Method for constructing surface reflection characteristics of real object in virtual environment
A real object and surface reflection technology, applied in 2D image generation, image data processing, instruments, etc., can solve the problems of large deviation of base material solution, large time cost, large error of interpolation results, etc., and achieve stable interpolation results and interpolation The result is smooth and the effect of reducing time and space overhead
Inactive Publication Date: 2014-06-25
BEIHANG UNIV
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Document 9-Wang J, Dong Y, Tong X, et al.SVBRDF Bootstrapping[R].MSRA, 2009. Propose a bootstrapping technology, first select sparse SVBRDF sampling points to collect BRDF data with high density in the angle domain space, and then Collect BRDF data at low density in the angle domain space for all sampling points of SVBRDF, and use the spatial redundancy and local linear correlation features of SVBRDF to reconstruct the entire SVBRDF data, but the obtained SVBRDF cannot be edited
[0006] At present, the data-driven SVBRDF construction technology is the current mainstream method due to its fidelity and versatility. In related technologies where the construction results can be edited, there are large errors in interpolation results, large construction process time costs, and large deviations in the solution of base materials. question
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[0029] Such as figure 1 Shown, concrete steps of the present invention are as follows:
[0030] 1. Construct SVBRDF data matrix M
[0031] The rows of the matrix M represent the changes in the spatial domain of the SVBRDF data, that is, each row is the BRDF data of a sampling point on the surface of the object, and the columns of the matrix M represent the changes in the angle domain of the SVBRDF, that is, each column represents a different incident direction of the light source. After the SVBRDF data are parameterized according to the incident direction of the light source and the viewing direction, the corresponding position of M in the matrix is calculated and filled.
[0032] 2. Interpolation of the Laplace equation of the BRDF of a single sampling point
[0033] For any row in the selected γ row data, that is, the BRDF data of a vertex is organized into a two-dimensional concentric square graph, such as figure 2 shown. The conversion method between concentric circ...
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The invention provides a method for constructing surface reflection characteristics of a real object in a virtual environment, and the method provided by the invention comprises the following steps: describing a spatially-varying reflection attribute by use of a spatially-varying bidirectional reflectance distribution function (SVBRDF); constructing the SVBRDF data of a real object by collecting the image of the object under different irradiation conditions and in different viewing directions; decomposing the SVBRDF data into a plurality of base materials and weight factor distribution graphs corresponding to the base materials; and lively constructing the surface reflection effect of the object in the real world in the virtual environment constructed by a computer by utilizing the base materials and the corresponding weight factor distribution graphs. Based on the spatial redundancy of the SVBRDF data, the method can provide a compact and editable SVBRDF expression, and can be used for lively reconstructing the surface reflection characteristics of the object in the real world in the virtual environment constructed by the computer.
Description
technical field [0001] The invention relates to a method for constructing the surface reflection characteristics of a real object in a virtual environment, and belongs to the technical field of computer virtual reality. Background technique [0002] Using computers to model the reflection properties of different materials on the surface of objects in the real world and realistically reproduce them has a wide range of applications in the fields of animation games, film and television production, and digital museums. The distribution patterns of the surface of the object are varied, and it is very difficult to manually model the limited material model provided by commercial modeling software (3DMax, Maya, etc.), and even cannot be accurately represented. Therefore, it is necessary to study the material reflection of the surface of the object based on the collected images of the real object Attribute acquisition and modeling technology to realize the surface reflection characte...
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IPC IPC(8): G06T11/00
Inventor 胡勇赵沁平齐越
Owner BEIHANG UNIV