Inventing Models

[Harpseal]

Generally, i start with a shape in mind, then i think of what base i know is close to that shape, or how i can edit that base to get close. Then i try it out, see how close i am, get closer, maybe finish it if it's basic, but if not, i make it again, and get closer still. Never before have i had to make something a third time, i normally have it by the second, but that's probably just me.

[dragon]

Can anyone tell me how to create models using the 22.5 degree method, without just putting together tons of bird base-like sets of creases, e.g. Robert Lang's sea urchin.

[Baltorigamist]

For that, experiment with point-splitting and 67.5-67.5-45 triangles. I'd also recommend studying some of Satoshi Kamiya's crease patterns (e.g., Unicorn, Murex) and see how the creases and structures line up.
(Others' CPs, too, of course--SK was simply the first that came to mind.)

[Harpseal]

What's the 22.5 degree method?

[cowburger13]

I'm also a little confused on the technique. Here is one of my designs that uses 22.5 angles
Black pine sawyer beetle cp

I would start designing using traditional bases

[Harpseal]

Er, sorry, but you still haven't said what it is....

[Falcifer]

What's the 22.5 degree method?

Hopefully, someone will correct me if I'm wrong, but just like box-pleating relies on a grid and its diagonals, the "22.5 degree method" relies on creases made at 22.5 degrees (and its multiples- 45, 67.5, 90, etc.)

It's much easier to find creases which are based on those angles, just like it's easy to find those located on a grid, so constraining yourself to those angles can make the folding of such models easier. It probably helps with finding a folding sequence, too.

However, it is a constraint. It's not a bad place to start, though; the bird base (and other established bases) can be incorporated into designs. I would say it probably puts a limit on flap lengths and shapes.

I need help with something design-wise, though: how do you transfer irregular pleats (1:sqrt2) to standard BP?

If you could give an example, I would try to help. Though, I should warn you that I only have a moderate understanding of the theory of design. No real experience with the practical side of things.

[Baltorigamist]

The issue lies, obviously, in the fact that the amount of "eaten" paper isn't integral ((sqrt2 - 1) x the number of pleats elevation-wise compared to 0 with regular pleats). If I could transfer the irregular pleats into 2:1, they would Elias-stretch nicely a la Ryujin.

one of my designs that uses 22.5 angles

I found a few errors in the CP, actually:
In the central triangle in the bottom, the creases emanating from the center and (?)hind legs should bisect the angles, and they look to be at about 1/3.
And the triangle molecules on the sides (top corners)--the axial crease from the center stops at the centroid and continues perpendicular to the edge.

Looks like an interesting desgin though.

[Falcifer]

The issue lies, obviously, in the fact that the amount of "eaten" paper isn't integral ((sqrt2 - 1) x the number of pleats elevation-wise compared to 0 with regular pleats). If I could transfer the irregular pleats into 2:1, they would Elias-stretch nicely a la Ryujin.

Unfortunately, I am still struggling to visualise the problem.

If I understand it correctly, the problem is that the "irregular pleats" form flaps which don't line up with the box-pleated flaps. You want them to be the same height (which can be done with sinking) and the same angle (i.e. straight).

I'm not familiar enough to know the details, but I would think that you probably need to alter some of the irregular molecules for box-pleated ones.

[Harpseal]

Thanks, i got what you meant, i may encorporate it into my latest design- the silver surfer, i think i accidentally did without knowing what it was in my latest drafted creation hati eats the moon, and i'm not sure about Anubis. (The silver surfer is in pre-production while i work on iron man)

[Baltorigamist]

Unfortunately, I am still struggling to visualise the problem.

If I understand it correctly, the problem is that the "irregular pleats" form flaps which don't line up with the box-pleated flaps. You want them to be the same height (which can be done with sinking) and the same angle (i.e. straight).

I'm not familiar enough to know the details, but I would think that you probably need to alter some of the irregular molecules for box-pleated ones.

That would work, but I'd probably need to revise the structure I'm working with.
I'm trying to use a structure that allows dorsal spines (e.g., on a dragon) along the line of symmetry. Basically it's an assortment of rabbit-ears in 45-45-90 triangles. The problem is that the outermost molecules create pleats that shift the edge of the square, and there's no efficient way to straighten it out.
I may need to just shelve this one and maybe come back to it later.

Anyway, earlier this week, a friend of mine told me it would be cool if I could do an origami Sonic The Hedgehog. Something possessed me to actually try it, and I managed to get a passable representation on my first try. (I even got all 9 spines and all the facial features, plus color-changed muzzle, chest, and gloves.)

[Harpseal]

Wow! Can i see sonic? It sounds awesome!

[Baltorigamist]

The design isn't complete by any means; I've only done two test-folds with copy paper. But I'll post pics when I get a good result.

[Argonaut]

I first learned how to design using box-pleating, and honestly, using the circle packing/treemaker approach seems far more difficult to me. box-pleating will get you what you want a lot easier, if being slightly less efficient. I am trying to get better at circle/river packing, but I find it far trickier, so try both methods, and see what you like the best.

For more info about designing with box pleating check out the blog called "Power Word Fold"; it was through that blog that I learned how to design.

[cowburger13]

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