Hardware-accelerated rendering of antialiased shadows with shadow maps

Brabec, Stefan; Seidel, Hans‐Peter

doi:10.1109/cgi.2001.934676

Cited by 12 publications

(15 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In computer graphics, many techniques have been proposed to render antialiased images [Pharr and Humphreys 2004;Akeninemöller et al 2008], antialiased textures [Reeves et al 1987;Brabec and Seidel 2001] and antialiased shadows [Cant and Shrubsole 2000;Jon et al 2000]. However, only a few works focus on recovering smooth, antialiased edges from aliased 2D images.…”

Section: Antialiasing Recoverymentioning

confidence: 98%

Antialiasing recovery for edit propagation

2011

Proceedings of the 10th International Conference on Virtual Reality Continuum and Its Applications in Industry

View full text Add to dashboard Cite

a) original image (b) result of Xu et al. (c) our result Figure 1: An example of edit propagation. (a) shows the original image and user strokes. (b) and (c) show the propagation results using the method by [Xu et al. 2009a] and our method, respectively. Alias artifacts are visible in (b) along the boundary of the building. Our method successfully eliminate these artifacts, as shown in (c). AbstractEdit propagation on images/videos has become more and more popular in recent years due to simple and intuitive interaction. It propagates sparse user edits to the whole data following the policy that nearby regions with similar appearances receive similar edits. While it gives a friendly editing mode, it often produces aliasing artifacts on edge pixels. In this paper, we present a simple algorithm to resolve this artifact for edit propagation. The key in our method is a new representation called Antialias Map, in which we represent each antialiased edge pixel by a linear interpolation of neighboring pixels around the edge, and instead of considering the original edge pixels in solving edit propagation, we consider those neighboring pixels. We demonstrate that our work is effective in preserving antialiased edges for edit propagation and could be easily integrated with existing edit propagation methods such as [Xu et al. 2009a].

show abstract

Section: Antialiasing Recoverymentioning

confidence: 98%

Antialiasing recovery for edit propagation

2011

Proceedings of the 10th International Conference on Virtual Reality Continuum and Its Applications in Industry

View full text Add to dashboard Cite

show abstract

“…In some situations the blurring may be excessive or even undesirable. Brabec et al [2001] applied this filtering for hardware-based shadow map rendering. Fernando et al [2001] presented adaptive shadow maps which are used to increase the effective shadow map resolution in areas where edge aliasing occurs.…”

Section: Image Precision Methodsmentioning

confidence: 99%

Interactive shadow generation in complex environments

et al. 2003

View full text Add to dashboard Cite

Figure 1: The left image shows a snapshot generated from the application of our hybrid shadow generation algorithm to the powerplant model (12.7M triangles). The middle image shows a different viewpoint generated using perspective shadow maps. Notice the aliasing artifacts. The right image highlights the shadows generated by our interactive algorithm from the same viewpoint with sharper boundaries. Abstract:We present a new algorithm for interactive generation of hard-edged, umbral shadows in complex environments with a moving light source. Our algorithm is based on a hybrid approach that combines some of the efficiencies of image-precision techniques along with the image quality of object-precision methods. We present interactive algorithms based on levels-of-detail (LODs) and visibility culling to compute the potential shadow-casters and shadow-receivers. We further reduce their size based on a novel cross-visibility culling algorithm. Finally, we use a combination of shadow polygons and shadow maps to generate shadows. We also present techniques for LOD-selection that eliminate the artifacts in self-shadows. Our algorithm can generate sharp shadow edges and reduce aliasing. We have implemented the algorithm on a three PC system with NVIDIA GeForce-4 cards and applied it to three complex environments composed of millions of triangles. It can render the scene and generate shadows at 7 − 25 frames per second on these models.

show abstract

“…On the other hand, the discrete nature of images leads to aliasing. Percentage closer ltering [25,8,28]. uses several shadow map samples to smooth the jaggy boundary of hard shadows.…”

Section: Previous Workmentioning

confidence: 99%

Plausible Image Based Soft Shadows Using Occlusion Textures

Eisemann¹,

Décoret²

2006

2006 19th Brazilian Symposium on Computer Graphics and Image Processing

View full text Add to dashboard Cite

This paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources. The algorithm's performance is mostly independent of the scene complexity and the source's size. Occluders and receivers do not need to be separated and no knowledge about the scene representation is required, making the method easy to use. The main idea is to approximate the occlusion in the scene with preltered occlusion textures. The visibility of the light source at a point in space is estimated by accumulating the occlusion caused by each texture, using a novel formula based on probabilities.

show abstract

Hardware-accelerated rendering of antialiased shadows with shadow maps

Cited by 12 publications

References 7 publications

Antialiasing recovery for edit propagation

Antialiasing recovery for edit propagation

Interactive shadow generation in complex environments

Plausible Image Based Soft Shadows Using Occlusion Textures

Contact Info

Product

Resources

About