When is a curve not a curve (Solved)

[Paul Mudditt]

In this example I have created a letter T as a polygon. I also added a letter T and converted to curves. Why the different behaviour to the geometry - subtract operation?

geometry fail.afphoto

[JeffreyK]

I have seen this happen in other software when the two objects shapes/curves are in the same direction or in different directions when combined. Perhaps try reversing the direction of one of the two then do it again?

[Paul Mudditt]

7 minutes ago, JeffreyK said:

I have seen this happen in other software when the two objects shapes/curves are in the same direction or in different directions when combined. Perhaps try reversing the direction of one of the two then do it again?

I was sceptical of your answer but mirroring the letter T made a difference. Well done.

[Paul Mudditt]

Now having read this article

https://2dgameartguru.com/vector-orientation-understanding-a-frequent-problem/

I have a different perspective of this issue, previously I had literally flipped the letter T, now I show the solution with simply reversing the NODE ORDER using the Reverse option in the Node tool. Certainly now a handy tip for me.

[spinhead]

Very interesting (and solved the problem I came here to solve.)

I'm still curious WHY it happens. The article explains what is happening, but I'm hoping that understanding the cause will help me troubleshoot other quirks down the road.