> It takes a lot of work to make a usable UI out of triangles, so most applications did not go this path. One big exception was games, which were already heavy

> It takes a lot of work to make a usable UI out of triangles, so most applications did not go this path. One big exception was games, which were already heavy GPU users, and usually had minimal UIs. The 3D renderer Blender is another example. Only briefly, but seems covered to me. Edit: now I get it — they mention games, but not game engines as a means of creating other applications.