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Jun Mitani University of Tsukuba, Japan 2013.8.12 ACDDE2013
Jun MitaniUniversity of Tsukuba, Japan
2013.8.12 ACDDE2013
Digital fabrication
１． Interactive design systems
2. Computational Origami
An object on a screen appeared in the real-world.
with Hiromasa Suzuki
Artists design.
Consumers buy kits.
Inexpensive equipments
New software (2002)
Past days
Consumers design by themselves.
Today
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Prof. Takeo Igarashi
Teddy 1999
We want to design and make things by ourselves. The price of hardware has been dramatically decreasing. FabLabs, small fabrication laboratories, are widely spread. We now have infrastructures of hardware.
http://www.northampton.edu/northampton-now/southside-debuts-new-fab-lab-at-open-house.htmNeil Gershenfeld 2005
Help people fabricating personal objects by the technology of software.
Provide computer aided design systems with which non-specialists can design objects intuitively and interactively.
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Interactive design
1. High-speedphysical simulation 3. New Devices2. Constraint / Optimization
solver
with N. Umetani, K. Takayama, and T. Igarashi
Project 1/3
Real-time Eigenanalysis with high-speed FEM Continuously presents a predicted tone. Physical simulation gives users real-time feedback.
1. High-speedphysical simulation
User draws objects on a single photo A 3D structure is automatically generated based on user specified constraints.
with M. Lau, G. Saul, T. Igarashi
2. Constraint / Optimization solverProject 2/3
Design with a body-sized physical mannequin
with A. Wibowo, D. Sakamoto, T. Igarashi
3. New DevicesProject 3/3
Interactive design
1. High-speedphysical
simulation
3. New Devices
2. Constraint / Optimization solver
According to the intervention of the computer.
Computers 1. Present status (Error? or OK?)
2. Give a fix to the user’s design
3. Present candidate designs
4. Provide a closed design tool
5. Generate optimal design
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Intervention of the computer
High
Low
Flexibility
High
Low
24with N. Umetani, K. Takayama, and T. Igarashi
The system presents the status of the designed model. E.g. Shows [OK / NG]
By adopting a high-speed physical simulation, the user can see the status in real-time.
The user can try a lot of designs in interactive manner.
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with N. Tsuruta, Y. Kanamori, and Y. FukuiACDDE2012
The user designs. The system fixes the design so that the shape satisfies geometrical / physical constraints by using optimization approaches.
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warning
alternate candidates
Guided Exploration of Physically Valid Shapes for Furniture Design[ Umetani et al. 2012 ]
The system provides alternate candidates. When the user’s design has issues. When it is difficult to find how the issues should be solved.
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Demo
The system provides only limited design interfaces. The use’s design always satisfies the constraints.
Pop-up card design tool [Mitani 2004]
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http://www.ce.jhu.edu/jguest/TopOptProgram/
Topology optimization
The user inputs constraints. The system automatically generates the optimal shape which satisfies the constraints.
Summary:
Traditional origami Recent origami
http://www.folders.jp/
“Rhombus Waterbomb / Flagstone Tessellation”Eric Gjerde, 2006
秘伝千羽鶴 折形 1797
The crease pattern defines the folded shape.
A crease pattern appears when an origami is unfolded.
There are several design tools.
http://www.papermosaics.co.uk/software.html
Tess by Alex Bateman Tree Maker by Robert J. Langhttp://www.langorigami.com/treemaker.htm
Make a curved origami, e.g. a sphere!
How can I do?
Parametric surfaces
Ruled surfaces Developable surfaces
Square to sphere mapping!
Unfold Fill gaps
Add flaps
SurfaceGap = Flaps
Demo
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1. Present status
2. Give a fix to the user’s design
3. Present candidates
4. Provide a closed design tool
5. Fully automatedHigh
Low
Intervention of the computer
Jun Mitani origami Search
1. I introduced a number of projects for helping people designing and fabricating personal objects.
2. I categorized them from two different view points.
3. I proposed a matrix to clarifies the characteristics of the interactive design systems.
4. Not only the infrastructure of hardware but also the software technology is necessary for helping people design objects.
5. Origami is close to our daily life, and can be a interesting target of digital fabrication.
