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Image-Based Lighting
Published in Francesco Banterle, Alessandro Artusi, Kurt Debattista, Alan Chalmers, Advanced High Dynamic Range Imaging, 2017
Francesco Banterle, Alessandro Artusi, Kurt Debattista, Alan Chalmers
Since HDR images may represent the true physical properties of lighting at a given point, they can improve the rendering process. In particular, a series of techniques commonly referred to as image-based lighting (IBL) provide methods of accelerating the rendering computations lit by HDR images. These HDR images are, almost always, obtained by capturing the entire sphere of lighting at a point in a real scene. IBL methods render content by using the captured HDR image as lighting in shading computations, recreating the same physical lighting conditions in the virtual scene as in the real scene. This results in realistic-looking images that have been embraced by the film and games industries.
The Impact of Exterior Surround Detail on Daylighting Simulation Results
Published in LEUKOS, 2022
Reza Sadeghi, Richard Mistrick
To quantify the contribution from each of the 4 external source regions onto the work plane analysis points, we utilized an image-based lighting (IBL) simulation (Inanici 2009). In this approach, the acquired HDR image is projected onto a hemisphere and used as a light source in daylight simulations. IBL has been used for daylight simulation at both window and rooftop apertures (Chiou and Huang 2015; Inanici 2009, 2010). In this study it was assumed that the selected study locations were the window to a small office. The simulated office space dimensions were: width = 3.7 m, length = 4.9 m, Height = 3.0 m (12 x 16 × 10 ft.) with surface reflectances of ceiling = 0.9, wall = 0.6, and floor = 0.2 (Fig. 7). Five points on the work plane (0.76 m/2.5 ft. above the floor) were chosen through the center of the space and the illuminance at each point was computed using an appropriate image mask and the Radiance lighting simulation software (LBNL, 2016).
Design and development of an unmanned aerial vehicle to capture real-world illumination for image-based lighting for dense urban environment
Published in Computer-Aided Design and Applications, 2018
Image-based lighting is a digital technique built and based on the related techniques of environmental mapping and high dynamic range imaging. This technique often uses an omnidirectional image that has been captured in the real-world, which then is projected onto a dome in a virtual scene. When the projected image is a high dynamic range image, which encompasses the captured luminance distribution, the mapped image can provide real-world illumination in a virtual scene. However, the light probe image, which used to be projected onto the dome in a virtual scene, can now be acquired by photographing a mirrored sphere or by using a fish-eye lens [7]. Fig. 1 illustrates the use of HDR photography to generate a light probe image for IBL. This method uses a digital camera fitted with a fish-eye lens on a tripod, capturing multiple exposure digital photos each recording a limited range of luminance data of the skydome. If the captured images cover the entire high dynamic range of real world illumination, the assembled HDR light probe image could be a reliable lighting source representing the sky illumination for IBL [4] [7].
Spatial representations of melanopic light in architecture
Published in Architectural Science Review, 2021
Philippe Lalande, Claude M. H. Demers, Jean-François Lalonde, André Potvin, Marc Hébert
The desire for daylight is affected, among others, by its effect on a space’s appearance, the function of a space and cultural preferences (Veitch, Christoffersen, and Galasiu 2013). Immersive representation accordingly incorporates subjective assessments (Rockcastle, Chamilothori, and Andersen 2017). Because relying on both objective and subjective assessments appraises building performance holistically (Altomonte et al. 2017), architects can gain through this tool a more thorough understanding of daylighting strategies in relation to performance and preferences. Spatial representations, such as experimented through panoramic photography encompassing a 360° field of view, record a visual ambience specific to a time and place. Although the representation remains abstract if represented in two dimensions, it gains a spatial presence through immersive representation. This refers to the possibility of visually feeling in the space, consistent with daylight characteristics at the time of capture. In this specific context, immersive environments provide an intuitive approach to communication, whereas traditional representations require specific architectural representation literacy and knowledge of daylighting dynamics. As they induce perception and cognition, immersive environments allow stakeholders to ‘contribute creatively to the innovation process’ (Plesner and Horst 2012). Immersive representation has proved adequate to represent simulated architectural spaces using HDR renderings (Chamilothori, Wienold, and Andersen 2018), especially when using image-based lighting (Cauwerts and Piderit 2018), as HDRi tone-mapping acknowledges the adaptability of the human eye to the luminous environment.