I have a simple, unsubdivided plane mesh with a particle system that I want to apply Cell Fracture on, following this step-by-step guide: http://blendersushi.blogspot.de/2012/07/vfx-voronoi-cage.html
But I'm stuck at the part where the author writes
For the purpose of creating Voronoi Cage, I actually just need the "wireframe edges", so I join the Shards back into a single mesh (CTRL+J).
, since there is nothing to join.
Selecting the original mesh named "Plane" and hitting Ctrl+J yields "No mesh data to join", while selecting any of the new "Plane_cell*" meshes and hitting Ctrl+J does nothing, not even displaying some error message.
I'm certain that I'm missing something crucial, but I can't figure out what.
(Sorry for the uninspired tag choices, no other tags looked appropriate.)