What's up with the renderers?

[Griffonki]

I play GZDoom on hardware rendering, I tried truecolor software and doom classic thingy and I admit, it looks better but it makes looking up and down streches and twists the screen in a really jarring way and gives me a headache, is that how it works (not supporting looking up and down) or did I mess something up? 

[esselfortium]

That’s how it works. Doom renderer isn’t capable of perspective-correct freelook.

[indigotyrian]

This is due to how the software renderer draws the scene. For more info check this out: https://zdoom.org/wiki/Y-shearing

[Sesamia]

I've previously used the following guide to make hardware rendering look more like software rendering in GZDoom.  It might be useful for you too.
 

 

[Griffonki]

35 minutes ago, esselfortium said:

That’s how it works. Doom renderer isn’t capable of perspective-correct freelook.

Ooh alright. Thanks lads, I'll stick to hardware rendering then with I think doom legacy filter or whatever it's called so dark areas stay dark, works well with beautiful doom, hope that's ok.