What is the way to obtain radiance environment maps?

One method to obtain radiance environment maps is to take photographs in the desired environment of a physical sphere whose surface BRDF matches that of the target object.

What is the way to model a BRDF?

If the BRDF is a perfect mirror and the warp models it as a perfect mirror, the authors need only sample well enough to catch the highest frequencies in the environment.

How many pre-computed radiance maps are used?

Using a custom offline ray tracer the authors directly solve the lighting integral for each point in twelve pre-computed radiance environment maps.

What are the limitations of a radiance environment map?

Since all surface points that have a common normal use the same reflected radiance, only the lighting contribution from a distant environment can be captured, not reflections of local objects or inter-reflections of a single surface.

How does Debevec use the lighting equation to allow interactive rendering?

The authors build upon the work of Debevec by pre-integrating the lighting equation to allow interactive rendering – in part by constraining the geometry of the global radiance environment maps.

How do the authors create new maps for new viewpoints?

The authors dynamically create new maps for new viewpoints by combining the precomputed maps using an application of IBR techniques in reflection space.

How has the IBR technique been used to improve the rendering of complex objects?

this has been accomplished by vastly simplifying the approximations used in the shading and lighting equations – resulting in a significant loss in complexity and quality.

Open AccessProceedings Article10.1145/311535.311553

Reflection space image based rendering

Brian Cabral, +2 more

- 01 Jul 1999

- pp 165-170

222

TL;DR: The present invention provides a method, system, and computer program product for reflection space image based rendering of an object at an interactive frame rate for destination radiance environment map creation.

Abstract: The present invention provides a method, system, and computer program product for reflection space image based rendering of an object at an interactive frame rate. A set of source radiance environment maps associated with a set of source viewing vectors are warped to create a destination radiance environment map associated with a destination viewing vector in a current frame. Blending and weighting operations can also be applied in creating the final destination radiance environment map. An object is then rendered with texture environment mapped from the destination radiance environment map.

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Most frequently asked questions

1. What have the authors contributed in "Reflection space image based rendering" ?

Cabral et al. this paper proposed a reflection space IBR algorithm on radiance environment maps, which allows interactive rendering of arbitrary objects with a large class of complex BRDFs.

2. What have the authors stated for future works in "Reflection space image based rendering" ?

Some areas of future work to improve this technique are apparent.. The authors would also like to extend the range of BRDFs that can be accurately rendered.. A broader area of future research is opened by the idea of reflection-space IBR.

3. What is the way to reconstruct a map?

The authors use reflection-space IBR to reconstruct the map for rendering from the maps, but the authors still require reasonable coverage of the sphere of possible view directions to avoid aliasing artifacts.

4. How many spherical triangles are used to form?

Each vertex, of this spherical triangle is the view vector for one of the source images that have been warped to match " . % is used to form three interior spherical triangles.

Figure 1: A radiance environment sphere map, , is defined on the image plane shown on the left. Each point in is associated with a normal, , and a reflection vector, . The normal specifies the hemisphere, over which is defined.

Figure 2: Illustrated is the spherical patch defined by , and associated with a particular point of view given by . By definition defines in the line of sight of the viewer and in general forms three spherical triangles within the larger spherical triangle patch. Areas and represent the three weights for the sphere maps associated with vertices , and respectively, where and are the dihedral angles used to compute .

Citations

Proceedings Article•10.1145/566570.566612

Precomputed radiance transfer for real-time rendering in dynamic, low-frequency lighting environments

Peter-Pike Sloan, +2 more

- 01 Jul 2002

TL;DR: A new, real-time method for rendering diffuse and glossy objects in low-frequency lighting environments that captures soft shadows, interreflections, and caustics and introduces functions for radiance transfer from a dynamic lighting environment through a preprocessed object to neighboring points in space.

...read moreread less

1.1K

Proceedings Article•10.1145/383259.383317

An efficient representation for irradiance environment maps

Ravi Ramamoorthi, +1 more

- 01 Aug 2001

TL;DR: A simple and efficient procedural rendering algorithm amenable to hardware implementation, a prefiltering method up to three orders of magnitude faster than previous techniques, and new representations for lighting design and image-based rendering are considered.

...read moreread less

Proceedings Article•10.1145/344779.344925

Surface light fields for 3D photography

Daniel N. Wood, +6 more

- 01 Jul 2000

TL;DR: This paper presents a framework for construction, compression, interactive rendering, and rudimentary editing of surface light fields of real objects, incorporating view-dependent geometric level-of-detail control.

...read moreread less

596

Journal Article•10.1145/566654.566612

Precomputed radiance transfer for real-time rendering in dynamic, low-frequency lighting environments

SloanPeter-Pike, +2 more

- 01 Jul 2002

- ACM Transactions on Graphics

TL;DR: In this article, a real-time method for rendering diffuse and glossy objects in low-frequency lighting environments that captures soft shadows, interreflections, and caustics is presented.

...read moreread less

397

Journal Article•10.1109/TPAMI.2004.88

Modeling the space of camera response functions

Michael Grossberg, +1 more

- 01 Oct 2004

- IEEE Transactions on Pattern Analysis an...

TL;DR: This work combines the constraints from the theoretical space with the data from the DoRF database to create a low-parameter empirical model of response (EMoR), which allows us to accurately interpolate the complete response function of a camera from a small number of measurements obtained using a standard chart.

...read moreread less

363

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References

Proceedings Article•10.1145/237170.237199

Light field rendering

Marc Levoy, +1 more

- 01 Aug 1996

TL;DR: This paper describes a sampled representation for light fields that allows for both efficient creation and display of inward and outward looking views, and describes a compression system that is able to compress the light fields generated by more than a factor of 100:1 with very little loss of fidelity.

...read moreread less

4.9K

•Book

Curves and surfaces for computer aided geometric design

Gerald Farin

- 28 May 1990

3.8K

•Proceedings Article•10.1145/237170.237200

The lumigraph

Steven J. Gortler, +3 more

- 01 Aug 1996

TL;DR: A new method for capturing the complete appearance of both synthetic and real world objects and scenes, representing this information, and then using this representation to render images of the object from new camera positions.

...read moreread less

3.3K

Proceedings Article•10.1145/1401132.1401174

Recovering high dynamic range radiance maps from photographs

Paul Debevec, +1 more

- 03 Aug 1997

TL;DR: This work discusses how this work is applicable in many areas of computer graphics involving digitized photographs, including image-based modeling, image compositing, and image processing, and demonstrates a few applications of having high dynamic range radiance maps.

...read moreread less

3.2K

Journal Article•10.1145/15886.15902

The rendering equation

James T. Kajiya

- 31 Aug 1986

TL;DR: An integral equation is presented which generalizes a variety of known rendering algorithms and a new form of variance reduction, called Hierarchical sampling, which may be an efficient new technique for a wide variety of monte carlo procedures.

...read moreread less

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Reflection space image based rendering

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Most frequently asked questions

1. What have the authors contributed in "Reflection space image based rendering" ?

2. What have the authors stated for future works in "Reflection space image based rendering" ?

3. What is the way to reconstruct a map?

4. How many spherical triangles are used to form?

5. What is the way to obtain radiance environment maps?

6. What is the way to model a BRDF?

7. How many pre-computed radiance maps are used?

8. What are the limitations of a radiance environment map?

9. How does Debevec use the lighting equation to allow interactive rendering?

10. How do the authors create new maps for new viewpoints?

11. How has the IBR technique been used to improve the rendering of complex objects?

Figures

Citations

Precomputed radiance transfer for real-time rendering in dynamic, low-frequency lighting environments

An efficient representation for irradiance environment maps

Surface light fields for 3D photography

Precomputed radiance transfer for real-time rendering in dynamic, low-frequency lighting environments

Modeling the space of camera response functions

References

Light field rendering

Curves and surfaces for computer aided geometric design

The lumigraph

Recovering high dynamic range radiance maps from photographs

The rendering equation

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