A real-time simplification method for 3D tree model based on viewpoint mutual information

Abstract

The invention discloses a real-time simplification method for a three-dimensional tree model based on viewpoint mutual information, which can make the rendering of trees in a forest scene smoother and achieve a better visualization effect, specifically including: dividing trees into two types according to the topological relationship between branches Nodes with a parent-child relationship are organized in the form of a multi-fork tree; the visual importance of each leaf in the leaf node is calculated according to the viewpoint mutual information VMI, and the leaves are reordered accordingly; multiple factors that affect the real-time simplification rate of nodes are proposed , set the corresponding function for each factor to determine the real-time simplification rate of the node; put forward the optimization measures when this method is used to render large-scale forest scenes, including the switching control of LOD, the replacement rendering of the canopy in the distant view, etc. Through the sorting of leaves based on VMI, the present invention can better maintain the visual appearance characteristics of trees while achieving a higher simplification rate. In addition, optimization measures in the rendering process ensure better visualization and rendering efficiency.

Description

technical field [0001] The invention belongs to the field of computer graphics and virtual geographic environment, and in particular relates to a real-time simplification method of a three-dimensional tree model based on Viewpoint Mutual Information (VMI). Background technique [0002] Currently, the simplification methods for 3D tree models mainly include image-based methods and geometry-based methods. Among them, the image-based rendering method (Image-based rendering, IBR) uses the two-dimensional image of the tree instead of the geometric model for rendering, thereby significantly reducing the rendering burden and improving rendering efficiency. But since images are two-dimensional objects, this method has some unavoidable disadvantages. First of all, due to the limitation of image resolution, this method generally cannot be used for the rendering of close-range models, otherwise it will produce a strong sense of unrealism; second, the visualization effect of this metho...

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Problems solved by technology

[0005] Purpose of the invention: Aiming at the shortcomings of the existing real-time simplification methods for 3D tree models in terms of visualization effects and rendering efficiency, the present invention discloses a real-time simplification method for 3D tree models based on viewpoint mutual information, which can satisfy the visualization effect in large-scale forest scenes Needs for improvement and rendering efficiency enhancement

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