Sorry to revive this "old" thread but what about maps already made in Radiant? I have been working on one map for nearly two years and another for a few months now and I thought to build and optimize these maps for HD. All of the textures are normal (and some bump) mapped with high resolution diffuse textures, thousands of brushes are to achieve a good looking map, a lot of cube maps are put in for best specularity and also a somehow well thought-out light concept (based on Frankie's painting with light video) is made for the final touch.
Will there be differences between maps made in Radiant and maps made in 3d modeling programs? Is the performance different? I am a little bit confused by contradictory statements about this topic and I would like to hear your opinion about it. Is it a bad idea to think these maps will get played in future versions of HD? Don't get me wrong: it's just about the maps on that people have been working on for a long time and don't want to trash.
The only thing I noticed so far is the bad lighting. It's not possible to get such nice shadows as shown by Rayne in his shadow baking technique (viewtopic.php?f=16&t=362