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I'm trying to create a bent grid in Inkscape using interpolate like in this tutorial. However, when I follow this instruction word for word, my interpolation looks like this:

enter image description here

How do I make sure it interpolates as it does in the tutorial?

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Your start and end curves have different directions. You must draw them both for example from up to down.

If you have a trajectory, its direction also affects the result, but this problem is caused by the different directions of the start and end curves. If they happen already be drawn otherwise perfectly, you can remove the effect, break apart the combination path and reverse one of the paths (Path > Reverse)

Here's an example what is caused by the different directions. Someone can also want this. It's fixed in the right image.

enter image description here

BTW. The horizontal curve in the middle is the used trajectory.

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  1. Make two paths like this, ensuring they run in the same direction, select both paths then click Path > Combine

enter image description here

  1. Click Path > Path Effects, to open the Path Effects dialog.
  2. Click the Plus icon, and select Interpolate Sub Paths.
  3. Choose the number of steps required.
  4. Click on the Edit on Canvas icon.

You can now edit the trajectory path using the Edit Paths by Nodes tool

enter image description here

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