Design of Virtual Simulation Training System Hong Ai1,a,*, Luyuan He1,b

1 Department of Automation, Harbin University of Science and Technology, No.52 Xuefu Road, Harbin, China

a aihong@hrbust.edu.cn, b 1979429151@qq.com *Corresponding author

Keywords: Virtual reality, Simulation, Unity 3D, c #, 3d Max.

Abstract. Virtual training is a modern experimental teaching method in recent years. It pays attention to interactive and experimental results of experimental simulation operation. Based on Unity 3D, it designed a virtual simulation training system for measuring laser wavelengths by Michelson interferometer. Virtual simulation experiment is used to explore

the basic principles and methods of operation. Try to use 3DMax software to design laboratory and laboratory equipment model. Through Unity3D software builds the experimental environment and operation of the logical relationship test algorithm. Use program to achieve shader optical visualization. It can enhance the practice of students’ practical ability to reflect the new generation of experimental teaching of the open and comprehensive features.

1. Introduction

The virtual simulation training system simulates the development of 3D digital content based on the specific subject content and simulates the training environment with 3D virtual environment or 3D stereoscopic display device so that teachers and students can obtain the same or similar training experience in real world. It is a new type of teaching model and the market is broad[1]. In order to meet needs in the Internet education, this paper studies the virtual simulation system of 3D simulation based on the background of laser measurement. It shows the multi-information fusion interactive three-dimensional dynamic scene, to a certain extent, reflects the VR education intuitive and immersive[2].

2. Unity3D engine

Unity3D is a Danish company launched for a game development, three-dimensional simulation, and cross-platform development of the three-dimensional engine. The Unity3D editor runs on Windows and Mac. It is a game product and software based on Android, Windows, Wii, OSX and iOS platform released, as shown in Figure 1. Unity engine achieves a multi-platform publishing and information exchange[3]. The development environment of Unity3D is friendly and visual. It supports the c # scripting language and the model created by 3dsMax[4-5]. In this article, unity engine model rendering technology is used for different materials and different attributes of the

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The 5th International Conference on Advanced Computer Science Applications and Technologies (ACSAT 2017)

Published by CSP © 2017 the Authors

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5.1 Analysis of concentric circle fringe algorithm

Assume that the distance from the lens to the receiving screen A is M, when the incident angle is z. Radius of interference ring r:

rcos z M/ √r M (3)

The corresponding Δ is indicated by the convergence of the light beam 1 and the light beam 2 on the receiving screen. The phase difference can be written as:

∅ 4πd λ⁄ ∗ M ∅ (4)

The light intensity of the light beam 1 and the light beam 2 to the receiving screen A is I ', and the light intensity I after the polymerization is show in formula(5):

I 4I ∗ ∅ (5)

Concentric ring fringe law: when the fringes generated in the focal plane A, the corresponding experimental phenomenon will have a circle of concentric rings, each concentric ring corresponds to a radius r, and corresponds to an angle of incidence z. And each incident angle z corresponds to Δ and ∅.

5.2 concentric circles drawn

As for the formula(5), determining the constant distance M and d in the mixed light intensity I for the adjustment of the experimental variables, selecting the different values of the interference experiment, making use of shader programming to simulate the real light. And the light color, the shading effect is displayed in the form of an image in the computer. Define a method to deal with stripes to draw concentric circles by c#.

Striped color design: (1) Mixed light intensity I quantized between 0-1, stripes and color values rg b corresponding. (2) Making use of colour processing color function to distinguish between different radius

concentric fringe colours. (3) As shown in Figure 8, after the stripes are drawn, the setting d is adjustable by means of the

Michelson interferometer's coarse adjustment knob and the fine adjustment knob to rotate the angle to show the change of d on the Michelson interferometer.

6. Set up virtual training environment

Different wavelengths corresponding to different visible light, as shown in Figure 9, c# programming assign the corresponding material ball to the light to achieve different wavelengths of choice and measurement, encapsulated it into a separate class assigning to the 3D virtual instrument model. In this way, the model has the performance of the corresponding optical instruments.

58

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