Fast shadows and lighting effects using texture mapping

Segal, Madhav N.; Korobkin, Carl Phillip; Widenfelt, Rolf van; Foran, Jim; Haeberli, Paul

doi:10.1145/133994.134071

Cited by 200 publications

(77 citation statements)

References 10 publications

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“…For directional lights, the read cache is initialized with a constant color based on the color and intensity of the light. For point and spot lights, the read cache is generated by projecting the light with projective texture mapping [25] towards a plane where the propagation will start, before spreading out the color contribution. Thus, both point and spot light can be treated the same way during propagation, and we do not need to perform any specific operation for the first propagation step.…”

Section: Technical Realizationmentioning

confidence: 99%

Efficient volume illumination with multiple light sources through selective light updates

Sundén

Ropinski

2015

2015 IEEE Pacific Visualization Symposium (PacificVis)

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Figure 1: A CT scan of a mummy (438 × 289 × 1700 voxels) rendered using the proposed volumetric illumination method. To enable high contrast in bright and shadowed areas, we use a light setup that consists of two warm (orange and red) point lights and two directional white lights. ABSTRACTIncorporating volumetric illumination into rendering of volumetric data increases visual realism, which can lead to improved spatial comprehension. It is known that spatial comprehension can be further improved by incorporating multiple light sources. However, many volumetric illumination algorithms have severe drawbacks when dealing with multiple light sources. These drawbacks are mainly high performance penalties and memory usage, which can be tackled with specialized data structures or data under sampling. In contrast, in this paper we present a method which enables volumetric illumination with multiple light sources without requiring precomputation or impacting visual quality. To achieve this goal, we introduce selective light updates which minimize the required computations when light settings are changed. We will discuss and analyze the novel concepts underlying selective light updates, and demonstrate them when applied to real-world data under different light settings.

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Section: Technical Realizationmentioning

confidence: 99%

Efficient volume illumination with multiple light sources through selective light updates

Sundén

Ropinski

2015

2015 IEEE Pacific Visualization Symposium (PacificVis)

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“…The predicted images can be computed very efficiently thanks to graphics card hardware-accelerated rasterizing capabilities. In our implementation, we determine the visibility of surface points in all cameras using OpenGL depth buffering, we compute the reprojection of an image to another camera via the surface using projective texture mapping, and we discard semioccluded areas using shadow-mapping (Segal et al, 1992). The bottleneck in our current implementation is the computation of the similarity measure.…”

Section: Implementation Issuesmentioning

confidence: 99%

Multi-View Stereo Reconstruction and Scene Flow Estimation with a Global Image-Based Matching Score

Pons¹,

Keriven²,

Faugeras

2006

Int J Comput Vision

263

215

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We present a new variational method for multi-view stereovision and non-rigid three-dimensional motion estimation from multiple video sequences. Our method minimizes the prediction error of the shape and motion estimates. Both problems then translate into a generic image registration task. The latter is entrusted to a global measure of image similarity, chosen depending on imaging conditions and scene properties. Rather than integrating a matching measure computed independently at each surface point, our approach computes a global image-based matching score between the input images and the predicted images. The matching process fully handles projective distortion and partial occlusions. Neighborhood as well as global intensity information can be exploited to improve the robustness to appearance changes due to non-Lambertian materials and illumination changes, without any approximation of shape, motion or visibility. Moreover, our approach results in a simpler, more flexible, and more efficient implementation than in existing methods. The computation time on large datasets does not exceed thirty minutes on a standard workstation. Finally, our method is compliant with a hardware implementation with graphics processor units. Our stereovision algorithm yields very good results on a variety of datasets including specularities and translucency. We have successfully tested our motion estimation algorithm on a very challenging multi-view video sequence of a non-rigid scene.

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“…For point blocks, we make use of the shadow mapping technique [20]. First, a virtual camera is placed at the position of the sun and points in the point blocks are rendered by using a point rendering technique [18].…”

Section: Rendering Shadows Of Cloudsmentioning

confidence: 99%

An interactive rendering system using hierarchical data structure for earth-scale clouds

Dobashi

Yamamoto

Nishita

2010

Sci. China Inf. Sci.

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This paper presents an interactive system for realistic visualization of earth-scale clouds. Realistic images can be generated at interactive frame rates while the viewpoint and the sunlight directions can be changed interactively. The realistic display of earth-scale clouds requires us to render large volume data representing the density distribution of the clouds. However, this is generally time-consuming and it is difficult to achieve the interactive performance, especially when the sunlight direction can be changed. To address this, our system precomputes the integrated intensities and opacities of clouds for various viewing and sunlight directions. This idea is combined with a novel hierarchical data structure for further acceleration. The photorealism of the final image is improved by taking into account the atmospheric effects and shadows of clouds on the earth. We demonstrate the usefulness of our system by an application to a space flight simulation. CitationDobashi Y, Yamamoto T, Nishita T. An interactive rendering system using hierarchical data structure for earth-scale clouds. Sci China Inf Sci, 2010, 53: 920-931,

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Fast shadows and lighting effects using texture mapping

Cited by 200 publications

References 10 publications

Efficient volume illumination with multiple light sources through selective light updates

Efficient volume illumination with multiple light sources through selective light updates

Multi-View Stereo Reconstruction and Scene Flow Estimation with a Global Image-Based Matching Score

An interactive rendering system using hierarchical data structure for earth-scale clouds

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