Research On Variable-scale 3D Modeling Technology Based On Point Cloud

Along with the development of social science and technology,3d modeling technology has been widely used in the field of education technology,such as the students learn some difficult to understand the chemical and physical experiment,can use 3d modeling technology to build a virtual laboratory,students can set their own instrument operation and safety of all kinds of experiments,effectively improve the students’interest in learning,to make experimental ability and the quality of the teacher’s teaching,form a flip courses to students as the main body,teacher as auxiliary classroom teaching patterns.When students learn complex spatial structures such as mathematical geometric models,they can use 3D modeling technology to create 3D models in the 3D digital educational resource base to present their complex spatial structures,turn abstraction into concrete,and reduce the difficulty of learning knowledge for students with limited spatial imagination ability.Through 3D modeling technology,virtual laboratory can be built,3D digital teaching resources can be built,educational games can be developed,and cultural relic modeling teaching can be developed.The virtual laboratory built by 3D modeling technology can easily allow students to conduct immersive and situational learning,and provide technical support for the modern new learning mode.In the information age,students need to have the ability to independently search for information and learn.The 3D digital educational resource base built by 3D modeling technology provides a learning environment for students to learn constructivism.3D modeling technology also provides a strong technical support for the development of educational games,so that students can learn knowledge happily in the games.In addition,3D modeling technology can also be used to restore ancient cultural relics and ancient buildings,so that students can feel the long cultural history of the motherland,and cultivate students’sense of cultural confidence and national pride.In short,3D modeling technology,as an important means of education and teaching,promotes the application of technology in education and promotes the development of educational technology.In this thesis,we study the change of dimension 3d modeling technology relies on the information of the scale of the original data,but does not contain a lot of data model scale information,is proposed in this thesis on the basis of predecessors’research scale selection method based on statistical analysis,the mutative scale modeling technology in the absence of the original 3d data of gathering information also has good performance on data.In addition,the NESTE-NET deep learning method proposed in literature was used to calculate the normal direction of data,so as to improve the modeling quality at the details of the object surface.The main work contents of this thesis are as follows:(1)Firstly,data preprocessing is carried out,including data registration,data denoising,data normal vector calculation and scale information preprocessing.This step is the primary and most basic work of modeling.(2)Then,the variable scale 3D modeling technology was used for modeling.The scale information was used for spatial division of the 3D data,and the variation of Gaussian function was used to construct the mathematical expression of the 3D model.(3)Finally,the mathematical model is visualized,and an improved marching cube method is used to extract the surface of the three-dimensional model and complete the entire modeling process.The variable scale 3D modeling technology studied in this thesis can provide important technical means for the construction of virtual teaching environment and important tools for the construction of 3D digital resources.