"""Run a script in headless Blender at below-normal priority (the user works on this PC): python run_blender.py script.py [blend] [-- args]"""
import subprocess, sys, os
BL = r'E:\Steam\steamapps\common\Blender\blender.exe'
a = sys.argv[1:]
script = a[0]; rest = a[1:]
blend = []
if rest and rest[0].endswith('.blend'):
    blend = [rest[0]]; rest = rest[1:]
cmd = [BL, '-b'] + blend + ['--factory-startup', '-t', '0', '--python', script] + rest
p = subprocess.Popen(cmd, creationflags=subprocess.BELOW_NORMAL_PRIORITY_CLASS, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                     text=True, encoding='utf-8', errors='replace')
out = []
for line in p.stdout:
    out.append(line)
p.wait()
txt = ''.join(out)
keep = [l for l in txt.splitlines() if not l.startswith(('Read prefs', 'Blender quit', 'Warning: Unable'))]
print('\n'.join(keep[-80:]))
sys.exit(p.returncode)