Abstract
Daylight redirecting components (DRCs) are characterised by complex transmissive and reflective behaviour that is difficult to predict accurately largely due to their highly directional scattering, and the caustics this produces. This paper examines the application of progressive photon mapping as a state of the art forward raytracing technique to efficiently simulate the behaviour of such DRCs, and how this approach can support architects in assessing their performance.Progressive photon mapping is an iterative variant of static photon mapping that effects noise reduction through accumulation of results, as well as a reduction in bias inherent to all density estimation methods by reducing the associated bandwidth at a predetermined rate. This not only results in simplified parametrisation for the user, but also provides a preview of the progressively refined simulation, thus making the tool accessible to non-experts as well.We demonstrate the effectiveness of this technique with an implementation based on the Radiancephoton mapping extension and a case study involving retroreflecting prismatic blinds as a representative DRC.
Highlights
The accurate simulation of daylight redirecting components (DRCs) is essential in assessing their performance and predicting their energy saving potential through daylight autonomy
We demonstrate the effectiveness of this technique with an implementation based on the RADIANCE photon mapping extension and a case study involving retroreflecting prismatic blinds as a representative DRC
Raytracing techniques have proven to be expedient in this application as they accurately model the light transport within the components and how it propagates in a typical office environment
Summary
The accurate simulation of daylight redirecting components (DRCs) is essential in assessing their performance and predicting their energy saving potential through daylight autonomy. Raytracing techniques have proven to be expedient in this application as they accurately model the light transport within the components (assuming an accurate representation of material properties) and how it propagates in a typical office environment. Photon mapping (Jensen, 2001) is a forward raytracing technique which supplements a standard backward raytracer, resulting in bidirectional light transport. R. Schregle et al / Solar Energy 114 (2015) 327–336 rendering system originally developed by the author (Schregle, 2004). Schregle et al / Solar Energy 114 (2015) 327–336 rendering system originally developed by the author (Schregle, 2004) It extends the RADIANCE backward raytracing core (Ward, 1994) with a forward raytracer for bidirectional light transport as described above. The standard photon mapping approach has since been superseded by recent developments in the computer graphics community; progressive photon mapping is the state of the art forward raytracing approach, which overcomes a number of issues with the original implementation that improve its usability for non-experts, notably in the context of daylight simulation
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