I filed this issue in the wrong repo:
LettError/MutatorMath#259
Copy-pasting the original issue below.
Please follow the link above for some thoughts by @LettError.
First pointed out by @kaibernau:
An anisotropic interpolation will result in an unexpected Italic angle for the instance UFOs.
Anisotropic interpolation basically splits the x- and y- axis by allowing different factors for each.
This is how to indicate it for a given instance:
<dimension name="weight" xvalue="57" yvalue="52"/>
In the attached project, the Italic angle for both masters is -11°.
Using anisotropic interpolation, the italic angle for the instance ends up as -90°.
This is true for any value of y, including 0 and = x
I reproduced Kai’s finding using the AFDKO’s makeinstancesufo:
makeinstancesufo -ac -d designspace.designspace
# -ac switches off autohint/checkoutlinesufo
italic_angle_issue.zip
I filed this issue in the wrong repo:
LettError/MutatorMath#259
Copy-pasting the original issue below.
Please follow the link above for some thoughts by @LettError.
First pointed out by @kaibernau:
An anisotropic interpolation will result in an unexpected Italic angle for the instance UFOs.
Anisotropic interpolation basically splits the x- and y- axis by allowing different factors for each.
This is how to indicate it for a given instance:
In the attached project, the Italic angle for both masters is -11°.
Using anisotropic interpolation, the italic angle for the instance ends up as -90°.
This is true for any value of
y, including0and= xI reproduced Kai’s finding using the AFDKO’s
makeinstancesufo:italic_angle_issue.zip