MetHy, on 22 August 2019 - 06:08 AM, said:
In short, on the mapping side, 129 (screen) was mostly used for gradients, lights or similar effect (the "fog" effect on the walls in z1a4; or used in combination with paletted sectors like coloured lights or nukage); and 130 (multiply) for sprite shadows and to make tainted windows.
The AMC TC uses 255 addtiive blending for gradients, lights etc, although we weren't really aware of the screen. I thought all the gradients were additive. Clearly there's a very wide degree of similarity and overlap between the two. Hopefully someone can provide some kind of disambiguation to settle my intellectual curiosity and OCD
MetHy, on 22 August 2019 - 06:08 AM, said:
Is there some advantage to this compared to making sprites invisible the regular way (' + i) ?