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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Using neural networks to generate realistic skies
 Hojdar, Štěpán ; Křivánek, Jaroslav (advisor) ; Šikudová, Elena (referee)
Environment maps are widely used in several computer graphics fields, such as realistic architectural rendering or computer games as sources of the light in the scene. Obtaining these maps is not easy, since they have to have both a high- dynamic range as well as a high resolution. As a result, they are expensive to make and the supply is limited. Deep neural networks are a widely unexplored research area and have been successfully used for generating complex and realistic images like human portraits. Neural networks perform well at predicting data from complex models, which are easily observable, such as photos of the real world. This thesis explores the idea of generating physically plausible environment maps by utilizing deep neural networks known as generative adversarial networks. Since a skydome dataset is not publicly available, we develop a scalable capture process with both low-end and high-end hardware. We implement a pipeline to process the captured data before feeding it to a network and extend an already existing network architecture to generate HDR environment maps. We then run a series of experiments to determine the quality of the results and uncover the directions of possible further research.
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Procedural placement of 3D objects
 Hojdar, Štěpán ; Křivánek, Jaroslav (advisor) ; Kahoun, Martin (referee)
3D modelling in computer graphics often requires placing a big number of objects into the scene. This may be tedious or even impossible if done manually. A few programs exist to perform this task automatically but most of them are either too slow to place the required number of objects or too difficult to use for a non-expert user. We expand the already existing Corona Scatter program which is fast and user friendly but lacks in terms of functionality. We implement scattering regular patterns, scattering along spline objects and the ability to use spline objects to locally modify the distribution properties.
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