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Three-dimensional digital tree growth modeling method based on joint constraining of illumination and growth equations

A three-dimensional digital and growth modeling technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problem of not being able to constrain the growth height of trees

Active Publication Date: 2017-12-22
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

[0006] In order to overcome the deficiency that the existing three-dimensional digital tree growth modeling method cannot constrain the growth height of trees, the present invention provides a three-dimensional digital tree growth modeling method constrained by illumination and growth equations
The invention can solve the technical problem that the growth height of trees cannot be restricted under the condition of sufficient light resources

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  • Three-dimensional digital tree growth modeling method based on joint constraining of illumination and growth equations
  • Three-dimensional digital tree growth modeling method based on joint constraining of illumination and growth equations
  • Three-dimensional digital tree growth modeling method based on joint constraining of illumination and growth equations

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Embodiment Construction

[0060] refer to Figure 1-11 . The specific steps of the three-dimensional digital tree growth modeling method constrained by illumination and growth equations of the present invention are as follows:

[0061] Step 1. Set the growth environment and parameters.

[0062] Set an illumination space as the range defined by the cuboid, each side of the cuboid is longer than the length, width and height of the three-dimensional digital tree to be constructed; specify the position of the initial tree root, which is located in the lighted position of the illumination space, in three-dimensional coordinates (x 0 ,y 0 ,z 0 ) form; voxelize the lighting space, that is, divide it into small cubes called voxels; assign the initial lighting conditions of this lighting space, use the number 1 to indicate full illumination and no occlusion; use the number 0 to indicate No light, use a real number between 0 and 1 to represent the relative value of the light intensity; specify the branching...

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Abstract

The invention discloses a three-dimensional digital tree growth modeling method based on joint constraining of illumination and growth equations, so that a technical problem that the existing three-dimensional digital tree growth modeling method can not constrain the growth height of the tree is solved. The method disclosed by the invention is characterized in that according to a plant growth equation, ring-to-ring iterative growth is carried out by inputting a starting position and an initial trunk direction of a three-dimensional digital tree root as well as illumination information of the tree growth space. Illumination resources obtained by terminal buds and lateral buds of all branches are calculated; convergence and allocation volumes of the illumination resources are calculated; growth speeds of the trees are constrained based on a growth equation and whether each terminal bud and each lateral bud grow are determined and the growth speeds are determined; and new branch positions and geometric values of branch models are calculated and radius values of all nodes of the branches are updated. And after iterative growth stopping, a branch model is outputted and leaves are added. Therefore, a technical problem that the growth height of the tree can not be constrained on the condition of full illumination resources is solved.

Description

technical field [0001] The invention relates to a three-dimensional digital tree growth modeling method, in particular to a three-dimensional digital tree growth modeling method constrained by illumination and growth equations. Background technique [0002] 3D digital trees are indispensable and important objects in virtual reality, digital forestry, 3D games and movies. In recent years, research and technical development are shifting from static 3D digital tree simulation to dynamic growth simulation of 3D digital trees. [0003] Document 1 "Palubicki W, Horel K, Longay S, et al. Self-organizing tree models for image synthesis [J]. ACM Transactions on Graphics, 2013, 28(3): 5801-5810." discloses a three-dimensional digital tree modeling method. The steps of the three-dimensional digital tree growth modeling method are as follows: the first step is to input the initial tree model; the second step is to calculate the local lighting environment for the growth of side buds an...

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Application Information

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IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 易磊郗润平郭建伟李红军孟维亮张晓鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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