There are some errors in the calculation methods of tourism space carrying capacity,which bring about the calculated value is much higher than actual value and cause virtual visitors.

A fast terrain texture generation and virtual wandering method;

Realization of the dynamic interactive 3D virtual wandering system in the rural community based on VRML;

Realization of user-defined motion model in virtual wandering;

Based on the improved triangular prism 3D data model and the intersect arithmetic of assistant line and face with triangular prism and some function of OpenGL, realized several visual operations on 3D geological model including slice up, virtual drilling, virtual roam, translucent slice and translucent drilling, which achieved the aim of information dig from 3D model in a certain extent.

Virtual Roam Technique is an essential branch of Virtual Reality.

Research on Technology of Virtual Walkthrough Based on OpenGL;

3D Virtual Walkthrough System Based on Web Services;

Research and Implementation of Virtual Walkthrough System Based on OpenGL;

The virtual navigation of the complex environment is an important aspect of virtual reality research.

A new fisheye image edge extraction algorithm was proposed based on its round valid area;the overlap area of images to be mosaicked was determinated according to the minimum brightness difference in this area,and thus the fisheye images mosaics were accomplished after images fusion;finally,the virtual navigation was accomplished through color information extraction form fisheye images directly.

A robot virtual navigation(RVN) system is presented based on OpenGL.

Developing virtual tourism!eovironment and its key techniques;

The paper discusses the development and significance of the virtual tourism, generalizes and analyses its research contents and technological key points.