Computational Hydrographic Printing (SIGGRAPH 2015)

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Computational Hydrographic Printing (SIGGRAPH 2015)

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[Computational Hydrographic Printing (SIGGRAPH 2015)]

[By: Yizhong Zhang, Chunji Yin, Changxi Zheng and Kun Zhou:] Source: LYBIO.net
We introduce Computational Hydrographic Printing, a new method for physically decorating 3D surfaces with user customized color textures.

Hydrographic printing is a widely used technology in mass production for transferring repeated color patterns to a 3D surface.

It uses a PVA film with printed color patterns put on top of water. Then an activator chemical is sprayed on the film, softening the color film to make easily stretchable.

Next the physical object is slowly dipped into the water through the floating film. Once touching the object the film gets stretched wraps the object’s surface and adheres there. Throughout the coloring printed on the PVA film gets transferred to the surface. The fundamental limitation of hydrographic printing is that it is almost impossible to precisely align a color pattern to the object surface because the object stretches the color film.

With complex surfaces the stretch can be severe even tear the film apart consequently color hydrogrpahic printing is limited in transferring repetitive color patterns as shown in these examples.

Our computational hydrographic printing enables precise alignment of surface textures to complex 3D surfaces.

We build a control hydrographic printing system using off-the-shelf hardware.

In this system the object to be colored is held by a gripper connected at one end of a vertically placed aluminum rod, driven by a linear motor the rod can be moved upward or downward at a constant speed.

Our 3D vision system is interfered it to measure the location and orientation of the object with respect to the color film. Our major contribution is a computational model to simulate color film distortion during the hydrographic immersion.

Our simulation model creates a texture map between the colors on the film and the surface locations where they are transferred to. We use this map to complete a color image for printing on the PVA film. After that we print the film with the conventional inkjet printer. Place it on the water and finally conduct the physical hydrographic printing.

physical object

digital model

Here we compare the digital model and the colored physical object generated using our method.
Multiple Immersions

Our method can be extended to handle complex objects by dipping the object multiple times each with the different orientation.

1st immersion

2nd immersion

3rd immersion

physical object

digital model

This is an example with three immersions. Let’s see more results.

Here is a zebra colored with two immersions.

virtual simulation

top view

bottom view

We first show the virtual simulation and then the colored result.

You can see our method generates precise alignment of surface textures to a 3D surface.

physical object

digital model

Bunny (three immersions) Source: L Y B I O . N E T

Here is a bunny with complex surface textures.

physical object

digital model

Hydrographic printing can be applied to various materials including metal, plastic and porcelain.

In this example a porcelain cup is first scanned to get its 3D model which is then textured map by an artist.

Porcelain (one immersion)

virtual simulation

top view

bottom view

Finally, the cup is colored using our method.

physical object

digital model

This is a statue object.

physical object

digital model

Globes (one immersion)

This example is a globe with an earth texture produced with a single immersion.

Thank you.

The End.

Computational Hydrographic Printing (SIGGRAPH 2015)

Computational Hydrographic Printing (SIGGRAPH 2015)

Learn more and connect with both Universities:
Technical Paper at ACM SIGGRAPH 2015
http://www.cs.columbia.edu/~cxz/publications/hydrographics.pdf

Zhejiang University
http://www.zju.edu.cn/english

Columbia University
http://www.columbia.edu

Computational Hydrographic Printing (SIGGRAPH 2015). Hydrographic printing can be applied to various materials including metal, plastic and porcelain. Complete Full Transcript, Dialogue, Remarks, Saying, Quotes, Words And Text.

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