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shimmering veins btw is most probably specularity mapping, NOT normal mapping... that's much older tech (its a grayscale image with whiter shades in different areas for which angles it should shimmer at... it can be animated and triggered as well)...
the thing is, normal mapping affects gameplay zero, and thats the king for me... i still find doom2 worthwhile, cause its fun, regardless of how it looks. For others its different, i know.
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