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Stanford Easter Bunny - Voronoi

by virtox, published

Stanford Easter Bunny - Voronoi by virtox Apr 19, 2014

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28980Views 10519Downloads Found in Math Art

Summary

Hi all,

I needed a cool mesh to test some true voronoi patterns.

And in the spirit of Easter;
the Stanford Bunny seemed like the perfect subject!

The cell-center distribution for the voronoi patterns was generated using charge particle simulations:
The particles can move freely within a 1mm thick voxel model of the bunny. They repel and attract each other. And over time they form a near perfect distribution across the surface.

Next, the 1mm wide voronoi pattern was generated within the same 1 mm thick voxel model, resulting in round 1mm wires.

And finally the voxel model was polygonized using a marching cubes algorithm, and cleaned using VCG lib functions.

Stanford_Bunny - Voronoi pattern stl
Is based on single charges, producing a smooth distribution and a honeycomb like pattern.

Stanford_Bunny - Voronoi2 pattern stl
Is based on sets of 2 linked charges, or lines actually. This produces slightly elongated cells. Resulting in a more more crackly pattern.

And although it is not a derivative,
hat-tip to Roman Hegglin's "Stanford Bunny Voronoi style":
http://www.thingiverse.com/thing:291323

Happy Easter everyone!

Info on the Bunny here:
http://www.gvu.gatech.edu/people/faculty/greg.turk/bunny/bunny.html
http://graphics.stanford.edu/data/3Dscanrep/

Original copyright info:
"Please be sure to acknowledge the source of the data and models you take from this repository. In each of the listings below, we have cited the source of the range data and reconstructed models. You are welcome to use the data and models for research purposes. You are also welcome to mirror or redistribute them for free. Finally, you may publish images made using these models, or the images on this web site, in a scholarly article or book - as long as credit is given to the Stanford Computer Graphics Laboratory. However, such models or images are not to be used for commercial purposes, nor should they appear in a product for sale (with the exception of scholarly journals or books), without our permission."

Instructions

Scale as needed.
Current size is 10cm
Wires are ca 1mm.

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I used Cura to slice this, but first I had Cura attempt to level the model on the print surface. Even then, it was nearly 1mm high on the Z axis. I zoomed in until my "camera" was inside the model and started lowering it (negative Z value). I think I settled on a -0.8 Z adjustment. Printed correctly after that. On the initial go, only about a 0.5" diameter spot was actually on the print surface. After adjustments I had a nice, wide area to build from and it was much more stable.

Printed in PLA with no support at 60% size and it did not go well. The poor rabbit had no face, and very fuzzy ears.

I have a lot of problems when trying to scale down on fine prints. I can only assume that's normal.

Hey :)

Love this

Im trying to do a voronoi effect on a mountain model for a friend? Any suggestions on how to do this?

Mar 11, 2017 - Modified Mar 11, 2017

I love this bunny. I printed it at ~.3mm layer height as a quick easter decoration. I filled it with a small bit of easter grass while printing. When it was 50% done, I filled it up to the 25% mark with paper easter grass. I wrapped a small amount of candy (10 m&ms) in saran wrap for food safety, and used them to hold down the easter grass. The paper grass doesn't melt and keeps the candy off of the heated printer bed. I then printed the rest of the bunny around the candy and grass. This print only uses 10g of material, so it's not much of a waste if you have to break it open to get the candy. PLA is biodegradable anyway!

Comments deleted.

how do you print this? Dissolvable supports?

I didn't use any supports at all and it was fine.

Agree. I used supports (build plate only) on the first try and because there are empty spots on the bottom, I had support "spired" coming up inside the model. Printed without supports and it worked great.

Comments deleted.

I'm not sure this can be printed as is on an extrusion printer. I've tried it with a few slicer settings, and nothing seems to work. The loops just don't seem to hold together enough to build them up. Maybe this needs a stereolithography style printer.

Do not work ... with and without support looks like the base is not parrarel to the surfafe and PLA does not sitck to the surface

when you print with all those holes in the body and stuff, 1:how long does it take, and 2: do you need to print it a special way with like supports

i've tried many times but i always get fill material inside... any suggestions?

Comments deleted.
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