CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

id 2006_566
authors Rafi, Ahmad; Mohamad Izani Zainal Abidin; Avijit Paul and Aishah Abdul Razak
year 2006
title Simulation of architectural lighting in a virtual environment - A case study on real and fake High Dynamic Range Images (HDRI)
source Communicating Space(s) [24th eCAADe Conference Proceedings / ISBN 0-9541183-5-9] Volos (Greece) 6-9 September 2006, pp. 566-572
summary The early findings of this research were presented in eCAADe 2005 International Conference, Lisbon primarily to highlight the concept of High Dynamic Range Images (HDRI) when representing architectural spaces in the form of still images. An experiment had been carried out to compare the results between HDRI rendering and ‘conventional’ lighting simulation algorithms namely ray tracing and radiosity. The results were based on static and using the same exposure factors, when capturing HDRI. This project, funded by Intensification Research Priority Area (IRPA) grant continues to present and report HDRI results in a simulation environment. In this paper, we first briefly explain on the concept of real and fake HDRI. Then a comparison experiment is conducted to compare these two methods and discuss the impact and effectiveness of the illumination computation in architectural simulation environment. In order to carry out the experiment, a few models of the architectural scenes were developed. These models were then textured with real photos and manipulated with ‘shaders’, and further rendered using fake and real HDRI techniques. As for the fake HDRI, two methods were developed. The first was using an image as the ambient map and different exposures were created by increasing the value of Hue, V of HSV and saturation. The second involved a series of digital photos with the selection of the brightest and darkest area using Adobe Photoshop to establish the scale of luminosity. A few camera movements were triggered and position for ‘real-time’ rendering simulation. The result of the experiment has shown a significant improvement on the rendering time and quality of the rendering. Finally this paper suggests the selection criteria for choosing real and fake HDRI, and how each technique can be best utilized for architectural representations in a simulation environment.
keywords HDRI; simulation; Real HDRI;Fake HDRI; illumination computation
series eCAADe
email ahmadrafi.eshaq@mmu.edu.my
full text file.pdf (393,179 bytes)
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100%; open Adel M. (2002) Find in CUMINCAD Evaluating Lightscape’s accuracy for predicting daylighting illuminance compared to an actual space , Master of Interior Design thesis, University of Florida, USA, pp. 1-105
100%; open Besuievsky G. & Pueyo X. (2001) Find in CUMINCAD A Monte Carlo method for accelerating the computation of animated radiosity sequences , Proceedings of Computer Graphics International 2001, pp. 201-208
100%; open Chevrier C. & Perrin J.P. (2003) Find in CUMINCAD Modlum: Illumination project aided design tool , Proceedings of the 10th International Conference on Computer Aided Architectural Design Futures [CAAD Futures 2003]. Tainan, Taiwan, pp. 361-370
100%; open Czerner J. & Gatermann H. (2002) Find in CUMINCAD Modelling and rendering virtual architecture by using fisheye-panorama-based images and lightings in HDR-quality , Proceedings of the 6th Iberoamerican Congress of Digital Graphics [SIGraDI]. Caracas, Venezuela, pp. 172-174
100%; open Debevec P. (1998) Find in CUMINCAD Rendering synthetic objects into real scenes: Bridging traditional and image-based graphics with global illumination and high dynamic range photography , Proceedings of SIGGRAPH 98, Computer Graphics Annual Conference Series, pp. 189-198
100%; open Debevec P.E & Malik J. (1997) Find in CUMINCAD Recovering high dynamic range radiance maps from photographs , Proceedings of ACM SIGGRAPH 97, pp. 369-378
100%; open Havran V., Damez C., Myszkowski K. & Seidel H.P. (2003) Find in CUMINCAD An efficient spatio-temporal architecture for animation rendering , Proceedings of the 14th Eurographics Workshop on Rendering, pp.106 – 117
100%; open Serrato-Combe A. (2004) Find in CUMINCAD Something’s gotta give’ architectural animations , Proceedings of 8th Iberoamerican Congress of Digital Graphics [SIGraDI]. Porte Alegre, Brasil, pp. 257-261

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