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# This script is an example of how you can run blender from the command line (in background mode with no interface)
# to automate tasks, in this example it creates a text object, camera and light, then renders and/or saves it.
# This example also shows how you can parse command line options to python scripts.
#
# Example usage for this test.
# blender --background --factory-startup --python $HOME/background_job.py -- --text="Hello World" --render="/tmp/hello" --save="/tmp/hello.blend"
#
# Notice:
# '--factory-startup' is used to avoid the user default settings from interfearing with automated scene generation.
# '--' causes blender to ignore all following arguments so python can use them.
#
# See blender --help for details.
import bpy
def example_function(body_text, save_path, render_path):
scene = bpy.context.scene
# Clear existing objects.
scene.camera = None
for obj in scene.objects:
scene.objects.unlink(obj)
txt_data = bpy.data.curves.new(name="MyText", type='FONT')
# Text Object
txt_ob = bpy.data.objects.new(name="MyText", object_data=txt_data)
scene.objects.link(txt_ob) # add the data to the scene as an object
txt_data.body = body_text # set the body text to the command line arg given
txt_data.align = 'CENTER' # center text
# Camera
cam_data = bpy.data.cameras.new("MyCam") # create new camera data
cam_ob = bpy.data.objects.new(name="MyCam", object_data=cam_data)
scene.objects.link(cam_ob) # add the camera data to the scene (creating a new object)
scene.camera = cam_ob # set the active camera
cam_ob.location = 0.0, 0.0, 10.0
# Lamp
lamp_data = bpy.data.lamps.new("MyLamp", 'POINT')
lamp_ob = bpy.data.objects.new(name="MyCam", object_data=lamp_data)
scene.objects.link(lamp_ob)
lamp_ob.location = 2.0, 2.0, 5.0
if save_path:
try:
f = open(save_path, 'w')
f.close()
ok = True
except:
print("Cannot save to path %r" % save_path)
import traceback
traceback.print_exc()
if ok:
bpy.ops.wm.save_as_mainfile(filepath=save_path)
if render_path:
render = scene.render
render.use_file_extension = True
render.filepath = render_path
bpy.ops.render.render(write_still=True)
import sys # to get command line args
import optparse # to parse options for us and print a nice help message
def main():
# get the args passed to blender after "--", all of which are ignored by blender specifically
# so python may receive its own arguments
argv = sys.argv
if "--" not in argv:
argv = [] # as if no args are passed
else:
argv = argv[argv.index("--") + 1:] # get all args after "--"
# When --help or no args are given, print this help
usage_text = "Run blender in background mode with this script:"
usage_text += " blender --background --python " + __file__ + " -- [options]"
parser = optparse.OptionParser(usage=usage_text)
# Example background utility, add some text and renders or saves it (with options)
# Possible types are: string, int, long, choice, float and complex.
parser.add_option("-t", "--text", dest="body_text", help="This text will be used to render an image", type="string")
parser.add_option("-s", "--save", dest="save_path", help="Save the generated file to the specified path", metavar='FILE')
parser.add_option("-r", "--render", dest="render_path", help="Render an image to the specified path", metavar='FILE')
options, args = parser.parse_args(argv) # In this example we wont use the args
if not argv:
parser.print_help()
return
if not options.body_text:
print("Error: --text=\"some string\" argument not given, aborting.")
parser.print_help()
return
# Run the example function
example_function(options.body_text, options.save_path, options.render_path)
print("batch job finished, exiting")
if __name__ == "__main__":
main()
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