They are on Graphisoft's site.
To go straight there, open AC10, and under the help menu there is a direct link to the AC10 Goodies of which mesh to roof is just one.
Download one or all and install in the add-ons folder.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"