In an 8 master, 3 axes system, if a non-aligned off-axis location is assigned as the new default, the generator than has to create a lot more masters to “keep the tent up” (@djrrb’s metaphor). 1/2pic.twitter.com/USY1c9t80a
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Rust. Fonts. Graphics. Quaker. Independent. he/him
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In an 8 master, 3 axes system, if a non-aligned off-axis location is assigned as the new default, the generator than has to create a lot more masters to “keep the tent up” (@djrrb’s metaphor). 1/2pic.twitter.com/USY1c9t80a
Great sketches! Very helpful. But ... I'm still a bit confused why it wouldn't work to just add the single, calculated master. If the 8 corners can "keep the tent up" already, why would an intepolated source disrupt that? I may just need to test it to see why
If you want that interpolated source to be the default, with current technology and math, that master needs to be on the default of all axes. Hence lots of masters to reconstruct those. But maybe I'm not understanding your question..
I think you understood my question, and I appreciate the added explaination. It is still hard for me to get *why* the default must be on all the axes in the first place. But, I probably just need to look at how the gvar table relates to the glyf table.
Attempt: the default master is the only “font” that is stored in the VF as actual, old-school outlines. Everything else is stored in the VF as deltas from the points of those default outlines.
Thanks – I do understand that it is a current limitation, but I'm just not sure why/whether it is a hard mathematical limitation. If a designspace works for a given area, why would pre-calculating one location in that area require pre-calculating any others?pic.twitter.com/O8bsa49nmy
My thinking: In a future OpenType spec, maybe there could be a "default" location in the gvar table, and other deltas would be relative to that. However, the glyf table outlines would be pre-calculated to load first / load in legacy software.
So, a better illustration of that would be this:pic.twitter.com/69LQW5IkFS
Definitely believe v1.8 has issues here
We can (re-)define the basis functions so they're zero at the default setting. Then you can change the default freely. This is one part of a proposal I have to improve interpolation, which I will publish shortly.
And by shortly I mean now :)https://github.com/OpenType/opentype-variations/issues/7 …
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