Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Portsmouth, Jamie"'
We introduce the "Energy-preserving Oren--Nayar" (EON) model for reflection from rough surfaces. Unlike the popular qualitative Oren--Nayar model (QON) and its variants, our model is energy-preserving via analytical energy compensation. We include se
Externí odkaz:
http://arxiv.org/abs/2410.18026
Rendering highly scattering participating media using brute force path tracing is a challenge. The diffusion approximation reduces the problem to solving a simple linear partial differential equation. Flux-limited diffusion introduces non-linearities
Externí odkaz:
http://arxiv.org/abs/1807.00410
Autor:
Portsmouth, Jamie
We present an easy-to-implement and efficient analytical inversion algorithm for the unbiased random sampling of a set of points on a triangle mesh whose surface density is specified by barycentric interpolation of non-negative per-vertex weights. Th
Externí odkaz:
http://arxiv.org/abs/1708.07559
For the rendering of multiple scattering effects in participating media, methods based on the diffusion approximation are an extremely efficient alternative to Monte Carlo path tracing. However, in sufficiently transparent regions, classical diffusio
Externí odkaz:
http://arxiv.org/abs/1403.8105
Autor:
Portsmouth, Jamie, 1974
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.
Includes bibliographical references (p. 121-125).
This electronic version was submitted by the student author. The certified thesis is available in the Institut
Includes bibliographical references (p. 121-125).
This electronic version was submitted by the student author. The certified thesis is available in the Institut
Externí odkaz:
http://hdl.handle.net/1721.1/17016
We apply the coherency tensor formalism to the calculation of the spectral distortions imprinted in the intensity and polarization of the cosmic microwave background radiation due to the kinematic and thermal Sunyaev-Zeldovich effects (SZE). We obtai
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412095
A novel covariant formalism for the treatment of the transfer and Compton scattering of partially polarized light is presented. This was initially developed to aid in the computation of relativistic corrections to the polarization generated by the Su
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412094
Autor:
Portsmouth, Jamie
Publikováno v:
Phys.Rev.D70:063504,2004
Part of the CMB polarization signal in the direction of galaxy clusters is produced by Thomson scattering of the CMB temperature quadrupole. In principle this allows measurement of the CMB power spectrum harmonic $C_2(z)$ with higher accuracy (at $z>
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402173
Rendering highly scattering participating media using brute force path tracing is a challenge. The diffusion approximation reduces the problem to solving a simple linear partial differential equation. Flux-limited diffusion introduces nonlinearities
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fd096558478921def3934d2e6266062