| Engineering practice plays a vital role in environmental engineering education.The limited time and space in engineering practice,as well as lacking of interest,lead to the unsatis-factory on-site education effectiveness.In order to solve these problems and help students learning the environmental engineering equipment,structures,and pipelines,this study applied virtual reality(VR)technology to the environmental engineering practice education.It developed two sets of VR software for exhausted gas deodorization system and coal chemical industry wastewater treatment system.Meanwhile,it optimized the design of software in various ways.Comparing with previous VR software development process,the conception of VR software performance optimization was added in the development process in this work.A workflow including Cinema 4D modeling,RizomUV processing model UV,Quixel Mixer making textures,and Unreal Engine 4 was formed for developing VR software.Meanwhile,it puts forward performance optimization methods and regulations of the development process.According to the above-mentioned development process,the VR teaching software of a exhausted gas biological deodorization system for wastewater treatment plant and a coal chemical industry wastewater treatment system has been completed.The exhausted gas deodorization system demonstrates the entire process of exhausted gas collection,transportation,treatment,and discharge.The VR system could fully present the internal and external structure of the double-stage biotrickling filter tower,and provide a media for learning the biotrickling filter deodorization process.The coal chemical industry wastewater treatment system demonstrates the core biological treatment and physical-chemical treatment processes in the coal chemical industry wastewater treatment process and provides students with support for learning the treatment process and design points.The two sets of VR software scenes are huge.In order to optimize the software and improve their teaching effectiveness,this research starts from the three aspects of software logic,culling method,and rendering pipeline.By using various performance optimization methods such as frustum culling,instanced model and material,programming logic optimization,etc,it can use single level to demonstrate all structures and avoid the problems of incoherent learning and systemic weakening caused by scene segmentation.As for software functions,this research sets up pipeline highlighting,flow direction display,current location guidance,scene screen control,and other interactions according to the different characteristics of the project and students’ learning difficulties,other than traditional interactive contents such as full-level roaming,process control,equipment,and structure display.It solves the difficulty in understanding pipelines in real life during a field trip and the difficulty in identifying structures in large scenes.It also meets the needs of free adjustment of scenes and provides students with clearer learning guidance and various learning methods.In addition to the realization described previously,the article also explores the panoramic video production method based on Unreal Engine 4 and Premiere and the particle movement constraint and simulation in the complex structure based on Niagara.This is the first time to apply VR technology to the case video production and project development process,it provided a foundation and reference for follow-up researchers.In order to further improve the teaching effect,the thesis designed a questionnaire to investigate the application effect of the exhausted gas deodorization VR system in the undergraduate practical education of environmental engineering.The survey results showed that the VR software can effectively improve the enthusiasm of students and improve the efficiency of students’ knowledge acquisition,and encourage students to form self-education and self-learning habits. |
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