Technical Section A simple normal enhancement technique for interactive non-photorealistic renderings (original) (raw)

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Normal enhancement for interactive non-photorealistic rendering

2002

Abstract We present a simple technique to improve the perception of shape of an object. Bump mapping is well-known in the computer graphics community for providing the impression of small-scale geometrical features (which actually are not there). Here, we propose a similar approach (variation of normals) for the purpose of enhancing perception of the given geometry. Our approach is based on a simple modification of the surface normals in order to enhance the geometric features of the object during the rendering.

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Towards a set of techniques to implement Bump Mapping

2003

The revolution of three dimensional video gameslead to an intense development of graphical techniquesand hardware. Texture-mapping hardware is now able togenerate interactive computer-generated imagery withhigh levels of per-pixel detail. Nevertheless, traditionalsingle texture techniques are not able to simulate bumpedsurfaces decently. More traditional bump mappingtechniques, such as Emboss bump mapping, most timesdeploy an undesirable or ‘fake’ appearance to wrinkles insurfaces. Bump mapping can be applied to different typesof applications varying form computer games, 3denvironment simulations, and architectural projects,among others. In this paper we will examine a method thatcan be applied in 3d game engines, which uses texturemapsto generate bump surfaces in a flat polygon, calledDot3 bump mapping. This method is based on normalperturbationtechnique and a vectorial operationperformed at each pixel which results on a correct lightcalculation, and therefore great visual quality....

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Technical Section A simple normal enhancement technique for interactive non-photorealistic renderings (original) (raw)

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