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This paper presents an algorithm to approximate a solid model by a hierarchical set of bounding ellipsoids having optimal shape and volume approximation errors. The ellipsoid-tree is constructed in a top-down splitting framework. Starting from the root of hierarchy the volume occupied by a given model is divided into k sub-volumes where each is approximated by a volume bounding ellipsoid and will...
In the past, several approaches have been proposed to produce high quality solid textures. Unfortunately, they often suffer from several synthesis artifacts, such as color blurry, bad texture structures, introducing aberrant voxel colors and so on. In this paper, we present a novel algorithm for synthesizing high quality solid textures from 2D exemplars. We adopt an optimization framework with the...
In this paper, we present a 3D geometric constraint solver for direct manipulation of B-rep model. First, we discuss the representation of 3D geometric elements and geometric constraints. Then, we propose two abstract dual objects to encapsulate diverse geometric elements based on the decoupled property analysis of constraint configuration. Subsequently, we introduce a modified directed graph method...
Sectional views are widely used in engineering practice due to their clear and concise expression. However, large numbers of entities are missing in sectional views that makes it hard for computer to understand drawings. Feature identification is the key procedure for solids reconstruction from sectional views. Based on the analysis of the default drawing rules appearing in sectional views, a new...
In order to make the semantic information of feature be shared and understood by computer, this paper discusses and analysis the semantic information of features, presents a semantic concept of feature. Based on description logic representations for semantic concepts of features and hierarchy structures are given. Based on the description logical reasoning of concept, a solution to realize automatic...
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