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From Graphics to Visualization
Published in Alexandru Telea, Data Visualization, 2014
In practice, several rendering equations are used, which can approximate lighting effects to various degrees of realism. Two known approximations are the radiosity methods, which are good at producing soft shadows [Foley et al. 95, Sillion 94], and ray-tracing methods, which are good at simulating shiny surfaces, mirror-like reflections, and precise shadows [Foley et al. 95, Shirley and Morley 03]. However, both radiosity and ray-tracing methods are relatively expensive to compute, even for simple 3D scenes. The reason behind this is that the rendering equations used by such methods relate the illumination of a given point to the illumination of several, potentially many, other points in the scene. For this reason, such methods are also called global illumination methods. Hence, solving for the complete scene illumination amounts to solving a complex system of per-point rendering equations.
Achieving realtime daylight factor computation for modular buildings in generative design
Published in Journal of Building Performance Simulation, 2022
The fundamental concepts underlying most physical calculations are well known. There are essentially four methods for simulating the spatial distribution of diffuse illuminance in a room (Marsh and Stravoravdis 2017): split-flux, radiosity, ray-tracing and photon mapping methods, the first being the least computationally expensive. In the BS community, daylighting simulation and global illumination computation is usually performed using directly or indirectly the Radiance suite, a robust simulation engine widely experienced by practitioners and researchers, and implemented in a large pannel of tools based on ray tracing (IES, DAYSIM, DIVA for Rhino, ClimateStudio, late Ecotect, …).