Geometric figure simplification method for BIM model

A geometry and model technology, applied in the field of BIM model geometry simplification, can solve problems such as inability to maintain geometric features, broken surfaces, etc., achieve smooth browsing and management, and solve high requirements.

Pending Publication Date: 2020-01-10
CHANGJIANG SURVEY PLANNING DESIGN & RES +1
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  • Abstract
  • Description
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Problems solved by technology

In the simplification process of geometric figures, multiple levels of detail LOD (Levels of Details, level of detail model) are generally used for hierarchical compression.

Method used

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  • Geometric figure simplification method for BIM model
  • Geometric figure simplification method for BIM model
  • Geometric figure simplification method for BIM model

Examples

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Example Embodiment

[0108] Example

[0109] The present invention will now be described in detail with an embodiment of the BIM model geometry simplification applied to a building, which also has a guiding role for the present invention to be applied to other BIM model geometry simplification.

[0110] The BIM model selected in this embodiment is an architectural model of a certain unloading house, and the data volume is 1948kb.

[0111] A method for simplifying the geometry of the architectural model of a certain unloading house, including the following steps:

[0112] Step 1: Obtain the surface geometry data of the BIM model body;

[0113] Using the data export function of BIM software, export the architectural model data of a certain unloading house into IFC format data, and obtain the material information and surface geometric data of the building model of a certain unloading house; the geometric data obtained in the initial situation is a triangular grid , with the merging and simplification...

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Abstract

The invention discloses a geometric figure simplification method for a BIM model. The geometric figure simplification method comprises the following steps: 1, acquiring surface geometric data of a BIMmodel body; 2, judging whether a certain grid surface of the BIM model is a triangular surface or not; judging whether the grid is a triangular patch or not according to the number of vertexes of a certain grid of the BIM model; when the polygon is a triangular surface, carrying out triangular patch merging simplification on the polygon, and then carrying out boundary line simplification on the merged polygon by adopting a three-point method; 3, according to a short edge principle, moving a point deleted after simplifying the boundary line of the polygon to the other vertex of the short edgein the adjacent edges; and 4, according to the obtained material information, endowing the simplified model with corresponding material attributes according to grid division. According to the geometric figure simplification method, simplification of triangular patches and boundaries of geometric data of the BIM model can be quickly realized; and by judging the shapes after combination, the advantages of the original geometric figure characteristics of the BIM model can be reserved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, more specifically, it relates to a method for simplifying the geometry of a BIM model. More specifically, it is a BIM model based on the adjacent three-point method and the merging of triangle faces, while considering the simplification of boundary lines and the merging and simplification of triangular mesh faces, and distinguishing between triangular faces and other polygonal faces. Geometry simplification method. Background technique [0002] The full English name of Building Information Modeling (BIM) is Building Information Modeling, which is a complete information model that can integrate engineering information, processes and resources in different stages of the project's life cycle into one model, which is convenient Used by all parties involved in the project. Through the three-dimensional digital technology to simulate the real information of the building, it provides ...

Claims

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Application Information

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IPC IPC(8): G06T19/20
CPCG06T19/20
Inventor 谢明霞杨爱明张力马能武马瑞
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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