Rendering optimal solar shadows with plural sunlight depth buffers

Tanaka, Katsumi; Qin, Xueying; Jiao, Guofang; Nakamae, Eihachiro

doi:10.1007/pl00013400

Cited by 22 publications

(8 citation statements)

References 9 publications

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“…Adaptive shadow maps also use progressive refinement, which may not work well for scenes with a moving light source. Another approach similar to adaptive shadow maps uses multiple shadow maps of varying resolution [Tadamura et al 2001]. Perspective shadow maps [Stamminger and Drettakis 2002] ameliorate aliasing by warping the depth buffer in order to allocate more samples near the viewer.…”

Section: Image Precision Methodsmentioning

confidence: 99%

Interactive shadow generation in complex environments

et al. 2003

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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.

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Section: Image Precision Methodsmentioning

confidence: 99%

Interactive shadow generation in complex environments

et al. 2003

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“…However, the traversal and refinement operations require many rendering passes and aren't feasible for real-time applications. A GPU-accelerated implementation of ASMs was lately presented by Lefohn et al 13 Partitioning algorithms 9,[14][15][16] improve the shadow quality using multiple shadow maps, but with requiring multiple rendering passes. Like this paper, the paper in Reference [9] also presents an analysis of PRs.…”

Section: Previous Workmentioning

confidence: 99%

Generalized minimum‐norm perspective shadow maps

Zhang

Sun²,

Zhao³

et al. 2008

Computer Animation & Virtual

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Shadow mapping has been extensively used for real-time shadow rendering in 3D computer games, though it suffers from the inherent aliasing problems due to its image-based nature. This paper presents an enhanced variant of light space perspective shadow maps to optimize perspective aliasing distribution in possible general cases where the light and view directions are not orthogonal. To be mathematically sound, the generalized representation of perspective aliasing errors has been derived in detail. Our experiments have shown the enhanced shadow quality using our algorithm in dynamic scenes.

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“…Cascaded shadow map [Tadamura et al 2001] splits the view frustum into multiple frustum with different resolution. Adaptive shadow map [Fernando et al 2001] replaces an entire shadow map texture with a hierarchical representation.…”

Section: Related Workmentioning

confidence: 99%

Adaptive depth bias for shadow maps

Dou

Yan

Kerzner

et al. 2014

Proceedings of the 18th Meeting of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games

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Figure 1: The overview (left) of an interior scene illuminated by traditional shadow mapping and close look (right) to certain areas. Both constant depth bias (first column) and slope scale depth bias (second column) suffer from shadow acne and shadow detachment to different extent. Our method (third column) has no visible acne and preserves more shadow details. Dual depth layers depth bias (fourth column) is used as reference to compare our method against. AbstractShadow aliasing due to limited storage precision has been plaguing discrete shadowing algorithms for decades. We present a simple method to eliminate false self-shadowing through adaptive depth bias. Unlike existing methods which simply set the weight of the bias based on surface slope or utilize the second nearest surface, we evaluate the bound of bias for each fragment and compute the optimal bias within the bound. Our method introduces small overhead, preserves more shadow details than widely used constant bias and slope scale bias and works for common 2D shadow maps as well as 3D binary shadow volumes.

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Rendering optimal solar shadows with plural sunlight depth buffers

Cited by 22 publications

References 9 publications

Interactive shadow generation in complex environments

Interactive shadow generation in complex environments

Generalized minimum‐norm perspective shadow maps

Adaptive depth bias for shadow maps

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