基于光傳遞矩陣表示與重構(gòu)的高效真實感繪制技術(shù)
[Abstract]:In recent years, realistic graphics rendering is more and more widely used in modern production and life. As an important means of realistic graphics rendering, global illumination rendering technology has always been an important research direction of computer graphics. It simulates the position, shape, material, medium and light radiation transmission through complex calculations. The physical behavior of approaching light constitutes one of the foundations of applications requiring high-quality realistic images in industrial design, film and television entertainment, and virtual reality. As high-precision global illumination rendering involves a huge amount of computation, various algorithms have been proposed to solve this complex problem efficiently from different perspectives. The global illumination rendering technology with a large number of light sources is one of the most promising innovative solutions. It uses a large number of virtual light sources to simulate the indirect illumination effect of the real light source after multiple reflections of the object. It achieves high-efficiency and scalable global illumination rendering, so that users can be independent according to different application requirements. However, this technique poses great challenges in the collection of a large number of light sources, the rendering of out-of-core scenes and the reconstruction of sub-light paths of viewpoints. It still takes several minutes or even tens of minutes to produce a high-precision image. This dissertation mainly studies the global illumination of a large number of light sources. Efficient computation focuses on the representation, sampling and reconstruction of a large number of light source light transfer matrices and point-to-point incident light field light transfer matrices to achieve large-scale, high-quality global illumination rendering efficiently. A large number of light sources are rendered in the medium scene. Adaptive sampling and matrix reduction are used to accelerate the rendering of large numbers of light sources in the medium scene. The light transfer matrix is constructed for the incident light field and sparse sampling and reconstruction are used to accelerate the reconstruction of the incident light field. The out-of-core (based on external memory) rendering framework of GPU (graphics processor) is also used. These methods effectively overcome the shortcomings of traditional techniques and improve the efficiency by an order of magnitude. The main contributions of this paper are as follows: (1) Propose an efficient rendering technique for large number of light sources in non-dielectric scenes. The problem of visibility function of optical transfer matrix elements is solved by decoupling illumination and visibility calculation to make full use of the local coupling of visibility in non-media scenes and improve the computational efficiency. This technique not only saves the illumination details, but also speeds up the calculation greatly. The rendering speed is 7 times faster than that of the existing methods. An efficient rendering technique for a large number of light sources in a medium-containing scene is proposed. To solve the problem of column integral calculation of matrix with virtual point source (VPL) and virtual line source (VRL) segments as columns and drawing points and line of sight segments as rows, an adaptive matrix column sampling and filling technique is proposed to speed up the calculation by mining the local coupling of indirect refraction of media. Large amounts of light in media-containing scenes are realized by only using sparse samples. Compared with the existing methods, the efficiency of source high-precision and high-efficiency rendering is improved by an order of magnitude.... A new efficient reconstruction technique of incident light field at rendering point is proposed. The importance measure of sampling light field is proposed to balance the discrete light field. The reconstruction problem of incident light field is transformed into the sparse filling problem of the light transfer matrix of the incident light field. The light coupling between adjacent pixels in the same direction of incidence, adaptive sampling, sparse filling and fast joint filtering of the incident light transfer matrix can achieve high-quality and fast reconstruction of the incident light field at the rendered point. First, the problem of large-scale scene light source rendering with out-of-core geometry and light source data is transformed into the problem of planning traversal of light transfer sub-matrix. Then, according to the spatial locality of matrix elements and geometry, the sub-matrix and geometric data are adaptively partitioned to minimize the planning and rendering order of data transmission. The problem is transformed into a graph path search problem. For the first time, a large number of light sources supporting out-of-core and geometric data are rendered in parallel, which improves the scale of the supported scene by an order of magnitude and improves the efficiency of the memory-based CPU algorithm by an order of magnitude.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TP391.41
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