A lighting model for general participating media

Hegeman, Kyle; Ashikhmin, Michael; Premože, Simon

doi:10.1145/1053427.1053446

Cited by 13 publications

(14 citation statements)

References 22 publications

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“…In addition, [Premoze et al 2004] speed up this technique and account for the spatial spreading of light around this mean path through an analytical formulation. This approach has been brought to real-time [Hegeman et al 2005] using graphics hardware for volume slicing in a manner similar to [Harris and Lastra 2001;Riley et al 2004]. These methods based on two slicing passes (accumulating the flux from the light source in the slices, then from the slices to the eye) restrict the variety of light paths accounted for.…”

Section: Light Transportmentioning

confidence: 99%

Interactive multiple anisotropic scattering in clouds

Bouthors

Neyret

Max

et al. 2008

Proceedings of the 2008 Symposium on Interactive 3D Graphics and Games

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We propose an algorithm for the real time realistic simulation of multiple anisotropic scattering of light in a volume. Contrary to previous real-time methods we account for all kinds of light paths through the medium and preserve their anisotropic behavior.Our approach consists of estimating the energy transport from the illuminated cloud surface to the rendered cloud pixel for each separate order of multiple scattering. We represent the distribution of light paths reaching a given viewed cloud pixel with the mean and standard deviation of their entry points on the lit surface, which we call the collector area. At rendering time for each pixel we determine the collector area on the lit cloud surface for different sets of scattering orders, then we infer the associated light transport. The fast computation of the collector area and light transport is possible thanks to a preliminary analysis of multiple scattering in planeparallel slabs and does not require slicing or marching through the volume.Rendering is done efficiently in a shader on the GPU, relying on a cloud surface mesh augmented with a Hypertexture to enrich the shape and silhouette. We demonstrate our model with the interactive rendering of detailed animated cumulus and cloudy sky at 2-10 frames per second.

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Section: Light Transportmentioning

confidence: 99%

Interactive multiple anisotropic scattering in clouds

Bouthors

Neyret

Max

et al. 2008

Proceedings of the 2008 Symposium on Interactive 3D Graphics and Games

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“…However, our algorithms do not need such a preprocessing step. There are other simplified lighting models for participating media and volumes [13,14,18,26]. For all these methods, only forward scattering is considered and lighting values are propagated from slice to slice.…”

Section: Discussionmentioning

confidence: 99%

“…Max [20] has extended the discrete ordinates method to capture anisotropic multiple scattering. Hegeman et al [14] have proposed a two-pass approach for strong forward scattering. Harris and Lastra [13] have used a similar approach to render clouds.…”

Section: Introductionmentioning

confidence: 99%

Lattice-Based Volumetric Global Illumination

Qiu

Fan

et al. 2007

IEEE Trans. Visual. Comput. Graphics

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Abstract-We describe a novel volumetric global illumination framework based on the Face-Centered Cubic (FCC) lattice. An FCC lattice has important advantages over a Cartesian lattice. It has higher packing density in the frequency domain, which translates to better sampling efficiency. Furthermore, it has the maximal possible kissing number (equivalent to the number of nearest neighbors of each site), which provides optimal 3D angular discretization among all lattices. We employ a new two-pass (illumination and rendering) global illumination scheme on an FCC lattice. This scheme exploits the angular discretization to greatly simplify the computation in multiple scattering and to minimize illumination information storage. The GPU has been utilized to further accelerate the rendering stage. We demonstrate our new framework with participating media and volume rendering with multiple scattering, where both are significantly faster than traditional techniques with comparable quality.

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“…In addition, Premoze [23] speed up this technique and account for the spatial spreading of light around this mean path through an analytical formulation. Hegeman [24] has been brought this approach to real-time using graphics hardware for volume slicing in a manner similar to Harris [25], Riley [26]. Bouthors [27] has extended the study of Neyret [20], he described a phenomenological approach for realize a cumulus clouds model from observations of real scenes.…”

Section: Renderingmentioning

confidence: 99%