramid-based approach to interactive terrain visualization

Cited by 4 publications

References 10 publications

Remote interactive visualization and analysis (RIVA) using parallel supercomputers

Remote interactive visualization and analysis (RIVA) using parallel supercomputers

A Terrain Rendering Method Using Vertical Ray Coherence

RIVA: a versatile parallel rendering system for interactive scientific visualization

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