Research And Implementation On 3D Infrared Scene Simulation Based On Path Tracing

Infrared imaging is widely used in both civil and military fields.To test an infrared imaging system and other functions that it carries,infrared simulation technology is often needed,and its fidelity directly affects the reliability of the test.Therefore,ray tracing is often used as a rendering framework in 3D scene simulation.Path tracing is an implementation of the ray tracing framework.Using Monte Carlo method to randomly track multiple rays,and calculates the color value of the point according to the contribution of these rays.It takes advantage of the unbiasedness and consistency of the Monte Carlo method to generate photorealistic images.Most renderers are also built on path tracing algorithms.Infrared simulation system based on path tracking can display more scene details,and make it more photorealistic.Focusing on the basic theories of infrared radiation transmission and path tracing,the Monte Carlo method used to calculate the rendering equation of visible light in path tracing is also applied to the radiation integration.An infrared radiation transmission calculation model highly integrated into the path tracing framework with zero sight distance is obtained.The infrared rendering result obtained through iterative calculation will have higher fidelity.The path tracking algorithm is considered computationally expensive,but it can be fully parallelized,so OpenGL shaders are used to transform its original rendering pipeline,adapt it to the path tracking algorithm.Using the powerful parallel computing capabilities of GPUs,rendering time is greatly shortened while obtaining photorealistic infrared scene simulation images.And combined with a variety of algorithms to further speed up rendering,and then use the QT framework to pack it into a software.At last,through experiments it can be verified that with path tracing,infrared radiation transmission model can deliver a more accurate and real simulation result.At the same time,by testing the time performance of the software,it is verified that the GPU rendering pipeline greatly reduces the rendering time,and the remaining optimization algorithms also improve the time performance under certain conditions.