Ansatte – Københavns Universitet

Photon differential splatting for rendering caustics

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Jeppe Revall Frisvad, Lars Schjøth, Kenny Erleben, Jon Sporring

We present a photon splatting technique which reduces noise and blur in the rendering of caustics. Blurring of illumination edges is an inherent problem in photon splatting, as each photon is unaware of its neighbours when being splatted. This means that the splat size is usually based on heuristics rather than knowledge of the local flux density. We use photon differentials to determine the size and shape of the splats such that we achieve adaptive anisotropic flux density estimation in photon splatting. As compared to previous work that uses photon differentials, we present the first method where no photons or beams or differentials need to be stored in a map. We also present improvements in the theory of photon differentials, which give more accurate results and a faster implementation. Our technique has good potential for GPU acceleration, and we limit the number of parameters requiring user adjustment to an overall smoothing parameter and the number of photons to be traced.
OriginalsprogEngelsk
TidsskriftComputer Graphics Forum
Vol/bind33
Tidsskriftsnummer6
Sider (fra-til)252-263
Antal sider12
ISSN0167-7055
DOI
StatusUdgivet - 2014

    Forskningsområder

  • density estimation, ray differentials, particle tracing, photon mapping, photon splatting, Computer Graphics [Computing Methodologies]: Rendering

ID: 109420370