Dual constraint based selection calling method of LOD (Level of Detail) model in three-dimensional scene

Abstract

The invention discloses a dual constraint based selection calling method of an LOD (Level of Detail) model in a three-dimensional scene. The dual constraint based selection calling method comprises entering into the three-dimensional scene; obtaining a viewpoint coordinate of a user and a center coordinate of the current object in the three-dimensional scene; calculating the sight distance and judging whether the current object is within the field of view of the user or not; calculating the interest degree of the user of a three-dimensional model and calling the user required level number of the current object model; combining with the distance constraint condition to select to call the user required LOD model of the current object; rendering and drawing the selected model; judging whether objects in the three-dimensional scene are traversed or not. According to the dual constraint based selection calling method of the LOD model in the three-dimensional scene, the LOD model can be selected to be called based on the interest degree and the distance, the requirements for the high image quality of the high interest degree of object of the user are met, meanwhile the weakening treatment is performed on the low interest degree of object of the user, and the rendering speed of a system is improved under the condition that the basic visual demand of the user is satisfied.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a method for selecting and calling an LOD model in a three-dimensional scene. Background technique [0002] In large-scale 3D application systems, solving the contradiction between realism and real-time rendering of complex scenes has always been a difficult topic in the field of computer graphics. In order to obtain higher-quality and more realistic visual effects, the details of the model are often The level requirements are relatively high, so the model will be more complicated, which will inevitably lead to situations where the memory capacity cannot be satisfied and time has to be sacrificed for storage exchange. In order to obtain the ideal visual effect and computer processing speed, it is necessary to use certain technology to effectively manage the models in the scene, so as to achieve the realism of the scene and the coordination and balance of real-time rendering. O...

AI Technical Summary

Problems solved by technology

[0004] In the early 1990s, many new research fields such as virtual reality and 3D visualization emerged, and there were higher and higher requirements for the generation speed of graphics. However, the performance of computers at that time could not meet the needs of real-time rendering of 3D complex scenes, so , many scholars have carried out research on the acceleration method of graphics rendering

[0017] The above studies on user interest models are all based on the two-dimensional Internet, but there are relatively few applications in the three-dimensional Internet, and a complete technical system has not been formed, and there are still many key issues to be resolved

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