3D Models from Warped Images

Jennifer Weiler
__________________________________________________

This is a continuation of
CRAFTING COLORFUL OBJECTS: A DIY METHOD FOR ADDING SURFACE DETAIL TO 3D PRINTS
in which images are distorted, printed, and applied to 3D prints as a means
to give 3D models greater surface detial. In this project, we expand on this by
creating a program that can generate complex 3D forms (not just the radially
symmetrical ones of the previous work), and we focus on creating objects out of
the printed images without the use of an underlying 3D print support structure.

Proof of Concept: Distorted Image

In order to form cut-out images into any shape, we felt that the easiest approach would be to divide the image into individual strips that could be morphed, printed out, and then assembled into the form. In order to test this approach, we created a distortion of a half-sphere from paper.

below: cut warped strips (left) and original image (right)



below: warped strips assembled to create complete image with bulging sphere underneath



Processing Program for Generating Models

To generate the models that the images are shaped to fit, we created a
Processing program that can be used to design simple models that can be directly translated into cut-out strips. Currently, models are limited in shape and detail,
but we are interested making a more expansive proogram or
finding an efficient means to use preexisting 3D models.

below: view controls
models may be viewed in either wireframe or solid version,
and in either straightline or curve version



below: alter controls.
Users can control the location and angle of each point ring,
the position of individual points, and the length of the arcs between points.




Paper Test

Using a flower pattern as a test image, we created a paper version of
one of the 3D model designs. In addition to the printed paper designs, the program also exports .svg shapes of the paper strips so that the images could be cut out using a laser cutter. However, for this test, we cut then with scissors.

below: paper strips printed on paper, cut and organized, and assembled into 3D model



The Processing program can also export a flattened representation of the 3D model. By drawing on top of this template (such as in Photoshop or another image editor) and using that image for the source image when producing the colored strips, the user can be sure that they know how the image will be deformed in the finished model.

below: image files exported from program showing 2D maps of the 3D models.


below: using Photoshop, designs were added to the original map.
These images will be loaded into the program and used for designs on the exported image strips



Fabric Test

We had the image strips printed on fabric using a commerical service, but it could also be done using screenprinting depending on the simplicity of the design. The fabric strips were assembled (one with needle and thread and the other with fabric glue) and stuffed. Without the need for the underlying 3D print support structure, the finished objects could be much bigger than what is available with most affordable 3D printers.

below: image strips printed on cotten fabric (printed using Spoonflower)


below: sowing process for creating fabric dog model.
Future versions of the program should seek to merge sections and reduce the number of
individual strips as much as possible (to reduce sowing / general assembly time).



below: assembled dog model


The cat model was assembled with the use of fabric glue.
While fabric glue can be much quicker and more effective when attaching flat areas
of fabric, we found the assembly of this model with fabric glue to be very difficult
and required the fabric to be held in place until the glue was at least partially dry.

below: assembled cat model