A real-time photo-realistic visual flythrough

Cohen–Or, Daniel; Rich, Elaine; Lerner, U.; Shenkar, Victor

doi:10.1109/2945.537308

Cited by 57 publications

(47 citation statements)

References 11 publications

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“…In addition, ray casting of pre-antialised 3D volume terrain and subvoxel sampling in true 3D space performed by our terrain rendering algorithm produce a higher image quality, compared with that reached by other voxel-based terrain rendering methods [7,8].…”

Section: Overview Of the Systemmentioning

confidence: 99%

“…Normally, it is recommended for a reasonable image quality that l be no more than the distance between two adjacent voxels of the volume. In particular, when a terrain dataset is rendered by the ray casting algorithm, there is no explicit intersection calculation, but a sequential search along each ray for the hit position of the ray and the terrain surface [8]. Evidently, both the rendering rate and the image quality of terrain are related to the accuracy of the hit information, which is directly affected by the sampling intervals along each ray.…”

Section: Voxel-based 3d Terrain Modelingmentioning

confidence: 99%

“…More importantly, the voxel-based model is somewhat scene complexity independent, and it is easy to incorporate clouds, haze, flames, and other amorphous phenomena and volumetric objects [4]. Therefore, in recent years, the voxel-based approach has become the new trend for height field visualization systems [5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we are interested in parallelizing a fast volume rendering algorithm that relies on algorithmic optimizations. The most efficient acceleration technique published so far for voxelbased terrain rendering is to incorporate ray coherence into the ray casting algorithm, assuming that the terrain model has no 3D shapes such as overhangs, since the terrain is a height field [7,8]. The basic idea of ray coherence is that, if two rays cast from the viewpoint are projected onto the same line on the base plane of the terrain, the higher ray hits the terrain surface at a position farther away from the viewpoint.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the determination of the intersection between the higher ray and the terrain can be accelerated by starting sampling from the intersection depth of the lower ray rather than from the beginning. In order to decrease the memory of the terrain volume and its accessing time, the original elevation map is often used as 2.5D data [7,8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Virtual flythrough over a voxel-based terrain

Wan

Qu²,

Kaufman

Proceedings IEEE Virtual Reality (Cat. No. 99CB36316)

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Section: Overview Of the Systemmentioning

confidence: 99%

Section: Voxel-based 3d Terrain Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Virtual flythrough over a voxel-based terrain

Wan

Qu²,

Kaufman

Proceedings IEEE Virtual Reality (Cat. No. 99CB36316)

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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.

show abstract

A Terrain Rendering Method Using Vertical Ray Coherence

Lee

Shin

1997

J. Visual. Comput. Animat.

View full text Add to dashboard Cite

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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A real-time photo-realistic visual flythrough

Cited by 57 publications

References 11 publications

Virtual flythrough over a voxel-based terrain

Virtual flythrough over a voxel-based terrain

A Terrain Rendering Method Using Vertical Ray Coherence

A Terrain Rendering Method Using Vertical Ray Coherence

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