Smooth Penumbra Transitions with Shadow Maps

Boer, Willem H. de

doi:10.1080/2151237x.2006.10129221

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…The most important methods for generating soft shadows based on the shadow map method are given in the following references [7][8][9][10][11][12]. All of these methods are based on detecting edges in order to create a penumbra.…”

Section: Related Workmentioning

confidence: 99%

Applying the Real Time Shadowing Method for Creating Soft Shadows in Opengl

Avdić

Rančić

2018

FU Aut Cont Rob

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This paper presents a technique for rapidly generating and rendering of soft shadows on the scene. The method has the advantage of real-time creating of shadows which look more realistic than hard shadows and have high quality, also it has not high demands in resources. The main idea is to replace a complex light source with a collection of multiple point sources of light in order to decrease rendering time. The mathematic model, experiments, and comparison with similar techniques are given and described.

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Section: Related Workmentioning

confidence: 99%

Applying the Real Time Shadowing Method for Creating Soft Shadows in Opengl

Avdić

Rančić

2018

FU Aut Cont Rob

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“…This algorithm is not efficient, because of the increased layers of the semitransparent. Willem searched the silhouette of blockers seen from the position of light in image space De Boer [8]. After that, the silhouette is launched into skirts.…”

Section: Related Workmentioning

confidence: 99%

Soft bilateral filtering shadows using multiple image-based algorithms

Ali

Kolivand

Sunar

2016

Multimed Tools Appl

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“…Willem detect the silhouette of occluders seen from the center of light source in image space [8]. Then the silhouette is extruded into so-called Skirts.…”

Section: Related Workmentioning

confidence: 99%

“…If p's penumbra information is not null and p is in the inner penumbra region, just rendering p using shadow map and penumbra map is not competent to render the scene [8]. Consider point Q in figure 5, using the rendering method mentioned above, Q is regard as in the inner penumbra region, while Q is actually in the umbra region, the rendering result is wrong (Figure 6).…”

Section: A Algorithm Overviewmentioning

confidence: 99%

Real-Time approximate soft shadow rendering with bidirectional penumbra map

Wang

Jingchao

Shen

2010

2010 International Conference on Educational and Information Technology

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The present traditional penumbra map method can only render the outer part of the penumbra, which breaks down when the umbra region significantly decreases because of the large light sources and the large distance between the occluder and the shadowed objects. This happens for very large area light source or as the occluder moves away from the objects it shadows. This paper proposes a real-time soft shadow rendering method based on bidirectional penumbra map generated in image space. It first extracts the edge of the shadow in the shadow map without rendering the whole scenes again. Then it extends the edges both inside and outside to obtain the inner and outer penumbra region, and calculate the change of lighting intensity along the two directions to generate the bidirectional penumbra map. Lastly, the final image is rendered with this penumbra map and the shadow map. This method solves the distortion problem of the traditional penumbra map method when the umbra region significantly decreases. It has only two rendering passes and approximates the soft shadow in image space, thus can be design to run entirely on GPU. The result of our experiments shows the efficiency of our approach.

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Smooth Penumbra Transitions with Shadow Maps

Cited by 8 publications

References 8 publications

Applying the Real Time Shadowing Method for Creating Soft Shadows in Opengl

Applying the Real Time Shadowing Method for Creating Soft Shadows in Opengl

Soft bilateral filtering shadows using multiple image-based algorithms

Real-Time approximate soft shadow rendering with bidirectional penumbra map

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