i'm mod author. i won't be guessing why only one portrait is used through the game, but it's easy to guess why mouth covered - because it can hide any expression, be any expression, letting players decide for themselves maybe which face Luka is making at given circumstances.I noticed that the mod doesn't use Luka's last two expressions, (ruka_fc2, 3) and (ruka_fc2, 4).
You said that it's possible to customize them, the problem is that I have no idea how to do it, even after looking at the file.
Who is the author of the mod? Tiny? Would it be possible for them to update it to include those last two expressions?
One thing I wonder is why this needs a mod and the devs haven't added these expressions for Luka. I remember that Ilias, Alice and other characters have several expression changes while Luka only keeps the same one (and it had to be the version that covers his mouth, why?)
Anyways, the mod. It's possible to use those last two expressions, but the way game and the mod is structured, it can be done only for "periods of time" from and to a variable changes. Meaning - one dialogue can't have Luka making multiple faces. Rather, he can only have a face during some period of the plot for example, OR as direct replacement for the whole time.
Let's see: with mod Luka uses (ruka_fc2, 1) for quite some time, when variable 1001 changes during plot points of Part 1 from 0 upwards to 19. Technically it's possible to add usage of (ruka_fc2, 4) for let's say when Luka&co enter Iliasburg for the first time, when variable 1001 changes its value to 9.
here, i quickly whipped up this. modified mod in attached zip file. View attachment Mask_of_Envy.zip
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Basically, player either needs to know when they want portrait changed to make such chanegs. OR all those gradual entries can be scratched and just one replacement portrait used for the whole game with one entry in each `portraits` and `graphics` arrays.
Could it be done better? Dunno, maybe. But main reason for the mod was the fact that Luka uses one singular portrait for the whole long game. And because of that there's nothing to hook on in dialogues, no other expressions of his to replace, it always same portrait with same index that gets used, and could be replaced only with one portrait with one index. That's why i hook on some under-the-hood variables (and because i don't have better ideas hah).