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Update im giving it a more agressive tone with some kind of evil accesory - armor, because at first i thought "irrlicht" was some kind of fairy like spirit, but reading a little more it looks like its a evil - mad one. Polys are going high and high XD, 3.700 for now, probably gonna hit 4k. I updated the wing texture and probably gonna update some body parts too so the cloth doesnt look "stick" to the skin. The seams can be corrected by overpainting the texture, i tested i works ok.
As for the normal-binormal-tangent calculation, it has indeed flaws, the polygons look a little "cut" when the normal map is applied but it looks better than the implemented one
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I upload the update later, im still chopping the old hands and sticking the new ones jeje.