Generating point clouds for slicing free-form objects for 3-d printing

Abstract

3-D printing, also known as additive manufacturing, has gained a lot of attention both within and outside CAD research. Even popular media have touted the technology as one of the game changer technologies of the 21st century. Simply stated, most printing devices add material to an unfinished part, layer by layer, until the entire object is completed. In order to make this happen, the object is sliced into thin layers which are produced and glued together. Since NURBS are the standard form of modeling tools, the process entails converting the NURBS into an STL model (piecewise triangular model) which is then sliced into a set of closed polygonal loops. In order to avoid the many problems with the STL-based slicing, in this paper we investigate a point cloud- based approach to direct slicing of NURBS based models. It uses the original NURBS model and converts the model into a point cloud, based on layer thickness and accuracy requirements, for direct slicing. The only major computational requirement is point evaluation which can be done error free and in an inexpensive manner. The generation of the point cloud is the main topic of this paper.

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Citation

William Oropallo, Les A. Piegl, Paul Rosen, and Khairan Rajab. Generating point clouds for slicing free-form objects for 3-d printing. Computer-Aided Design and Applications, 14(2):242--249, 2017.

Bibtex


@article{Oropallo.2017.CADA,
  title = {Generating point clouds for slicing free-form objects for 3-D printing},
  author = {William Oropallo and Les A. Piegl and Paul Rosen and Khairan Rajab},
  journal = {Computer-Aided Design and Applications},
  volume = {14},
  number = {2},
  pages = {242--249},
  year = {2017},
  publisher = {Taylor \& Francis},
  abstract = {3-D printing, also known as additive manufacturing, has gained a lot of attention 
    both within and outside CAD research. Even popular media have touted the technology as one of 
    the game changer technologies of the 21st century. Simply stated, most printing devices add 
    material to an unfinished part, layer by layer, until the entire object is completed. In order 
    to make this happen, the object is sliced into thin layers which are produced and glued together. 
    Since NURBS are the standard form of modeling tools, the process entails converting the NURBS 
    into an STL model (piecewise triangular model) which is then sliced into a set of closed polygonal 
    loops. In order to avoid the many problems with the STL-based slicing, in this paper we 
    investigate a point cloud- based approach to direct slicing of NURBS based models. It uses the 
    original NURBS model and converts the model into a point cloud, based on layer thickness and 
    accuracy requirements, for direct slicing. The only major computational requirement is point 
    evaluation which can be done error free and in an inexpensive manner. The generation of the point
    cloud is the main topic of this paper.}
}