ORIPA
Posted: August 24th, 2007, 5:41 am
ORIPA is awesome. That is all.
..........
So, I remembered that I had downloaded ORIPA by Jun Mitani a while back. I remember trying it out, not being able to figure it out and quitting. Today I decided to play around with it.
It's great!! It is truly made specifically for drawing (and modeling!!) origami crease patterns. The tools aren't very standard, but they are kind of nice. For instance, it took me forever to figure out how to draw the 22.5 degree angles I need. Then I discovered a tool that given three vertices draws the angle bisectors of the triangle they form--AKA the rabbit ear triangular molecule that we always use. It gives you the three bisecting creases (It's your job to determine where the hinge goes. Remember, a flat-foldable crease pattern may not have an odd number of creases intersecting except on the edge of the square.)
All right, so you can draw a crease pattern pretty quickly with ORIPA. Next, you can change the creases from mountain (solid blue, default) to valley (dashed red), and even to genderless crease (light grey). To this click change line type, and then click each crease you want to change.
Next, basically the whole point of ORIPA, click Fold… and see your crease pattern formed into the base. Well, unless you made sure to carefully obey Maekawa and Kawasaki's theorems, it will probably say you have problems, and then it will show you where the problems are. Add the necessary creases, change their orientations where needed and click Fold… again. There it is. That's hopefully what the base of your model looks like. There are some errors, where certain layers of paper appear either in front or behind where they should be, but the shape is definitely correct.
You can use this to model your crease patterns, even without folding them!
Here's a link to his website, I think, but it's not currently working: http://mitani.cs.tsukuba.ac.jp/
..........
So, I remembered that I had downloaded ORIPA by Jun Mitani a while back. I remember trying it out, not being able to figure it out and quitting. Today I decided to play around with it.
It's great!! It is truly made specifically for drawing (and modeling!!) origami crease patterns. The tools aren't very standard, but they are kind of nice. For instance, it took me forever to figure out how to draw the 22.5 degree angles I need. Then I discovered a tool that given three vertices draws the angle bisectors of the triangle they form--AKA the rabbit ear triangular molecule that we always use. It gives you the three bisecting creases (It's your job to determine where the hinge goes. Remember, a flat-foldable crease pattern may not have an odd number of creases intersecting except on the edge of the square.)
All right, so you can draw a crease pattern pretty quickly with ORIPA. Next, you can change the creases from mountain (solid blue, default) to valley (dashed red), and even to genderless crease (light grey). To this click change line type, and then click each crease you want to change.
Next, basically the whole point of ORIPA, click Fold… and see your crease pattern formed into the base. Well, unless you made sure to carefully obey Maekawa and Kawasaki's theorems, it will probably say you have problems, and then it will show you where the problems are. Add the necessary creases, change their orientations where needed and click Fold… again. There it is. That's hopefully what the base of your model looks like. There are some errors, where certain layers of paper appear either in front or behind where they should be, but the shape is definitely correct.
You can use this to model your crease patterns, even without folding them!
Here's a link to his website, I think, but it's not currently working: http://mitani.cs.tsukuba.ac.jp/
