Large-scale three-dimensional forest drawing method

Abstract

The invention provides a large-scale three-dimensional forest drawing method. The large-scale three-dimensional forest drawing method comprises the steps of S1, reading ground elevation data of a three-dimensional forest drawing area and constructing a digital ground model; s2, separating a forest region from the digital ground model and rendering the forest region by utilizing grassland noise texture; s3, setting a forest density random distribution function and generating a tree distribution point information graph in the forest area; s4, setting tree basic mode information for each tree distribution point; s5, obtaining tree comprehensive mode information according to the ground elevation data, the tree distribution point information and the tree basic mode information; s6, according tothe tree comprehensive mode information, achieving close-range tree texture display at different visual angles; and S7, achieving explicit and implicit display of the forest along with the change ofthe observation distance by utilizing a multi-detail-level technical method. According to the method, the large-scale three-dimensional forest can be rapidly drawn, and the drawn three-dimensional forest is high in sense of reality.

Description

technical field [0001] The invention relates to digital earth visualization technology, in particular to a large-scale three-dimensional forest rendering method. Background technique [0002] Digital Earth is a technology that uses massive earth information to describe the earth with multi-resolution, multi-scale, multi-time and space, and multi-type, and uses it as a tool to support and improve human activities and quality of life. It is used in civilian and military fields. have a very wide range of applications. Digital Earth needs to be constructed and rendered with 3D images to play its role, and the biggest challenge in 3D image construction and rendering is the generation and real-time rendering of large-scale scenes. In particular, the morphological structure of the forest area is complex, and it is difficult to render with a unified model modeling method. [0003] According to different modeling methods, the construction technology of 3D forest can be divided into...

AI Technical Summary

Problems solved by technology

The technique of drawing 3D forest based on polyhedron or other simple geometric bodies can only represent the distribution of trees symbolically, but the realism of the forest is greatly reduced, and it is difficult to realize the dynamic display of the forest; the 3D forest drawn by point-based rendering technology has a stronger sense of reality , but the acquisition method of the sample data is complicated, and it is greatly affected by noise; the image-based rendering technology is suitable for complex scene rendering, but it is greatly affected by the image resolution, the sense of reality is low, and it is difficult to realize the dynamics of the 3D forest Display; texture-based rendering technologies all rely on real 3D models, so the rendering speed will be greatly affected, and it is difficult to achieve fast and large-scale rendering

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