@Jeff: That option is already there
@CapT: Your plane screenshot made me laugh
@Xylem: Thanks for sharing the screenshots, looks good!
@Alberto: I think Hammer uses OpenGL 1.0. It might support other renderers too for really old hardware, I'm not sure. I'm actually pretty sure that in Hammer 3, all the 2D views are drawn in Windows, and OpenGL is only used for 3D mode. That's why the 2D views in Hammer are so slow when you zoom out in a complex map (no hardware acceleration).
Thanks for the bug reports and comments everyone, I'll add the bugs into the list to be fixed! I have a lot of work to do and I'm also busy with other stuff, so please be patient -_-
Recently I've been working on trying to get an old OpenGL renderer working so people on older hardware like Alberto can use it
Right now I have an OpenGL 1 renderer that seems to work, I haven't fully tested it yet and it's not tested on OpenGL 1 hardware yet. It's slow though, not much I can do about that because I don't know enough about graphics programming to fix it