In recent years, 3D sketching has gained popularity as an efficient alternative to conventional 3D geometric modeling for rapid prototyping, as it allows the user to intuitively generate a large range of different shapes. In this paper, we present some sketching interactions for 3D modeling, based on a set of two different bidimensional sketches (profile curve and silhouette curve). By using th...

VR systems are important for many applications such as education and entertainment. In this paper, we design a method to construct intelligent characters in virtual environments based on group characteristics. Every character is encapsulated as an agent model; a combination of the geometric model describing characters’ spatial characteristics, and the behavioral model with a reasoning function....

With the use of geometric constraints, parametric and variational solid modeling systems enable designers to incorporate relationships between geometric entities into the geometric model and thereby control potential changes in geometry. The objective of developing these constraints or relations is to capture the intent of the designer and restrict changes that may be made by other users of the...

We present a method to automatically estimate the motion of an articulated object filmed by two or more fixed cameras. We focus our work on the case where the quality of the images is poor, and where only an approximation of a geometric model of the tracked object is available. Our technique uses physical forces applied to each rigid part of a kinematic 3D model of the object we are tracking. T...

The conventional wisdom expressed at several recent joint conferences and workshops on algebraic geometry and geometric modeling – Algebraic Geometry and Geometric Modeling 2002, Vilnius, Lithuania, The MSRI Workshop on Real Algebraic Geometry in Applications, Berkeley, 2004, and Algebraic Geometry and Geometric Modeling 2004, Nice, France – is that algebraic geometry has much to offer geometri...

In recent years, there has been a growing interest in computer graphics and geometric modeling in the ability to create and manipulate Seemingly Impossible Models (SIMs). Methods to create derivative work and modify drawings and paintings of SIMs made by artists were suggested. Similarly, 3D realization of SIMs of some of these drawings were also offered. In this work, we further explore the na...

from geometric modeling to shape modeling ifip tc5 wg5 2 seventh workshop on geometric modeling fundamentals and applications october 2 4 2000 parma italy. Book lovers, when you need a new book to read, find the book here. Never worry not to find what you need. Is the from geometric modeling to shape modeling ifip tc5 wg5 2 seventh workshop on geometric modeling fundamentals and applications oc...

This paper presents a sketch based mesh extrusion method, which is useful for intuitive, efficient geometric modeling of freeform polygonal objects. With our method, the user can extrude either a closed or open surface from the surface or the boundary of a given mesh by sketched input. Thus, compared to earlier methods, our method provides more flexibility for solving surface modeling problems....

Normally, academic applications of computer-aided design in construction provide a visual presentation of the final state of the project and they are not able to produce changes in the geometry following the construction process. It was developed a didactic prototype that allows physical changes in a building component. This prototype illustrates the construction of a common external wall. Firs...

Based on Spatial structure of the roadway, threedimensional geometric modeling of the roadway has been studied.It is separately gived that a detailed analysis of roadway centerline modeling, roadway cross-section modeling, roadway intersection modeling and an efficient data structure. Using VC++ and openGL, a specific test was carried out.This paper introduces a relevant algorithm in which the ...