Multi-layer step-by-step optimized BIM model lightweight processing method and multi-layer step-by-step optimized BIM model lightweight processing system

Abstract

The invention discloses a multilayer step-by-step optimization BIM model lightweight processing method. The method comprises the following steps of separating attribute data and grid data in an imported BIM model file; generating a scene tree structure for each component in the grid data according to the attribute data to obtain a topological relation among the components; processing each component of the grid data to generate a plurality of components with different precisions; obtaining a view frustum instruction input by a user, and determining a to-be-displayed component and display precision in combination with a preset visual clipping rule and a topological relation; and pushing the to-be-displayed component corresponding to the display precision to a display interface of the user for display. The invention further discloses a multi-layer step-by-step optimization BIM model lightweight processing system. According to the method and the system disclosed by the invention, the reasonable range and display precision of the display component can be intelligently selected, so that the pressure of displaying a large-volume model by a front-end 3D engine is reduced. The loading fluency is improved, and the purpose of light weight is achieved.

Description

technical field [0001] The invention belongs to the field of BIM architectural design, and in particular relates to a multi-level step-by-step optimization BIM model lightweight processing method and system. Background technique [0002] The BIM model is the information carrier of building information based on the 3D model. It mainly includes the grid data of the building geometric model, that is, the Mesh data of the 3D model, which is the main data constituting the 3D model, and the attribute data of the building model, such as the name of the model component. , component type, component code, topological relationship between components, geometric attributes of components (such as length, width, height, area, volume, etc.) and other business or professional attribute data. [0003] When using professional BIM modeling software to create a BIM model, there will be a large amount of geometric model mesh data (Mesh) and attribute data. Due to the relatively large volume of th...

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Problems solved by technology

[0006] (1) Only digital-model separation is performed, although the model data is separated from the BIM model, so that the client does not need to load the attribute data part when displaying the 3D model, thereby reducing the memory pressure when the front-end loads the BIM model file , but the model mesh data (Mesh) to be displayed on the client side has not been reduced, and the pressure on the 3D engine display has not been reduced, and the purpose of lightweighting has not been achieved

[0007] (2) The BIM model to be transmitted to the front-end display is compressed, but no lightweight processing is done for the front-end 3D display layer, only the storage space and transmission bandwidth are reduced, and the model itself is not lightweight, so it is not suitable for large models The loading and display of the scene did not achieve the purpose of lightweight

[0008] (3) When performing LOD processing on the BIM model, manual operations are used, which is not conducive to the frequent update and storage of the BIM model

[0009] (4) The occlusion and clipping of the BIM model is not implemented, resulting in the inability to smoothly load the model with a lot of details inside the building and a lot of model components

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