To position a Reph on a MatraI

Hallo!

In Devanagari, a Reph could be (in theory) combined to a MatraI, through anchors. How does Glyphs deal with that sort of Gpos (involving Gsub too)? Does Glyphs support this way of handling the MatraI variation in combination with marks?

Thank you!

Can you give an example (sketch, screenshot) what you mean?

That is supported. You might need to use Glyphs names to get all the OpenType features. Creating a Devanagari font | Glyphs

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Is there a way to force Glyphs using the current names? Is the name modification the only option?

For clarity.

The post Creating a Devanagari font | Glyphs is not mentioning the attachment of Reph to the MatraI. It only talks about the matraI lengths, which is here not the problem.

check if Font Info > others > “Use custom names” is not checked. Then select all glyphs And do “Glyph > Update Glyph info”. that should work for all glyphs that are encoded or follow a naming scheme that Glyphs knows. In this case, it would understand “dvMatraI_reph” (that is a naming scheme that I saw being used).
If you call this glyph “iMatra_reph-deva”, Glyphs will generate the needed OpenType code for it.

Is there a way to force Glyphs using my custom names? I would really like to avoid changing the whole namings.

Glyphs need to have a mapping from your names to its names. If you have many files with that naming scheme, you can make a custom GlyphData file that provides that mapping.