xray-16
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Wallmark normal/bump mapping
Should be rather easy, since it's already implemented (badly for at least R2). But I wonder, how much would it add to gameplay? Would it be worth the effort?
I don't see it's implemented. We don't care about gameplay, do we? We fix bugs and add engine features, and the subject is one of the features. This would significantly improve appearance of bullet holes and blood stains.
That's interesting. I had a "Mixed" build with some wicked LUA error, where some code clearly wants to load bumps. I got a crash due to it in R2. I'll try to remember this issue and dig a little deeper.