摘要： 现有的乐高(LEGO)模型自动构建算法依赖各种局部搜索机制优化构建结果,复杂度较高,在处理复杂、高分辨率模型时较为费时。为此,在归纳比较现有算法存在问题的基础上,提出一种高性能LEGO模型自动构造算法。采用自顶向下解决LEGO问题的方法,减小搜索空间,加快循环收敛。给出一种延迟构造图的方法,在预挖空后再构造竖直方向的图,缩短预挖空步骤的时间。实验结果表明,与现有算法相比,该算法能够在保持模型质量的前提下,对于大型、高分辨率的模型,可缩短50%~78%的构造时间,效率明显提高。
关键词:
三维快速原型,
乐高建模,
自动构造,
自顶向下,
预挖空
Abstract: Existing LEGO model automatic construction algorithms resort to stochastic optimization techniques to find the solution.Such approaches tend to be time-consuming when dealing with extremely large models.By generalizing and comparing existing research results,this paper proposes a highly efficient LEGO automatic construction algorithm.It devises a partition based top-down optimization flow,which significantly reduces the search space to speed up the arrival of convergence.It develops a delayed graph construction technique,which builds the vertical graph after pre-hollowing to expedite the pre-hollowing process.Experimental results show that,compared with the existing algorithms,the algorithm reduces the total construction time by 50%~78% and improves the efficiency.
Key words:
3D rapid prototype,
LEGO modeling,
automatic construction,
top-down,
pre-hollowing
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