ericw dropped by on IRC with these. Top one is AguirRe’s q1bsp light tool with sunlight2 feature, bottom one is the new work in progress sunlight2 in ericw’s version of Tyrann’s light tool.
This is the coolest thing I’ve seen in Quake 1 development for a while, ever since… er… ericw’s own ambient occlusion feature.
Notice (a lot) more detail in the shadows, softer shadows due to sunlight penumbra and slightly brighter outdoors. Pretty amazing improvement. This is without AO, even. I love it!
The map is an older version of RMQ e1m2.