Blender python バックグラウンド実行

非破壊で実行したいときに使える

参考

EZBaker/devices\blender\__init__.py

code:process.py

import argparse

import subprocess

import sys

import tempfile

from pathlib import Path

import bpy

def run_export_process(context: bpy.types.Context) -> None:

scn = context.scene

settings = scn.yfx_exporter_settings

exporter = Exporter()

exporter.export(context, settings)

def start_foreground_export(context: bpy.types.Context) -> None:

run_export_process(context)

def start_background_export(context: bpy.types.Context) -> None:

export_settings = context.scene.yfx_exporter_settings.export_settings

abs_export_path = bpy.path.abspath(export_settings.export_path)

with tempfile.TemporaryDirectory() as temp_dir:

temp_file = str(Path(temp_dir) / "___yfx_exporter_temp___.blend")

bpy.ops.wm.save_as_mainfile(filepath=temp_file, copy=True, check_existing=False)

exec_script_path = __file__

exec_script_dir = Path(exec_script_path).parent

blender_args = [

bpy.app.binary_path,

"--factory-startup",

"--addons",

"--background",

temp_file,

"--python",

exec_script_path,

"--",

"--output",

abs_export_path,

]

with subprocess.Popen(

blender_args,

stdout=subprocess.PIPE,

stderr=subprocess.PIPE,

encoding="UTF-8",

cwd=str(exec_script_dir),

) as proc:

print(proc.stdout.read())

msg_stderr = proc.stderr.read()

if msg_stderr:

raise ExportError(msg_stderr)

if __name__ == "__main__":

parser = argparse.ArgumentParser()

parser.add_argument("--output", type=str)

output = args.output

context = bpy.context

settings = context.scene.yfx_exporter_settings

export_settings = settings.export_settings

export_settings.export_path = output

run_export_process(context)

絶対パス指定すればいける

code:property.py

class YFX_EXPORTER_PG_settings(bpy.types.PropertyGroup):

export_settings: bpy.props.PointerProperty(type=YFX_EXPORTER_PG_export_settings)

is_subprocess: bpy.props.BoolProperty()

def export(self, context: bpy.types.Context) -> None:

run_export_process(context)

カレントディレクトリを指定すれば不要(相対インポートはできない)

code:cwd.py

from yfx_exporter.exporter import Exporter // scriptで相対インポートはできない

with subprocess.Popen(

blender_args,

stdout=subprocess.PIPE,

encoding="UTF-8",

cwd=str(exec_script_dir), # カレントの指定が必要

) as proc:

print(proc.stdout.read())

main や引数もとれるぽい