This allows line art to run only once for each modifier stacks,
with an option to toggle a specific line art modifier should
use cache or re-do their own calculations.
Reviewed By: Sebastian Parborg (zeddb), Hans Goudey (HooglyBoogly)
Differential Revision: https://developer.blender.org/D11291
This adds the LineArt grease pencil modifier.
It takes objects or collections as input and generates various grease
pencil lines from these objects with the help of the active scene
camera. For example it can generate contour lines, intersection lines
and crease lines to name a few.
This is really useful as artists can then use 3D meshes to automatically
generate grease pencil lines for characters, enviroments or other
visualization purposes.
These lines can then be baked and edited as regular grease pencil lines.
Reviewed By: Sebastian Parborg, Antonio Vazquez, Matias Mendiola
Differential Revision: http://developer.blender.org/D8758
