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2019
Article
Open Access

**Mill and fold: shape simplification for fabrication**

*Muntoni A., Nuvoli S., Scalas A., Tola A., Malomo L., Scateni R.*

We introduce a pipeline for simplifying digital 3D shapes and fabricate them using 2D polygonal flat parts. Our method generates shapes that, once unfolded, can be fabricated with CNC milling machines using special tools called V-Grooves. These tools create V-shaped furrows at given angles depending on the shape of the used tool. Milling the edges of each flat facet simplifies the manual assembly, which consists only in folding adjacent facets at a constrained angle. Our method generates simplified shapes where every dihedral angle between adjacent facets belongs to a restricted set, thus making the assembly process quicker and more straightforward. Firstly, our method automatically computes a simplified version of the input model, using the marching cubes algorithm on the original mesh and iteratively performing local changes on the resulting triangle mesh. The user can then perform an additional manual simplification to remove unwanted facets. Finally, an unfolding algorithm, which takes into account the thickness of the material, flattens the polygonal facets onto the 2D plane, so that a CNC milling machine can fabricate it from a sheet of rigid material.**Source: **Computers & graphics 80 (2019): 17–28. doi:10.1016/j.cag.2019.03.003**DOI: **10.1016/j.cag.2019.03.003

**See at: **
ISTI Repository | Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | CNR ExploRA | Computers & Graphics

2019
Conference object
Unknown

**Split and mill: user assisted height-field block decomposition for fabrication**

*Muntoni A., Spano L. D., Scateni R.*

We present here Split and Mill: an interactive system for the manual volume decomposition of free form shapes. Our primary purpose is to generate portions respecting the properties allowing to mill them with a 3-axis milling machine. We show that a manual decomposition is competitive with the automatic partitioning when the user is skilled enough. We, thus, think that our tool can be beneficial for the practitioners in the field, and we release it as free software.**Source: **Italian Chapter Conference 2019 - Smart Tools and Apps in computer Graphics, STAG 2019, pp. 61–70, Cagliari, Italy, November 14-15, 2019**DOI: **10.2312/stag.20191364

**See at: **
diglib.eg.org | CNR ExploRA

2018
Conference object
Open Access

**Simplification of shapes for fabrication with V-groove milling tools**

*Muntoni A., Scalas A., Nuvoli S., Scateni R.*

We introduce here a pipeline for simplifying digital 3D shapes with the aim of fabricating them using 2D polygonal flat parts. Our method generates shapes that, once unfolded, can be fabricated with CNC milling machines using special tools called V-Grooves. These tools make V-shaped furrows at given angles depending on the shape of the used tool. Milling the edges of each flat facet simplifies the manual assembly that consists only in folding the facets at the desired angle between the adjacent facets. Our method generates simplified shapes where every dihedral angle between adjacent facets belongs to a restricted set, thus making the assembly process quicker and more straightforward. Firstly, our method automatically computes a simplification of the model, iterating local changes on a triangle mesh generated by applying the Marching Cubes algorithm on the original mesh. The user performs a second manual simplification using a tool that removes spurious facets. Finally, we use a simple unfolding algorithm which flattens the polygonal facets onto the 2D plane, so that a CNC milling machine can fabricate it with a sheet of rigid material.**Source: **STAG 2018 - Smart Tools and Applications in Graphics, Brescia, Italy, 18-19 October 2018**DOI: **10.2312/stag.20181293

**See at: **
diglib.eg.org | ISTI Repository | CNR ExploRA

2018
Article
Open Access

**Fabrication oriented shape decomposition using polycube mapping**

*Fanni F. A., Cherchi G., Muntoni A., Tola A., Scateni R.*

In recent years, fabrication technologies have developed at a breakneck pace. However, some limitations on shape and dimension still apply both to additive and subtractive manufacturing, and one way to bypass them could be the partition of the object to build. We present here a novel algorithm, based on the polycube representation of the original shape, able to decompose any model into smaller parts simpler to fabricate. We first map the shape in a polycube and, then, split it to take advantage of the polycube partitioning. In this way, we obtain quite easily a partition of the model. In this work we also study and analyze pros and cons of this partitioning scheme for fabrication, when using both the additive and subtractive pipelines. Our proposed partitioning scheme is computationally light, and it produces high-grade results, especially when applied to models that we can map onto polycubes with a high compactness value.**Source: **Computers & graphics 77 (2018): 183–193. doi:10.1016/j.cag.2018.10.010**DOI: **10.1016/j.cag.2018.10.010

**See at: **
Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | Computers & Graphics | CNR ExploRA | www.sciencedirect.com | Computers & Graphics