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Geoffroy LAUVAUX Research Engineer (CIRTES) Orientation of artistic parts with Stratoconception ® Stratoconception ®, Part orientation, Art.

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Presentation on theme: "Geoffroy LAUVAUX Research Engineer (CIRTES) Orientation of artistic parts with Stratoconception ® Stratoconception ®, Part orientation, Art."— Presentation transcript:

1 Geoffroy LAUVAUX Research Engineer (CIRTES) Orientation of artistic parts with Stratoconception ® Stratoconception ®, Part orientation, Art

2 Centre de Recherche Technologique CIRTES 29 bis, rue d ’Hellieule 88100 Saint-Dié-des-Vosges FRANCE Tél (33) 03 29 55 11 71 Fax (33) 03 29 55 10 45 e-mail : info@cirtes.fr Web : www.cirtes.fr Antenne CIRTES - Carmaux : ISTM 53bis, avenue Bouloc Torcatis 81400 Carmaux Tél : 33.(0)5.63.76.72.41 Fax : 33.(0)5.63.36.30.64 E-mail : cirtes-carmaux@cirtes.fr CIRTES European Centre for Rapid Prototyping

3 Centre de Recherche Technologique Stratoconception ® process Principle

4 Centre de Recherche Technologique Part orientation in RP Generalities Z-axis deviation « Staircase effect » Part compaction Specific characteristics of the process Influence of part orientation in RP:

5 Centre de Recherche Technologique Part orientation in RP Stratoconception ® Cutting optimizations Assembly simplification Undercutting minimization Specific objectives of Stratoconception ® in part orientation: In Stratoconception ®, part orientation is determined by the direction of stratification

6 Centre de Recherche Technologique Undercutting Solutions Two-sidded cuttingStratification repartition Part orientation

7 Centre de Recherche Technologique Art vs Mechanical parts Shapes - Finding a direction of stratification Artistic part: no elementary shape, no obvious direction. Mechanical part: planes, holes, cylinders, cones…

8 Centre de Recherche Technologique Art vs Mechanical parts Subjective criteria

9 Centre de Recherche Technologique Art vs Mechanical parts Subjective criteria Shadow volumes generated by a human choice of axis Shadow volumes generated by an automatic choice of axis

10 Centre de Recherche Technologique Art vs Mechanical parts Finishing

11 Centre de Recherche Technologique Choosing a direction of stratification Surface orientation & reflection line Green = upside facets Red = downside facets Yellow = reflection line

12 Centre de Recherche Technologique Choosing a direction of stratification Z-buffer Z-buffer principle

13 Centre de Recherche Technologique Choosing a direction of stratification Shadow volumes quantification The sum of Z-buffer’s values gives the volume of the STL and its shadow As the volume of a STL is easy to calculate, shadow volume (or undercutting in our case) is known

14 Centre de Recherche Technologique Choosing a direction of stratification Shadow volumes quantification Advantages Z-buffer can be quickly calculate by graphic accelerator (GPU) Shadow’s complexity doesn’t matter Disadvantages Approximation due to the buffer (precision depends on the resolution)

15 Centre de Recherche Technologique Choosing a direction of stratification Shadow volumes visualisation From a Z-buffer to a surface Exemple: bunny’s leg

16 Centre de Recherche Technologique Choosing a direction of stratification Shadow volumes visualisation

17 Centre de Recherche Technologique The search for a direction of stratification Minimizing the shadow volumes An iterative method to find the direction wich minimize shadow volumes 1.Choose a direction W 2.Calculate shadow volumes for a set of directions near W 3.The direction generating the smallest shadow volume becomes W 4.Go to step 2, directions of the new set must be closest to W than the previous ones

18 Centre de Recherche Technologique Examples Stanford bunny Axis (human choice) Z-axis Shadow volumes=0.236% Axis (automatic search) X=0.351 Y=0.441 Z=0.826 Shadow volumes=0.094% Automatic axis is better than human’s one Human choice is, in most cases, limited to X,Y or Z axis

19 Centre de Recherche Technologique Examples The bust of Jules Ferry Axis (human choice) X-axis Shadow volumes=2.384% Axis (automatic search) X= -0.01 Y= 0.99 Z= 0.02 Shadow volumes=0.931% Automatic axis is THEORICALLY better than human’s one The human choice is better, due to subjective criteria

20 Centre de Recherche Technologique Examples Océane Axis (human choice) Y-axis Shadow volumes=0.294% Axis (automatic search) X= -0.11 Y=0.842 Z=0.528 Shadow volumes=0.156% Automatic axis is better than human’s one The automatic axis doesn’t correspond to a specific component

21 Centre de Recherche Technologique Examples Mechanical parts Automatic axis is worst than human one’s due to an optimized stratification Human choice of axis is a surface’s normal

22 Centre de Recherche Technologique Examples Mechanical parts Automatic axis = human one’s X, Y or Z axis

23 Centre de Recherche Technologique Future works Use an optimized stratification when searching for the best axis (for mechanical parts) Possibility to add a subjective criterion when searching for the best axis (for artistic parts)

24 Centre de Recherche Technologique Thank you for your attention


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