Strange Interpolation

FranciscoTorres · February 20, 2018, 3:16pm

I think the interpolation is not working properly to me (but i’m not sure). At least I’m getting strange results on my instances.

I’m using 2.5 (1116)

FranciscoTorres · February 20, 2018, 5:24pm

Generated instance:

Any help, why is this happening?

Tosche · February 20, 2018, 6:39pm

This is called kinks. Even when the nodes are theoretically compatible, diagonal handles do not transition at the same pace that they can break. See this tutorial: https://glyphsapp.com/tutorials/multiple-masters-part-2-keeping-your-outlines-compatible

FranciscoTorres · February 20, 2018, 10:23pm

Thanks @Tosche

mekkablue · February 21, 2018, 12:43am

Take a look at @RafalBuchner‘s recent tweets, he has been dealing with this exact issue:
https://twitter.com/RafalBuchner/status/965232476259004417

Tosche · February 21, 2018, 12:46am

And I have a plugin in the works

mekkablue · February 21, 2018, 8:08am

Ha, me too. in my case, an extension to the angled handles plug-in.

GeorgSeifert · February 21, 2018, 2:00pm

That looks “correct”. Interpolating diagonal like this is tricky. You need overlap:

rapazote · February 22, 2018, 12:58pm

The kinks look like inktraps!
Or tampered tampered corners!

GeorgSeifert · February 22, 2018, 3:12pm

Getting the inktraps to interpolate correctly is a bit tricky

mekkablue · February 23, 2018, 7:33am

My first reaction was, ‘what’s wrong, the Z looks really cool that way’, haha.

Seriously, look into the Dekink script in my repo, what you need to do is recreate the same distance proportions between all points that need to stay in line. Consider extending into the overlap, if necessary a white overlap.

Or put the Dekink function of the RMX tools as a custom parameter in your instances.