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Article Dans Une Revue The Visual Computer Année : 2001

Surface scratches : Measuring, Modeling and Rendering

Résumé

One of the most important criticisms that can be made concerning synthesized images is the brand new and too clean aspect of objects. Surface color modifica- tions can be used to introduce dirtiness or other aging- linked characteristics. Also, techniques such as bump or displacement mapping allow users to improve sur- face aspects by introducing geometrical perturbations. In parallel, the bidirectional reflectance distribution function (BRDF) is a crucial factor in achieving a high degree of realism. It turns out that surfaces are very often covered by defects such as scratches that are re- lated to both textures and BRDFs due to their size. Scratches do not always affect the apparent geometry but nevertheless can remain strongly visible. None of the previously mentioned methods is suited for ren- dering these defects efficiently. We propose a new method, based on extensions to existing BRDFs and classical 2D texture mapping techniques, to render efficiently individually visible scratches. We use phys- ical measurements on "real objects" to derive an ac- curate geometric model of scratches at small scale range (roughness scale), and we introduce a new ge- ometric level between bump mapping and BRDFs. Beyond providing graphical results closely matching real cases, our method opens the way to a new class of considerations in computer graphics based on defects that require the coupling of both BRDFs and texturing techniques.
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Dates et versions

hal-01026545 , version 1 (21-07-2014)

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  • HAL Id : hal-01026545 , version 1

Citer

Stéphane Mérillou, Jean-Michel Dischler, Djamchid Ghazanfarpour. Surface scratches : Measuring, Modeling and Rendering. The Visual Computer, 2001, 17, pp.30-45. ⟨hal-01026545⟩

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