High-Quality Shadows with Improved Paraboloid Mapping

Vanek, J.; Navrátil, Jan; Herout, Adam; Zemčík, Pavel

doi:10.1007/978-3-642-24028-7_39

Cited by 2 publications

(2 citation statements)

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“…For this reason, dual paraboloid mapping remains an important option to the implementation of rendering algorithms. For instance, [BAS02] and [VNHZ11] directly render their shadow information to DPMs to utilize the map generation speed advantage. When we render 3D models to DPMs, the 3D models are required to be reasonably tessellated.…”

Section: Dual Paraboloid Mappingmentioning

confidence: 99%

“…When we render 3D models to DPMs, the 3D models are required to be reasonably tessellated. For the sparsely tessellated 3D models, we may use the GPU tessellation unit to avoid the artifacts [VNHZ11]. Mentioned also in [BAS02], alpha testing is required besides depth testing to include only the contents that belong to the hemisphere being rendered.…”

Section: Dual Paraboloid Mappingmentioning

confidence: 99%

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Seamless Mipmap Filtering for Dual Paraboloid Maps

Wang

Leung

et al. 2019

Computer Graphics Forum

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Dual paraboloid mapping is an approach for environment mapping. Its major advantage is its fast map generation speed. For graphics applications, when filtering is needed, the filtering tool would naturally be mipmapping. However, directly applying mipmapping to dual paraboloid mapping would give us three problems. They are the discontinuity across the dual paraboloid map boundary, the non‐uniform sampling problem and the depth testing issue. We propose three approaches to solve these problems. Our approaches are based on some closed form equations derived via theoretical analysis. Using these equations, we modify the coordinates involved during the rendering process. In other words, these problems are handled just by using dual paraboloid maps and mipmaps differently, instead of fundamentally altering their data structures. Consequently, we are fixing the problems without damaging the map generation speed advantage. Applying all three approaches, we improve the rendering quality of dual paraboloid map mipmaps to a level equivalent to that of cubemap mipmaps, while preserving its fast map generation speed advantage. This gives dual paraboloid map mipmaps the potential to be a better choice than cubemap mipmaps for the devices with less computational power. The effectiveness and the efficiency of the proposed approaches are demonstrated using a glossy reflection application and an omnidirectional soft shadow generation application.

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Section: Dual Paraboloid Mappingmentioning

confidence: 99%

Section: Dual Paraboloid Mappingmentioning

confidence: 99%