Blender Git Loki

GPencil: Per-layer option to always show onion skinning

Sometimes it can be useful to be able to keep onion skins visible in the
OpenGL renders and/or when doing animation playback. In particular, there
are two use cases where this is quite useful:
1) For creating a cheap motion-blur effect, especially when the before/after
values are also animated.
2) If you've animated a shot with onion skinning enabled, the poses may end
up looking odd if the ghosts are not shown (as you may have been accounting
for the ghosts when making the compositions).

This option can be found as the small "camera" toggle between the "Use Onion Skinning"
and "Use Custom Colors" options.