Glyphs-Handbook-2013

Tip: Quickly switch between
masters with Cmd-1, Cmd-2, etc.
means that the order of the paths as well as number and
structure of nodes must correspond with each other.
View > Show Master Compatibility (Ctrl-Cmd-Opt-N) activates
a visualization of the masters’ congruency. The red lines
connect the corresponding nodes in all masters. If the picture
looks as wild as in the first sample picture, then something is
fundamentally wrong. The three slightly bigger red numbers
indicate the paths’ starting points and the path order. Straight
blue lines connect the starting points of all masters. When
comparing outlines, you always start at the start node of the
paths and follow them in the direction that is indicated by the
small triangle at the first node.
The colored segments indicate the compatibility of the
segments. Red means that there is a line in one master and
a curve in the other. These masters will not interpolate at
all. Yellow means that the paths are of the same type but
have a dierent angle. They will interpolate but may yield
an unexpected result: dierences in angles can turn smooth
connections into so-called ‘kinks’, i.e., corners. Green segments
are fully compatible.
Example:
In the foreground you see the colored light master and in
background the bold master’s paths, displayed in light grey.
The foreground has an overlap, while the background has
none. Choose Filter > Remove Overlap to get the second picture.
The outlines seem to fit now, i.e., they have the same
number of nodes. The blue lines connecting the starting
points in all masters are running across the letter though.
The starting nodes have to be at the same position. Either
Glyphs Handbook, May 2013 75