Frame selection method and system based on large BIM (Building Information Modeling) model

A frame selection and model technology, which is applied in the field of building information model and computer graphics, can solve problems such as unsatisfactory speed, and achieve the effect of reducing collision detection and improving frame selection speed.

Active Publication Date: 2016-12-21
SHANGHAI TONGZHU INFORMATION TECH
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AI Technical Summary

Problems solved by technology

[0004] The traditional technology uses the construction of a marquee collider to use the physics engine to collide to get the selected object. Due to the complete dependence on the physics engine, the speed is not ideal when the number of model objects is huge.

Method used

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  • Frame selection method and system based on large BIM (Building Information Modeling) model
  • Frame selection method and system based on large BIM (Building Information Modeling) model

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] According to a method of frame selection based on a large-scale BIM model provided by the present invention, comprising:

[0035] Marquee cone calculation steps: After the frame is selected, use the intersection points of the marquee with the near plane and the far plane of the camera respectively to obtain the planes of the marquee cone;

[0036] Bounding box judging step: in the BIM model, extract the object whose bounding box is in the marquee cone;

[0037] Checking steps: For the object who...

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Abstract

The invention provides a frame selection method and a system based on a large BIM (Building Information Modeling) model. The method comprises steps of selected frame cone calculation, surrounding box judgment, checking, mesh collider building, collision and frame selection result combination. By using multiple times of pre-selection, the number of objects in need of collision detection is reduced to the minimum, the frame selection speed of the large BIM model is improved, a large number of objects outside the selected frame can be reasonably selected, objects completely in the selected frame are selected at an extremely low cost, and collision detected by using a physical engine can be reduced greatly.

Description

technical field [0001] The present invention relates to the field of building information model and computer graphics, in particular, to a frame selection method and system based on a large BIM model. Background technique [0002] Computer graphics is the use of computers to study the relevant principles and algorithms of the representation, generation, processing, and display of graphics. To represent a three-dimensional object in a computer, it must first be represented by its geometric model. Therefore, the modeling of 3D models is the basis of computer graphics and the premise of other content. Expressing a geometric object can be expressed by a mathematical spline function or an implicit function; it can also be expressed by a triangular mesh expressed by sampling points on a smooth surface and their connection relationship (that is, the sliced ​​linearity of a continuous surface approach). [0003] BIM is the abbreviation of Building Information Modeling, which is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 尹仕友
Owner SHANGHAI TONGZHU INFORMATION TECH
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