Hi, I am new to Seamly 2D. Thank you for accepting me into the forum.
I have a little problem here. After I made my patterns and pieces, as I try to layout, a “Couldn’t prepare data for creation layout” message popped out. Why did that happen? How do I make it work?
Here is my file. shirt_dress.sm2d (62.0 KB)
@Janae_Hung quote=“Janae_Hung, post:1, topic:14697”] I have a little problem here. After I made my patterns and pieces, as I try to layout, a “Couldn’t prepare data for creation layout” message popped out. Why did that happen? How do I make it work? [/quote]
Welcome @Janae_Hung
Often when this happens it’s because there’s something wrong with a curve’s control point(s) or a control point is at an angle that causes an error in calculating the layout piece’s seam allowance path.
What I did is selected each piece one at a time and generated a new layout to find which piece was causing the error. Of course in this case it was the last piece in the list. - the Yoke. 
Use the New layout tool to create a new layout:
Once I found that it was the yoke causing the error I went back to Draft mode to see what may be the issue. One issue I found - which actually fixed the layout issue in the process - is that normally when you create a curve you want the start and end point control point angles to be perpendicular to the seam. In this the 1st control point for the Spl_B10_B14 should be perpendicualr to the Line_B4_B10. This will create smoother courves and no kinks across a seam.
So I added the formula to the CP1 angle:
So now the control point is perpendiculatr toLine_B4_B10:
Just changing the angle was enough to fix the layout issue:
shirt_dress_fixed.sm2d (55.9 KB)
BTW. In the future please include any measurement file to make it easier for us to look at a pattern.
Also I suggest reading some of the topics on creating curves, and how to formulize the control points for smoother curves - especially for resizing patterns. For ex: I noticed the control points for the bottom corner curve on the front… where you want the CP angles to match the angle of the lines they blend into for a smooth transition:
This will cause kinks:
This will not.
Thank you so much. I checked and checked and couldn’t find the problem. So, it’s the angle of the start and end of a curve. This is the first time I had a problem like this. I now know how to fix it. Thanks again.
Yes. Often times when there an issue with pattern pieces or in this case the layout pieces it’s related to the curve control points. It’s why I always check the control points when there’s an iisue. For ex a common mistake is when a control point get’s flipped 180 deg…
This is fine:
This is not as the CP is flipped and is causing a loop:
In the case of your pattern and the layout it was math related, because we’re dealing with real numbers there’s rounding error. That’s where nudging the length or angle of a control point can be enough to fix the issue.
I have a lot of the cut-cornered seam allowance. I just thought it’s probably meant to be like that. Now, it makes more sense to me . CP is very important in trouble shooting. I will pay more attention next time. Thank you.
