Pixelate virtual tree illumination influenced area obtaining method

Abstract

The invention discloses a pixelate virtual tree illumination influenced area obtaining method, which comprises the following steps of: (1) extracting a tree structure type according to a geometric shape feature of a tree, and building a tree framework library; (2) automatically determining the tree structure type through geometric shape feature information of a three-dimensional model of virtual tree growth simulation; (3) forming an equivalent calculation three-dimensional model for producing a tree illumination influenced area; (4) generating a time sequence of illumination influenced area calculation, and calculating the altitude angle of the sun at each time point by using geographic location information of the virtual tree growth simulation; and (5) generating an illumination shadow of a virtual tree at each time point by using the equivalent calculation three-dimensional model, and carrying out superimposed calculation by using a pixel as a basic unit to obtain the pixelate virtual tree illumination influenced area. The pixelate virtual tree illumination influenced area obtaining method has the advantages of effectively reducing complexity, increasing speed, and being suitable for forest dynamic growth simulation with large scale and large dimension.

Description

technical field [0001] The invention relates to a pixelated virtual tree illumination-influenced area acquisition method. Background technique [0002] The competition of plants for light resources is a difficult point in plant community growth simulation and forest landscape simulation. Quickly obtaining more accurate areas affected by tree lighting is of great significance for truly simulating the growth process of trees and the reproduction and development process of forest communities. [0003] In the existing forest growth simulation, the FON model, that is, the plant circle of influence model, is generally used to obtain the area affected by tree illumination. The FON model is a method to describe plant growth resources, and uses a circle of influence to describe the range of plant demand for resources. However, due to the different latitudes of plant growth, the shadow of its light is often not a standard circular area. The higher the latitude, the flatter the shado...

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Problems solved by technology

[0006] In order to overcome the disadvantages of the existing methods for obtaining tree illumination affected areas, which are complex and slow, and cannot be used for large-scale and large-scale forest dynamic growth simulation, the present invention provides a method that effectively reduces complexity, improves speed, and is suitable for Method for obtaining pixelated virtual tree illumination-affected area for large-scale and large-scale forest dynamic growth simulation

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