Jun Mitani University of Tsukuba,...

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.

Thank you for your attention!

Jun MITANImitani@cs.tsukuba.ac.jp