Physically-based rendering in Computer Graphics requires the knowledge of material properties other than 3D shapes, textures and colors, in order to solve the rendering equation. A number of material models have been developed, since no model is currently able to reproduce the full range of available materials. Although only few material models have been widely adopted in current rendering systems, the lack of standardisation causes several issues in the 3D modelling workflow, leading to a heavy tool dependency of material appearance. In industry, final decisions about products are often based on a virtual prototype, a crucial step for the production pipeline, usually developed by a collaborations among several departments, which exchange data. Unfortunately, exchanged data often tends to differ from the original, when imported into a different application. As a result, delivering consistent visual results requires time, labour and computational cost. This thesis begins with an examination of the current state of the art in material appearance representation and capture, in order to identify a suitable strategy to tackle material appearance consistency. Automatic solutions to this problem are suggested in this work, accounting for the constraints of real-world scenarios, where the only available information is a reference rendering and the renderer used to obtain it, with no access to the implementation of the shaders. In particular, two image-based frameworks are proposed, working under these constraints. The first one, validated by means of perceptual studies, is aimed to the remapping of BRDF parameters and useful when the parameters used for the reference rendering are available. The second one provides consistent material appearance across different renderers, even when the parameters used for the reference are unknown. It allows the selection of an arbitrary reference rendering tool, and manipulates the output of other renderers in order to be consistent with the reference.

I många organisationer runt om i världen växer behovet av att hantera och strukturera information. Med hjälp av ett systemstöd är detta möjligt, i vilket dokumentation om processer på ett företag kan hanteras. Med risker i fokus, är syftet med den här studien att få en djupare förståelse för hur produktions- och materialhanteringsprocesser i ett företag kan struktureras samt att ta fram underlag till dagens produktions- och anskaffningsförfarande. Studien genomförs som en fallstudie där dokumentationen på fallföretaget ska ökas genom en tidsstudie, ABC-klassificering samt en diskussion kring risker med Kraljics matris som utgångspunkt. Resultatet visar på kortare produktionstider, att ett fåtal moduler och artiklar är kostnadsbärande i produktionen samt att dagens arbetssätt medför stora risker. Som ett koncept för att öka dokumentation, sammankoppla processer på företaget och eliminera dessa risker lyfter författarna Training Within Industry, vilket avslutar rapporten. / In many organizations around the world, the need to manage and structure information is a growing factor. This is possible with a system support, in which documentation of processes within a company can be handled. With potential risks in focus, the purpose of this study is to gain a deeper understanding of how production and material management processes in a company can be structured and to develop a foundation for today's production and procurement processes. The study is a case study in which the documentation at the company is to be increased through a time study, ABC-classification and a discussion of risks with Kraljic's matrix as a base. The result shows shorter production times, that few modules and articles are cost-bearing in production and that today's working methods cause major risks. As a concept for increasing documentation, linking processes at the company and eliminating these risks, the authors recommend Training Within Industry, which concludes the report.