The Origami Forum

1) Example for the frog origami , I have not familiar with the origami with Round Circle pattern , Basically I do work on the straight line only. please give me gulideline, I think it is difficult or impossible to work on the circle line.


2) I saw some of the demonstration picture , we do pattern by using pen or pencil . should we allow to use pen with the line out. I think classically origami should be made by the plain paper only.


Example of frog pattern on this link

http://chosetec.darkclan.net/origami/fgs/

The circles in this case are not what you fold, they show how the model was designed. The circles are part of a design technique called circle / river packing. Each circle represents a flap on the finished base. Just fold the straight lines. If you are interested in learning more about this design method, just do a search for circle packing. Hope this helps!

Andrew

The rounded/circle lines are not creases, but rather an indication of the circle packing structure.

Read more about it in "Origami Design Secrets", by Dr. Robert J. Lang (I don't know any good sites about this particular subject =P).

Edit: Rdude was faster than me !

Basically I understand that we should fold the paper into retancular table
before doing any patterns. This small table will be the guidelind to create another lines . Should we apply this table to all the CP or not ?

Do you mean a grid of horizontal and vertical lines? A grid like this would only apply to box-pleated designs, and Brian Chan's frog is certainly not box-pleated. I would not use a grid for the frog, but it is necessary to make some extra creases for reference points. Even in a box-pleated design, after the initial stages of designing I would not use a grid for that-just try to fold the creases that are necessary. Hope this helps.

Agreed. Making a grid is time consuming especially if the majority of the creases don't apply to strictly horizontal, vertical, diagonal lines and also a grid can be aesthetically unpleasant. For parts of the model that don't have grid creases they show up like a sore thumb.

the equal distance between each line is always my problem. i think this problem will be slove if I use ruler in folding paper. However ,I believe that this method is not wisely universal practice. I think that 8*8 grid line can help to slove this problem for the frog too. Please give me the good suggestion for the 4 rows that is devide into 8 row at the rigth and left sidi of the paper. Please help me for my beginning.

There are lines at the top and left side of the paper that mark 8ths along the edge-those are for references. You only need to pinch a small section of the crease along the edge in most cases. For the frog, there aren't even any references that use 8ths. You only need fourths for the references. The bottom row of pleats for the toes is a strip 1/4th wide (which is divided into 6ths), the toes at the top start 1/4th along the top edge of the paper, and there are diagonals that connect those 2 points. With a little clever engineering and knowledge of point-splitting you should be able to figure out how to get the folds on the paper. And by the way, the point splitting for this frog is really really hard. I hope you're up to it

thank you very much for your reply. You mean we use the mark line over the top and the left side outside paper to calculate the distance between each line or not ?

1) I notice that the circle packin area in the paper is flexible area. that because the center of the circle will determine the center of the frog.
So the heigh of this center point can not be fixed with the accurately heigh in centimetre. Please tell me that I am right or not ?

2) Please notice at the line in left side and right side. How can we know that how many centimetre should be the line before it turn to be coner that link to the line at the right and left bottom ? Should it be flexible with my sense or it should do in fix distance of mathimetical theory.


Help me please.

First let me say that you are really hard to understand. It is clear that English is not your first language, although you seem to be doing OK. So if I misinterpret what you said, forgive me.

If by flexible area, you mean the circle is not the entire area of the flap, you are right. The circle only represents the minimum area a flap could take up. The center point of the circle is the end point of the flap it represents. The length of the flap that the circle represents is the radius of the circle.

Measuring with a ruler is not necessary to find the reference points for the frog. It is possible with only folding, and I would recommend folding and not using a ruler.

About your second question: It is confusing that you talk about distances in terms of centimeters. In origami distances are traditionally measured in terms of the edge of the paper (edge length=1 unit). All the points/fold lines are in a fixed location and are drawn to scale in the CP.

And I have a question for you: How much experience do you have folding from crease patterns?

I have experience to fold only 1 crease pattern, that is peacock. the pattern is A4 paper. start with the table line whole paper which is look similar to eric joise 's hedgehog


Distance in my meaning in how long of the line, I ask this question because some of the line example : the 8 line from the top coner of the paper . How long for each line ( the straight line that make 90 angle with the top side. )

The pleats that intersect with the top edge of the paper continue 1/4th of the way along the top edge of the paper (look at the lines above the paper-it lines up with the second mark, 2/8ths or 1/4th). That is then divided into 6ths. 1/4th divided by 6 means each fold is 1/24th away from the last.

Thank you so much . I understand now about 1/ 24. Refer to the pattern I see the height of 9 lines at the top left. How can you know how long (unit) for each line before they meet to the radius of the circle .

OK. I don't know what you mean by the 9 lines in the top left, but I have made a quick tutorial on the references for the frog. The words below each picture explain how to find the bold lines on the picture.




The lines here are all found by using the 8th markers as references. The horizontal line at the bottom is 1/4th from the bottom edge.

The diagonals are at 45 degree angles from the point where the horizontal line hits the paper edge (1/4th up from the bottom).

The two vertical lines are 1/4th from the left and right edges.

The small horizontal line intersects with both diagonals as well as being 1/4th from the top edge.



I added a vertical line down the center of the paper.

The vertical lines added in the upper left and right are in 24ths, as explained in a previous post.

The horizontal lines at the bottom also are 24ths.

The diagonals are all angle bisectors:
2 lines bisect the angles formed by the 2 large 45-degree diagonals
and the top edge of the paper.

2 lines bisect the angles formed by the 2 large 45-degree diagonals
and the 2 vertical lines that go down from the top edge.

2 lines bisect the angles formed by the 2 large 45-degree diagonals
and the center vertical line.

2 lines bisect the angles formed by the 2 large 45-degree diagonals
and the large horizontal line 1/4th up from the bottom edge.

2 lines go at 45-degree angles, bisecting the angles formed by the
center vertical line and the horizontal line 1/4th up from the bottom.




1 diagonal runs from the intersection of the large 45 degree diagonal with the left edge to the intersection of the small horizontal line 1/4th from the top and the small angle bisector that hits it. There is also one on the right side.

The other diagonal is next to the one just mentioned. This line forms the same angle with the previous diagonal that the previous diagonal forms with the large 45-degree diagonal. (If that is confusing, read it a couple more times I kept the terminology consistent).



The final five lines together hexisect (is that a word? I mean divide into 6 parts) an angle. There might be another way to find it; I'm not sure though.

Well, good luck finding the references. All I can offer now is clarification-that is how I know to find the references for the frog.