Abstract: The present invention provides an octree-based three-dimensional building model LOD method, specifically comprising the following steps: S1, reading three-dimensional building model data; S2, setting a tree depth Depth parameter of the octree; S3, respectively merging leaf node bounding boxes of the octree according to layers, and establishing coarse grid blocks; S4, merging the coarse grid blocks of the components of each layer; S5, performing triangularization; S6, calculating a normal vector of the coarse grid block; S7, merging the simplified components to form a building model of a coarse grid block; S8, deleting internal vertexes; S9, setting materials or textures; and S10, outputting the three-dimensional building LOD model.

Abstract: The present invention provides an octree-based three-dimensional building model LOD method, specifically comprising the following steps: S1, reading three-dimensional building model data; S2, setting a tree depth Depth parameter of the octree; S3, respectively merging leaf node bounding boxes of the octree according to layers, and establishing coarse grid blocks; S4, merging the coarse grid blocks of the components of each layer; S5, performing triangularization; S6, calculating a normal vector of the coarse grid block; S7, merging the simplified components to form a building model of a coarse grid block; S8, deleting internal vertexes; S9, setting materials or textures; and S10, outputting the three-dimensional building LOD model.

Abstract: A cutter for cutting a linear element includes a support frame, a pair of blade holders disposed opposite to each other and movably disposed on the support frame, a pair of blades facing each other and each disposed on one of the pair of blade holders, a pair of holding blocks facing each other and each disposed on one of the pair of blade holders, and a driving device disposed on the support frame. The driving device drives the pair of blade holders to move synchronously in a direction approaching each other or a direction separating away from each other. The pair of holding blocks clamp the linear element and the pair of blades cut off the linear element clamped by the pair of holding blocks while the pair of blade holders move synchronously in the direction approaching each other.

Abstract: A vacuum adsorption module includes a supporting block, a carrier installed and positioned on the supporting block, and a plurality of valves installed on the supporting block. The supporting block has a plurality of air connection holes, each row of air connection holes is connected to a total air path formed in the supporting block via a branch air path formed in the supporting block. The carrier has a plurality of air suction holes corresponding to the air connection holes. The valves control closing and opening of the branch air paths between the plurality of rows of air connection holes and the total air path. An adsorption length of the carrier in a column direction of the array is adjustable to match a length of an article to be adsorbed by the carrier by changing a number of the valves to be closed or opened.

Abstract: A cutter for cutting a linear element includes a support frame, a pair of blade holders disposed opposite to each other and movably disposed on the support frame, a pair of blades facing each other and each disposed on one of the pair of blade holders, a pair of holding blocks facing each other and each disposed on one of the pair of blade holders, and a driving device disposed on the support frame. The driving device drives the pair of blade holders to move synchronously in a direction approaching each other or a direction separating away from each other. The pair of holding blocks clamp the linear element and the pair of blades cut off the linear element clamped by the pair of holding blocks while the pair of blade holders move synchronously in the direction approaching each other.