ZDoom

I've tested the latest GZDoom (3.2.0) and capped skies still don't work in Heretic and Hexen with the classic renderer (both truecolor and paletted modes), moreover stretched and normal skies don't work properly either. The sky is tiled (when you look up you see the bottom of the sky).

Late response to this, It would appear at some point the view angle clamping was changed so that you can now look up as much as you can look down. Tall skies still start from their old position though, and I presume the goal here was to do the sky cap thing on tall skies, but it doesn't work properly. The fade effect works until you look up past the top of the tall sky, breaking the effect and causing it to tile. This does not happen with short skies. Stretch also stretches to the old point, and I'm honestly questioning the choice to change the upper pitch limit since unlike before there's nothing anyone can do about the sky tiling, except for using the capped sky feature or making all their skies tile, since moving the start point for tall skies up would break any wad out there using tall skies. meh

The new pitch limit is the same as what Skulltag/Zandronum uses - and it makes freelook a *lot* more usable in the Software renderer. The old limit was way too constricting - nevertheless, just like with Skulltag/Zandronum you can use "cl_oldfreelooklimit" to put the old limits back in.

can we have a mapinfo flag that makes skies start at the new start point, then? I'd like to be able to make use of all of that space for skies if at all possible.

you can kind of work around it by padding the bottom with what should go above the top of the sky texture but that's an ugly hack, and once the capped sky bug is fixed that won't be useful for those using capped skies anymore. That should probably be fixed, an imgur album demonstrating the problem.

This problem occurs as well for those who are using tall skies under Doom - even more so. Can easily be tested with the wad provided from here.