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googlefonts / science-gothic

Science Gothic, a libre variable font
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Interpolation problems (kinks) #202

Closed kateliev closed 4 years ago

kateliev commented 4 years ago

This is to serve as a placeholder and collection bin for problems that we find with the interpolation of the "finished" outlines!

kateliev commented 4 years ago

So far we know for sure that /K and /k related shapes suffer from kinks.

/K This is in both directions: CndCtr -> :Ctr SG-K-kink

and BlkExpCtr - > BlkCtr SG-K-kink-02

...but not beyond. Also interesting enough the effect is not "that" visible in /k

/k SG-k-kink-01

this whole problem will affect more or less the following glyphs: /K /k /uni0416 /uni0436 /uni043A /uni0496 /uni049A /uni04A0 /uni04C1 /uni0497 /uni049B /uni04A1 /uni04DD /uni0436.smcp /uni043A.smcp /uni0497.smcp /uni049B.smcp /uni04A1.smcp /uni045C.smcp /uni04DD.smcp /uni04C2.smcp (... and more)

kateliev commented 4 years ago

Submitting three solutions for /K to explore /K.fix_01, /K.fix_02, /K.fix_03.

For me neither works, so I am now more inclined to leave the /K unfixed - simple and more natural than having to outsmart ourselves....

Every suggestion is welcome!

servantb commented 4 years ago

I spent a while trying another fix, editing the form to reduce the difference in deltas between the offending points... and as expected it's horrific. Sacrifices any semblance of decent from for a smooth transition.

So yeah, I'm with @kateliev. We leave it and chock it up to the limitations of the technology. Can't have everything.

tphinney commented 4 years ago

I think I am in favor of an alternative: leave overlap in the /K I think the bad interpolations are bad enough that they are worth leaving overlap in. The question is, how much overlap is required? I think we could merge either the arm or the leg with the vertical and not have any problems. We just can't merge the arm and the leg with each other.

tphinney commented 4 years ago

I ended up using internal loops to fix /K Interestingly, they were not needed as far as we have noticed in /k Anyway, this is better now. If we spot more issues, can re-activate.