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Three-dimensional pyramid construction method based on triangular patch number division

A triangular patch and construction method technology, applied in 3D modeling, image data processing, structured data retrieval, etc., can solve problems such as not using spatial index

Pending Publication Date: 2021-10-01
SPEED SPACE TIME INFORMATION TECH CO LTD
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Problems solved by technology

The four-level cache is controlled by its own cache management module, and the multi-level cache of the client and the database server is managed uniformly through the multi-level cache adaptive management module, and the caches of all levels are adaptively adjusted to improve the large-scale three-dimensional spatial data. The efficiency of dynamic scheduling, this method is to cache the model file without using the spatial index

Method used

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  • Three-dimensional pyramid construction method based on triangular patch number division
  • Three-dimensional pyramid construction method based on triangular patch number division
  • Three-dimensional pyramid construction method based on triangular patch number division

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Embodiment

[0055] Example: such as Figure 1-2 As shown, the three-dimensional pyramid construction method based on the division of the number of triangle faces specifically includes the following steps:

[0056] S1: Set the maximum number of triangles for a single node respectively Face Count Parameters and the maximum number of triangles in a single component meshFaceCount parameter;

[0057] In the step S1, the maximum number of triangle faces of a single node is set Face Count The parameter is 256000, which is the upper limit of the number of triangular faces of a single node in a binary tree; in the process of simplification and merging of triangular faces, the number of simplified node triangular faces will be adjusted according to the FaceCount parameter; set the maximum triangular face of a single component Number meshFaceCount The parameter is 65536, which is the upper limit of the number of triangular patches of a single component; when the components are merged, meshFa...

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Abstract

The invention discloses a three-dimensional pyramid construction method based on triangular patch number division. The three-dimensional pyramid construction method comprises the steps of: S1, setting a single-node maximum triangular patch number FaceCount parameter and a single-component maximum triangular patch number meshFaceCount parameter respectively; S2, reading data of the three-dimensional model, and analyzing geometric, texture and attribute information of the three-dimensional model; S3, setting the maximum depth of the binary tree, and setting the read three-dimensional model as a root node of the binary tree; S4, determining the coordinate axis direction of node splitting, and splitting the binary tree; S5, traversing the binary tree, and recalculating an outer bounding box of each node of the binary tree; combining components with the same texture in the three-dimensional model, and constructing a component set; S6, traversing binary tree nodes, calculating triangular patch simplification parameters of the current node, and performing triangular patch simplification; S7, recalculating the texture coordinates of the simplified triangular patch; and S8, outputting model pyramid data.

Description

technical field [0001] The invention relates to the technical field of three-dimensional model index creation, in particular to a method for constructing a three-dimensional pyramid based on the number division of triangular faces. Background technique [0002] 3D GIS has become one of the main landmarks of GIS technology today and even in the future. It breaks through the shackles of monotonous representation of spatial information on a two-dimensional map plane, and provides more effective auxiliary decision support for all walks of life and people's daily life. . As the concept of "Digital Twins" has gained popularity, in smart cities, smart parks, smart factories and other industrial applications, the demand for 3D models of city-level large-scale scenes is becoming more and more intense. [0003] The efficient organization and management technology of massive 2D GIS data and tiled terrain landscape data has been relatively mature, and the efficient and integrated organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F16/29G06T17/05
CPCG06F16/29G06T17/05
Inventor 徐云和姬炜李华栋
Owner SPEED SPACE TIME INFORMATION TECH CO LTD
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