Spindulių trasavimas ir padalijimo paviršiai yra svarbūs įrankiai realistiškai atrodantiems vaizdams generuoti. Padalijimas – tai algoritmas, leidžiantis gauti glotnius paviršius pakartotinai dalijant gardeles. Spindulių trasavimas yra technologija, kuri remiasi apšvietimo skaičiavimu. Jos dėka galima gauti atspindžius, permatomumą, spindulių lūžimą kertant skaidrius objektus, taipogi realistiškus šešėlius. Mūsų darbo tikslas buvo suderinti šiuos du metodus, kuriant programinę priemonę, kuri leistų gauti sudėtingų objektų idealiai glotnius aukštos kokybės realistiškus vaizdus. Siekdami to, mes pritaikėme ir tokias kompiuterinės grafikos technologijas, kaip dengimas tekstūromis ir tūrių algebra. / Ray tracing and subdivision surfaces are important tools for generating realistic looking images. Subdivision is an algorithmic technique to generate smooth surfaces as a sequence of successively refined polyhedral meshes. Ray tracing is a technique that performs global calculations of lighting and shading, reflection and transmission of light, casting of shadows, and other effects. The basic idea behind ray tracing is to follow the paths of light rays around a 3-D scene. Our goal is generation of a high-quality realistic images by combining these two techniques. We also implemented other computer graphics methods designed to increase image realism (Texture Mapping) and to simplify modeling process (Boolean operations with solids).

Wood is a limited natural resource whose characteristics have been difficult to identify by advanced technology. The most expensive is a hardwood. There is a desire to optimize the production of wood products by minimizing waste and maximizing output. It could be achieved if one had capabilities to evaluate the common wood structures ― knots, rots, empty spaces and other defects. There are many nondestructive testing methods that could be applied to the evaluation of the inner quality of a log. The most successful one is an x-ray computerized tomography. This thesis covers principles of computerized tomography and image reconstruction algorithms. Testing was performed on implementations of tomographic image reconstruction algorithms using synthetic and real data. Research on an application of an x-ray computerized tomography for the analysis of wood structures was made. Inspection of glued zones in glued wooden articles was accomplished using tomographic imaging. Guidelines for the creation of a wood specialized x-ray computerized tomograph were given.