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Blender vs Papercraft

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alfith

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In this post, I will give some tips I learned when I did the papercraft harvester for my son using Blender (see https://www.gamedev.net/blog/635/entry-2255522-rock-paper-scissors-but-with-a-blender-instead-of-a-rock/)

step0.png

1. The model.
I did it simple for a first try using many individual parts all in the same object. I split the geometry in separated parts to get a more rigid result. The other option was to create an armature hidden inside the model but it could have been tricky and it can be difficult to print.
step1.png

2. Prepare the unwrap
Select edges that will be cut and use the "mark seams" feature.
step2.png

To get a correct unwrap, edges that has to be folded must be aligned. If they are not, a cut must be made.
Here, the cyan edges are to be folded but they are not aligned.
step21.png

If you do not mark a cut here, you get this unwrap
step22.png

As you can see, the shaded face is no more a square. The model will not be correct.

The selection of the edges to cut can be difficult.
step23.png

It is sometimes easier to completely separate a bunch of faces from the rest of the model.

3. The unwrap
In step 1, I said to use only one object made of several parts. It is needed (as far as I know) because you probably want all your pieces to share the same scale. Using only one object, you can unwrap the whole model at once and get perfectly scaled parts.
step3.png

Do not forget to set the "margin" parameter to an adequate value to get room to cut the flaps.

I then exported the UV layout as an SVG file so I can create the paper model the size I want in Gimp. The harvester is an image of 11400x11400, but it is a bit too much, the final print was made on 6 A4 pieces of paper.

I thinks that's all. Try this at home !

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Ah, you know, now that I think about it I think it was the fact that my parts were separate objects that was biting me in the ass. Thanks for the workflow. :D
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I love the idea of papercraft models, maybe someone could write a program for printing 3d models into papercraft format, and vice versa.
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[quote name='CatmanFS' timestamp='1355295048']
I love the idea of papercraft models, maybe someone could write a program for printing 3d models into papercraft format, and vice versa.
[/quote]
There's a program out there already that does this, it's called Pepakura Designer. It allows a user to import a 3d model of various formats and then unfolds it and generates tabs and edge numbers to aid in construction.
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