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6) I don't recall a single game for which modders created models, textures, and animations from scratch
Mount and Blade, Jedi Academy, KotOR, the TES series, Call of Duty. You don't even have to look far—Heroes 3 HotA. And that's just what comes to mind immediately. Well, actually, I did some minor modeling for Heroes 5 myself, a gargoyle's head, for example.
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Regarding the position that "only things that didn't make it to release are valuable," I don't understand it; is this some form of "the grass was greener back then"?
Regarding the models from Heroes 6, I say again: some models from Heroes 7 are identical to those from Heroes 6—for example, the Assassins or Namtaru. You just need to take the texture from the Heroes 6 model and apply it to the Heroes 7 model. The UV map and geometry are exactly the same.
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Regarding retopology and animation editing. Basically, whatever. There's probably no point in me writing anything about this.
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they would have been better off importing the gr2 skeleton into 3ds Max and making animations since you know how to do it
That sounds almost as if you're telling me what to do. That's not cool. There's no need for this stupid toxicity. Fine, I hope it was just my impression that you're arrogant and I'm actually wrong. Just in case, sorry if I happened to say something unpleasant to you.
At the moment when I, at Psatkh's request, was rebinding Kha-Beleh to a Titan skeleton so he would have a walking animation, it wasn't possible to import animations into the game. Therefore, the optimal solution for the situation was the one I chose. Unfortunately, I didn't have some of the plugins and I didn't think of your clever trick with manually changing the Maya version, so there was no question of any new animation.
And even now. There is a big difference. Slightly adjusting an existing animation—simply dragging one bone in space and creating a new keyframe. Or making a walking sequence from scratch with an animated cloak, given that we get the skeleton without control elements after export. Guess which one is easier at a glance.
That is, speaking metaphorically, it sounds like this: I say, "it's easy to move a brick from one place to another here," and you say, "you would have been better off building a house, and without half the tools, since you're so smart."