I am making an addon to launch background rendering in GUI. I want to use subprocess.Popen to execute blender with -b. And here is my code:
import bpy
import subprocess
import multiprocessing
FILE = "test.blend"
class Background_Render(bpy.types.Operator):
"""call blender in background"""
bl_idname = "render.back_render"
bl_label = "Render in Background"
def execute(self, context):
#render_task()
task = multiprocessing.Process(target=self.render_task, args=(context, ))
task.start()
return {"FINISHED"}
def render_task(self, context):
argument = ['blender', '-b', FILE, '-f', '1']
process_handle = subprocess.Popen(
argument,
stdout = subprocess.PIPE,
stderr=subprocess.STDOUT
)
for line in iter(process_handle.stdout.readline, b''):
print(line.rstrip().decode()) # print for debug
# both below not work
context.area.header_text_set(line.rstrip().decode()) # show info in GUI
context.area.header_text_set() # set empty after finish
My first approach is run Popen or say render_task directly, however blender will freeze when I start the job. So I commented it away. And I added the call to a multiprocessing.Process. It not get freezed. Unfortunately, string can be print into terminal but not into GUI with context.area.header_text_set or Operator.report.
What is the best practice to show data in multiprocess? And why they are not showing?
