The Research Of Key Techniques Of Three-dimensional Panoramic Digital Exhibition Based On WebGL

Online exhibition hall is the first choice to solve the problems like high cost,complex preparation,high maintenance and other issues of real exhibition hall.And more and more museum chose it as a method for preheating exhibition.As the digital trend of exhibition,domestic and international academic field has conducted a series of studies on online exhibition.But most of them assume that the museum entities already exist.And most of them cannot meet the demand of exhibition because of having follow problems: visual gap in switching scene operation,need install the plugin,unable to change/replace,lack of sense of reality.This article in view of the problems of the present digital exhibition,combined with the HTML5 and JavaScript language and chose the new open source efficient 3d rendering engine Three.js as the development platform.The research focus on construction and the interaction experience of 3d panoramic digital exhibition.This paper systematically analyzes a series of methods of online panoramic exhibition hall.And finally,we completed a 3d panoramic digital exhibition platform based on WebGL.In this paper,the main work was as follows:Firstly,we used LOD technology to splitting panorama and generated hierarchy blocks.If we naturally splice the blocks,it will produce obvious gap.Aiming at this problem,we put forward a kind of boundary integration method to balance color transition.Secondly,we designed and implemented a method of panoramic roaming automatic generation function making digital exhibition of sustainable maintenance easier.It includes two methods: accurate viewpoints selection for top view rendering and regional obstacle judgment based on vertex.Thirdly,completed panoramic scenes have modification requirements such as replacing exhibition contents or adding models in to the scene.For this,we put forward a kind of patch type semi-automatic panoramic roaming local modification method.And we proposed the image matching for finding modify location method.Fourthly,we studied and implement the seamlessly connecting videos to panoramas method.And proposed matching video with the panoramic image method,calculation of the rotation angle of connecting video to the panoramic algorithm.These methods make the panoramic roaming switching more fluent.At the last,in the aspect of panoramic image loading,this article uses the ray intersection judgment method and block loading processing method to load panoramic image.It make three-dimensional panoramic digital interactive exhibition platform more smoothly.