Aside from measuring the angle and then making a new line at one third of the angle (plus whatever angle the line is already at), there aren't any tools in ORIPA that allow you to do it precisely.Baltorigamist wrote:I just use ORIPA and take a screencap of the finished CP. But it gets annoying when I need a certain angle (trisection, etc.) that the software just doesn't do.
On that note, does anyone know how to make a trisector in ORIPA?
You can always do the infinite bisection technique. A few iterations should be accurate enough for a screencap. Getting ORIPA to fold a CP might need more precise, but given that the angles are rounded to 3 decimal places, 10 bisections should give you about the same error (based on dealing with whole values for the angles).
1. Bisect the angle you want trisected (gives you 1/2)
2. Bisect that angle (gives you 3/4)
3. Delete the previous bisection
4. Bisect the largest angle (5/8)
5. Repeat steps 3-4
Doing this ten times will give you 0.666992187 of the original angle. Round to 3d.p. gives you 0.667, which is 2/3.
For a 600mm (60cm / 24") square, that equates to an error of 0.6 mm (0.023").
You half the amount of error every iteration, so you can do more or fewer depending on how precise you need to be.
! We posted at the same time falcifier! That is why mine made no sense! (Or much)