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Constructing method for level detailed model of coniferous plant canopy

A technology of hierarchical details and hierarchical models, applied in the field of interdisciplinary research results, to achieve the effect of simplifying needle leaves, ensuring high realism, and overcoming aliasing

Inactive Publication Date: 2009-07-22
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, line merging operations need to be performed iteratively

Method used

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  • Constructing method for level detailed model of coniferous plant canopy
  • Constructing method for level detailed model of coniferous plant canopy
  • Constructing method for level detailed model of coniferous plant canopy

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Experimental program
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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0050] The core of this method lies in the cylindrical model representation and line model representation method of needle leaves, as well as the line merging operation. The method specifically includes 8 steps, of which the first 5 steps are completed in the preprocessing stage, and the last 3 steps are completed in the real-time rendering stage.

[0051] 1. First input the coniferous tree model and extract the information of the leaves.

[0052] 2. Establish a cylindrical model representation of needle leaves, that is, polygonize the cylinder and represent it as a series of prisms with continuously changing sides.

[0053] 3. Establish the line model representation of the needle leaves, that is, use the center line of ...

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Abstract

The method is a construction method of hierarchical detail models of conifer plant canopy. When the projection width of conifer in an image space is bigger than a pixel value, column models are used for describing conifer, and the column models are automatically processed by polygonization according to the distance so as to be expressed as prisms with different numbers of seamed edges. If the distance is continuously increased and the projection width of conifer in an image space is smaller than a pixel value, the column models are degenerated to be linear models so as to greatly reduce the geometric complexity of models. In addition, combination operation can be carried out between lines, and a small number of lines can used to express a whole tree crown so as to realize further compression of geometric models of conifer. In order to correctly describe the information of sub-pixel space and enhance the vivid effect of drawing, the linear models used in the method are semitransparent, and the transparency of each line depends on the distance between a plant corpus and a view point as well as the corresponding simplification error.

Description

technical field [0001] The invention belongs to the interdisciplinary research achievement of the combination of computer graphics and digital agriculture and forestry. Suitable for quick drawing of this special and common plant species of conifers. It can be used in applications such as urban visualization, garden design, flight simulation, virtual reality and computer games, as well as assisting agroforestry scientists in visualizing their research objects. Background technique [0002] The rendering of plant scene is an important subject in computer graphics. Many applications involving outdoor scenes, such as urban planning, garden design, etc., need to add plant models to existing scenes and render them to enhance the realism of the rendering results. However, plants usually have a lot of geometric details, and their addition will cause the rendering speed to drop and fail to meet the real-time requirements. Therefore, how to improve the drawing speed under the premi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/10G06T17/00
Inventor 张晓鹏邓擎琼
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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