High Dynamic Range (HDR) imaging using a fisheye lens has provided new opportunities to evaluate the luminous environment in visual comfort research. For glare analysis, strict calibration is necessary to extract accurate luminous maps to achieve reliable glare results. Most studies have focused on correcting the vignetting effect in HDR imaging during post-calibration. However, the lens projection also contributes to luminous map errors because of its inherent distortion. To date, there is no simple method to correct this distortion phenomenon for glare analysis. This paper presents a parametric-based methodology to correct the projection distortion from fisheye lenses for the specific use in glare analysis. HDR images were captured to examine two devices: a 190° equisolid SIGMA 8 mm F3.5 EX DG fisheye lens mounted on a Canon 5D camera, and a 195° fisheye commercial lens with an unknown projection, mounted on the rear camera of a Samsung Galaxy S7. A mathematical and geometrical model was developed to remap each pixel to correct the projection distortion using Grasshopper and MATLAB. The parametric-based method was validated using Radiance and MATLAB through checking the accuracy of pixel remapping and measuring color distortion with Structural Similarity Index (SSIM). Glare scores were used to compare the results between both devices, which validates the use of mobile phones in photometric research. The results showed that this method can be used to correct HDR images projection distortion for more accurate evaluation of the luminous environment in glare research.

The potentials of integrating thin-film photovoltaic technology into buildings make it the recommended renewable energy source not only for traditional architectures, but also the most innovative applications that favour envelopes characterized by free morphologies such as membrane structures. The integration of Photovoltaic technology into membrane structures offers a promising significant step in the market development. However, some challenges and questions are arising relating to the applicability of such systems and how they are significantly dependant on a list of complex aspects that have to be taken into account during the design phase. These aspects include the wide variety of membrane three-dimensional geometries that in turn govern the modules distribution, orientation and shadowing as well as the distribution of stresses and deflections for each single project and how both the structure and modules react to them.\ud \ud The interference between the aforementioned aspects makes it hardly investigated without using a parametric tool that's able to analyze multiple parameters in an integrative real time process. Therefore, a parametric Photovoltaic model using Grasshopper was developed as a part of the PhD dissertation of the first author, Ibrahim H., With the target to analyze the aspects that impact the payback time of the PV system such as the layout orientation, the effect of shadowing and the maximum deflection allowed for the membrane surface under different loading conditions concluding with calculating the total clear surface area available for allocating PV modules. This paper presents how Grasshopper parametric tool can be efficiently used for analysing and evaluating the feasibility of applying flexible PV systems on tensile structures geometries. The outcomes of this research work will be applied to the structures designed and manufactured by Inside2Outside Ltd within the research activities founded by Innovate UK during the 30 month Knowledge Transfer Partnership KTP9912