Without old lighting, using any shader will make "big" blocks very dark in some areas

[noacubestudio]

Tried a few different shaders, this also happens in plenty Optifine versions. When a block is bigger than the 1x1x1 area, I think.

[sp614x]

The old lighting should be set to Default so the shader pack can pick the correct option.

[noacubestudio]

Default will sometimes be "off''. So it will have these weird dark areas. For every shader pack that does that, it looks like the only option is to use the old (otherwise worse?) lighting?
Since "off" is an option at all, and then this always happens regardless of whatever shader I actually try, it just didn't feel right to me. What if packs do use the "off" option?

[noacubestudio]

Looks like it's also related to the Smooth Lighting level, which makes sense. (0 = it looks fine)

[sp614x]

OFF means that the user wants the old lighting to be OFF.
Default means that the shader pack can decide ON/OFF depending on how it works.

[noacubestudio]

Yes, I was just wondering why the 'new' lighting always has this problem regardless of the shader.