ALPaintExtract.py

# Based on Goodjooy/AzurLane-PaintingExtract
# this assumes that the mesh transform is in sorted four line corner pairs

import unitypack, os, re
from unitypack.export import OBJMesh
from PIL import Image, ImageOps

VR = re.compile(r'v ')
TR = re.compile(r'vt ')
SR = re.compile(r' ')

def recon(src, mesh):
	sx, sy = src.size
	c = map(SR.split, list(filter(TR.match, mesh))[1::2])
	p = map(SR.split, list(filter(VR.match, mesh))[1::2])
	c = [(round(float(a[1])*sx), round((1-float(a[2]))*sy)) for a in c]
	p = [(-int(float(a[1])), int(float(a[2]))) for a in p]
	my = max(y for x, y in p)
	p = [(x, my-y) for x, y in p[::2]]
	cp = [(l+r, p) for l, r, p in zip(c[::2], c[1::2], p)]
	ox, oy = zip(*[(r-l+p, b-t+q) for (l, t, r, b), (p, q) in cp])
	out = Image.new('RGBA', (max(ox), max(oy)))
	for c, p in cp: out.paste(src.crop(c), p)
	return out
	
for i in os.scandir(os.getcwd()+'\.'):
	if i.is_file() and len(i.name.split('.'))==1:
		with open(os.getcwd()+'\\'+i.name, "rb") as f:
			try: bundle = unitypack.load(f)
			except: continue
			for asset in bundle.assets:
				for id, obj in asset.objects.items():
					if obj.type == "Mesh":
						try: mesh = OBJMesh(obj.read()).export().splitlines()
						except: continue
					elif obj.type == "Texture2D":
						try: img = ImageOps.flip(obj.read().image)
						except: continue
			try:
				recon(img, mesh).save(os.getcwd()+'\\'+i.name+'.png', optimize=True)
				del img, mesh
			except: continue