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research article

Efficient Simulation for Visual Comfort Evaluations

Wasilewski, Stephen
•
Grobe, Lars O.
•
Wienold, Jan  
Show more
2022
Energy and Buildings

This paper provides a validation of a novel sampling, storage, and evaluation method named raytraverse that can quickly and accurately compute glare and visual comfort metrics including vertical illuminance, Daylight Glare Probability (DGP), and Unified Glare Probability (UGP). The motivation is to provide a path towards understanding the spatial and temporal distribution of daylight conditions in an architectural space. Current spatial temporal simulation workflows are constrained by the trade-offs between simulation time, accuracy, generality, and storage requirements. Raytraverse provides a bridge between illuminance sensor calculations, which are fast to calculate but provide limited information, and high-resolution image generation, which provide more information but have long simulation times. To make this bridging possible, it relies on a pair of strategies that yields both high accuracy and high information data. First, an iteratively guided sampling approach based on the discrete wavelet transformation greatly reduces the number of view rays submitted to the renderer. Second, rather than collecting returned values in a raster image or dense matrix, a spatial data structure is used to both sparsely store and re-weight the samples according to their effective solid angle, allowing for the direct integration of any view based lighting metric and the synthesis of interpretable high dynamic range images (HDRi). These strategies can be coupled with existing rendering and climate based daylight modeling (CBDM) methods. Through a comparison with high-quality reference simulations and a best practice CBDM method based on Radiance, the raytraverse methods are shown to significantly reduce the simulation time needed to accurately simulate saturation, contrast, and combined visual comfort metrics for a complete set of annual hourly sky conditions from a range of locations within an office floor plan. The stored simulation data can be quickly re-analyzed for different view directions, metrics or images, and sky conditions.

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Type
research article
DOI
10.1016/j.enbuild.2022.112141
Author(s)
Wasilewski, Stephen
Grobe, Lars O.
Wienold, Jan  
Andersen, Marilyne  
Date Issued

2022

Published in
Energy and Buildings
Volume

267

Article Number

112141

Subjects

Daylight

•

Visual comfort

•

Glare

•

Climate based daylight modeling

•

Rendering

•

Lightfield

•

Validation

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIPID  
FunderGrant Number

Swiss federal funding

179067

RelationURL/DOI

IsSupplementedBy

https://doi.org/10.5281/zenodo.6322619

IsSupplementedBy

https://doi.org/10.5281/zenodo.6322418

IsSupplementedBy

https://doi.org/10.5281/zenodo.6500114
Available on Infoscience
May 17, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/187898
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