A Physically-Based Model for Rendering Realistic Scratches

Individually visible scratches, also called isolated scratches, are very common in real world surfaces. Although their microgeometry is not visible, they are individually perceptible by the human eye, lying into a representation scale between BRDF and texture. In order to simulate this kind of scratches in synthetic images we need to know their position over the surface (texture scale), so we can determine where to use the specific scratch BRDF instead of the ordinary surface BRDF. Computing the BRDF of a scratch is difficult because it depends on the scratch's invisible microgeometry. In this paper, we propose a new physically based model to derive this microgeometry by simulating the formation process of scratches. We allow specifying intuitively the parameters involved in the process such as the scratching tool, the penetration forces, and the material properties of the object. From these parameters, we derive the microgeometries of the scratches by taking into account the rea...

• Type: Journal
• Year: 2004
• Where: CGF
• Authors: Carles Bosch, Xavier Pueyo, Stéphane Mérillou, Djamchid Ghazanfarpour
• Keywords: CGF 2004, Ordinary Surface Brdf, Specific Scratch Brdf, Visible Scratches