Characterizing phonon dynamics using stochastic sampling

2016 ◽  
Vol 119 (11) ◽  
pp. 115101
Author(s):  
K. Kunal ◽  
N. R. Aluru
Keyword(s):  
Stochastic Sampling ◽  
Phonon Dynamics

Real-time subsurface scattering with single pass variance-guided adaptive importance sampling

2020 ◽  
Vol 3 (1) ◽  
pp. 1-21
Author(s):  
Tiantian Xie ◽  
Marc Olano ◽  
Brian Karis ◽  
Krzysztof Narkowicz
Keyword(s):  
Real Time ◽  
Adaptive Sampling ◽  
Monte Carlo Sampling ◽  
Diffusion Profile ◽  
Correct Result ◽  
Subsurface Scattering ◽  
Stochastic Sampling ◽  
Light Gradient ◽  
Temporal Variance ◽  
Importance Function

In real-time applications, it is difficult to simulate realistic subsurface scattering with differing degrees translucency. Burley's reflectance approximation by empirically fitting the diffusion profile as a whole makes it possible to achieve realistic looking subsurface scattering for different translucent materials in screen space. However, achieving a physically correct result requires real-time Monte Carlo sampling of the analytic importance function per pixel per frame, which seems prohibitive to achieve. In this paper, we propose an approximation of the importance function that can be evaluated in real-time. Since subsurface scattering is more pronounced in certain regions (e.g., with light gradient change), we propose an adaptive sampling method based on temporal variance to lower the required number of samples. We propose a one phase adaptive sampling pass that is unbiased, and able to adapt to scene changes due to motion and lighting. To further improve the quality, we explore temporal reuse with a guiding pass prior to the final temporal anti-aliasing (TAA) phase that further improves the quality. Our local guiding pass does not constrain the TAA implementation, and only requires one additional texture to be passed between frames. Our proposed variance-guided algorithm has the potential to make stochastic sampling algorithm effective for real-time rendering.

Nonequilibrium phonon dynamics and electron distribution functions in InP and InAs

1996 ◽  
Vol 53 (15) ◽  
pp. 9847-9851 ◽  
Author(s):  
E. D. Grann ◽  
K. T. Tsen ◽  
D. K. Ferry
Keyword(s):  
Electron Distribution ◽  
Distribution Functions ◽  
Phonon Dynamics

scholarly journals On nonlinear coherent states properties for electron-phonon dynamics

2014 ◽  
Vol 21 (1) ◽  
pp. 89-119
Author(s):  
Isiaka Aremua ◽  
Mahouton Norbert Hounkonnou ◽  
Ezinvi Baloïtcha
Keyword(s):  
Coherent States ◽  
Phonon Dynamics

Temperature dependence of the phonon dynamics of CD4 in plastic phase

1988 ◽  
Vol 10 (8) ◽  
pp. 989-998
Author(s):  
R. K. Singh ◽  
N. V. K. Prabhakar
Keyword(s):  
Temperature Dependence ◽  
Phonon Dynamics ◽  
Plastic Phase
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