System Information
Windows 10 64 bit Home
Blender Version
2.77a
Short description of error
Coincident planes with FreeStyle lines don't detect or render properly
via the Visibility condition for animation or image render.
This can occur via Freestyle Edges or Freestyle Faces.
This seems to be an issue inside Blender, irrespective
of the render engine.
Exact steps for others to reproduce the error
Have one smaller plane precisely located on another larger one.
Both have the identical material reference to prevent z-fighting.
There are no textures or images on the planes.
It isn't always possible to have 1 smallest unit offset between planes,
if for example one wants to do an origami simulation
with all paper folds accumulating to a virtual, zero thickness.
This issue can also prevent itself when animating
between various such states using Key Frames,
maybe involving the AnimAll plugin.
Examples include frames 400, 670, 560-580.
