Is it possible to bake textures from the command line?

This is useful for setting up batch jobs, baking an entire level for example.


1 Answer 1


Yes, the bake operator can run in background mode, for both Blender-Internal and Cycles Baking.

A very simple script could look like this:

Bake Once


 import bpy

 # Like pressing the 'Bake' button in Blender
 # this will remain locked until the bake is complete.

 # You might want to inspect the materials and extract images
 # but for this example, simply select by name
 image = bpy.data.images["Untitled"]

 # save-as by setting the target path and saving
 image.file_format = 'PNG'
 image.filepath_raw = "//my_new_bake.png"

Execute the bake with:

 blender --background bake_test.blend --python bake.py

For batch jobs you would have to change the selection before calling bpy.ops.object.bake each time.

Bake Everything

This next example is more comprehensive, and uses the is_dirty image flag to detect which images to save, giving each image a _bake suffix.


# Blender v2.8x +
import bpy
import os

scene = bpy.context.scene
for obj in scene.objects:

for obj in scene.objects:
    if obj.type != 'MESH':

    bpy.context.view_layer.objects.active = obj


# save all baked images
for image in bpy.data.images:
    if image.is_dirty:
        # foo.png -> foo_bake.png
        filepath, filepath_ext = os.path.splitext(image.filepath_raw)
        image.filepath_raw = filepath + "_bake" + filepath_ext

Execute the bake with:

 blender --background bake_test.blend --python bake_all.py

Further ideas for batch baking which might be useful.

  • Automate baking an entire game-level:

    loop over each group and bake its objects (or each group matching a naming convention, ending with .bake for example)

  • Automate baking existing models:

    A utility script which loads in models from an external format (OBJ, FBX, 3DS... etc), unwrap, assign images, bake and exports.

  • Automate low-poly mesh creation with the decimate modifier, and bake normal maps (high->low poly meshes).

  • Bake textures over time (create a baked image sequence).

  • Create a utility which runs back in a background process so you can keep on using Blender.

  • $\begingroup$ I think need to register this, I got errors: bpy.utils.unregister_class(cls) RuntimeError: unregister_class(...):, missing bl_rna attribute from 'RNAMeta' instance (may not be registered) Blender quit C:\3D>C:\blender-3.4.0-alpha+master.d4d40f3b69d8-windows.amd64-release\blender.exe --version Blender 3.4.0 Alpha build date: 2022-10-03 $\endgroup$ Oct 29, 2022 at 11:32
  • $\begingroup$ I tested with blend file and need active image ...Info: No active image found in material "Procedual..." (0) for object "Sphere" Info: No active image found in material "Procedual ..." (0) for object "Cylinder" $\endgroup$ Oct 29, 2022 at 11:34

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