Image-based extrusion with realistic surface wrinkles

Per-pixel extrusion mapping is an image-based modeling and rendering technique that can be used in a large variety of computer graphic applications. This technique makes it possible to create geometries without polygonal meshes by extrusion of a basic form stored in a 2D binary image. It is available in four versions: basic extrusion, outward extrusion, beveled extrusion, and chamfered extrusion, and all allow the production of satisfactory results in terms of interactivity or visual quality. The problem is that the extruded surfaces do not exhibit microrelief effects and have a lack of realistic superficial wrinkles. To solve this problem, we proposed in this paper a combination of the per-pixel extrusion mapping and the bump mapping in order to add a microrelief effect to extruded surfaces without changing the basic geometry. For the real-time synchronization between the depth scaling of the microreliefs and the resulting shading, we proposed to use a scale factor to further disturb the normal in a function of depths.

Bump mapping effect application analysing

Bump mapping is an easy way to create the effect of the relief surface that allows a more detailed surface than a polygonal surface does. If there are bumps in surface, you can see light and dark place on surface. Flat surfaces reflect more light and bumpy surfaces reflect less. This effect is used in bump technology. OpenGL, WebGL and DirectX supports this bump technology. This realization is not difficult and is working fast. This is an implementation in pixel or fragment shader.