A triangular mesh generation algorithm based on the model of the STL file was proposed.By using divide and conquer

the model of the STL file was divided into multiple sub-regions

and the boundaries of the subregions were mapped to a two-dimensional plane to generate a mesh.The two-dimensional mesh was then mapped back to a three-dimensional surface.Finally

the sub-region meshes were stitched to generate a complete surface mesh.The nearest-neighbor search algorithm based on k-dtree was used to improve the reverse mapping process

which reduced the time complexity of reverse mapping and improved the overall mesh generation efficiency.The actual casting example shows that the mesh generated by the algorithm presents good quality.