A Method of Constructing Parametric 3D Tree Symbolic Model

Abstract

The invention discloses a method for constructing a parameterized three-dimensional tree symbol model, which can be used for three-dimensional symbolizing expression of trees in a three-dimensional geographic scene and comprises the following steps of: (1) establishing a tree branch and trunk parameter model; (2) establishing a tree branched structure parameter model; (3) establishing a phyllotaxis structure parameter model; (4) establishing a leaf parameter model. The method is based on the case of abstracting visual form characteristics of trees into a plurality of basic form elements with common characteristics and establishing a corresponding database; based on the database, the form elements are integrated and organized by adopting a parameterizing method so as to meet the requirement for common characteristic expression and visual realistic simulation on the trees; the method has the characteristics of simplicity, rapidness, convenience and visualizability.

Description

technical field [0001] The invention belongs to the field of computer graphics, and in particular relates to a method for constructing a parameterized three-dimensional tree symbolic model. Background technique [0002] Existing tree modeling methods can be roughly divided into two categories, namely rule-driven tree modeling methods and data-driven tree modeling methods. [0003] (1) Rule-driven tree modeling method [0004] For rule-based methods, it is generally necessary to generate tree models according to complex rules and grammars as driving general principles. As early as 1994, Prusinkiewicz et al. carried out some related research based on the idea of ​​L-system, described the growth rules of plant morphology in a grammatical way, and added information such as branch length ratio, and initially realized the representation method of plants. In 1995, Weber et al. generated a realistic tree model according to a set of geometric rules. In 1998, DeReffye et al. also u...

AI Technical Summary

Problems solved by technology

However, the mutual occlusion of tree structures makes it difficult for laser scanners to obtain complete information about trees, which will directly affect the realism and visual effect of the final 3D tree modeling

In addition, the modeling cost of this method is relatively high. On the one hand, it requires professional equipment for data collection. On the other hand, the amount of model data to be processed is quite large. In order to obtain better results in point cloud data processing, a large amount of manual intervention is often required.

[0008] Existing tree modeling methods cannot simultaneously meet the special needs of 3D tree modeling for common feature modeling, parametric modeling, multi-level of detail modeling, and intuitive parameter adjustment.

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