2) Material recovery under complex illumination conditionsGenerally speaking, it is very difficult to model the lighting of an object in a complexenvironment with ageneral lighting model due to the effect of indirect illuminations.
It expounds the 3D modeling method of the visual entity, and puts forward light model method and the theory of 2D/3D model obtaining retrieval, and transformation that the mathematic model can be established based on polygon grid.
In this paper, we study how to develop a computer aided design system for fabric appearance simulation on the basis of data obtained from CCD optical system. This CAD system is based on establishing fabric appearance simulation model in the computer and fabric structure model, studying the fabric structure's impact on fabric appearance simulation, establishing a light model used for the gray treatment and treating with yarn's twist.
This paper discuss the key technologies of Virtual Manufacture, including the method and theory of the displaying of the 3D scene, polygonal mesh model, visual light model, collision checking, 3D geometry transform and the particle system.