### Generate VRM Character and Export to File

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Automates the steps in Create Humanoid VRM and exports it as a VRM. Initializes the add-on if running as a module, creates an armature with humanoid bones, and exports.

```python
from pathlib import Path

import bpy

# Initialize

if bpy.app.module:
    bpy.ops.preferences.addon_enable(module="io_scene_vrm")

# Create an armature

armature_data = bpy.data.armatures.new("Armature")
armature_object = bpy.data.objects.new("Armature", armature_data)
bpy.context.scene.collection.objects.link(armature_object)
bpy.context.view_layer.objects.active = armature_object

bpy.ops.object.mode_set(mode="EDIT")

hips_bone = armature_data.edit_bones.new("hips")
hips_bone.head = (0, 0, 0.5)
hips_bone.tail = (0, 1, 0.5)
hips_bone_name = hips_bone.name

right_upper_leg_bone = armature_data.edit_bones.new("upper_leg.R")
right_upper_leg_bone.head = (-0.125, 0, 0.5)
right_upper_leg_bone.tail = (-0.125, 1, 0.5)
right_upper_leg_bone.parent = hips_bone
right_upper_leg_bone_name = right_upper_leg_bone.name

right_lower_leg_bone = armature_data.edit_bones.new("lower_leg.R")
right_lower_leg_bone.head = (-0.125, 0, 0.25)
right_lower_leg_bone.tail = (-0.125, 1, 0.25)
right_lower_leg_bone.parent = right_upper_leg_bone
right_lower_leg_bone_name = right_lower_leg_bone.name

right_foot_bone = armature_data.edit_bones.new("foot.R")
right_foot_bone.head = (-0.125, 0, 0)
right_foot_bone.tail = (-0.125, 1, 0)
right_foot_bone.parent = right_lower_leg_bone
right_foot_bone_name = right_foot_bone.name

left_upper_leg_bone = armature_data.edit_bones.new("upper_leg.L")
left_upper_leg_bone.head = (0.125, 0, 0.5)
left_upper_leg_bone.tail = (0.125, 1, 0.5)
left_upper_leg_bone.parent = hips_bone
left_upper_leg_bone_name = left_upper_leg_bone.name

left_lower_leg_bone = armature_data.edit_bones.new("lower_leg.L")
left_lower_leg_bone.head = (0.125, 0, 0.25)
left_lower_leg_bone.tail = (0.125, 1, 0.25)
left_lower_leg_bone.parent = left_upper_leg_bone
left_lower_leg_bone_name = left_lower_leg_bone.name

left_foot_bone = armature_data.edit_bones.new("foot.L")
left_foot_bone.head = (0.125, 0, 0)
left_foot_bone.tail = (0.125, 1, 0)
left_foot_bone.parent = left_lower_leg_bone
left_foot_bone_name = left_foot_bone.name

spine_bone = armature_data.edit_bones.new("spine")
spine_bone.head = (0, 0, 0.625)
spine_bone.tail = (0, 1, 0.625)
spine_bone.parent = hips_bone
spine_bone_name = spine_bone.name

right_upper_arm_bone = armature_data.edit_bones.new("upper_arm.R")
right_upper_arm_bone.head = (-0.125, 0, 0.75)
right_upper_arm_bone.tail = (-0.125, 1, 0.75)
right_upper_arm_bone.parent = spine_bone
right_upper_arm_bone_name = right_upper_arm_bone.name

right_lower_arm_bone = armature_data.edit_bones.new("lower_arm.R")
right_lower_arm_bone.head = (-0.25, 0, 0.75)
right_lower_arm_bone.tail = (-0.25, 1, 0.75)
right_lower_arm_bone.parent = right_upper_arm_bone
right_lower_arm_bone_name = right_lower_arm_bone.name

right_hand_bone = armature_data.edit_bones.new("hand.R")
right_hand_bone.head = (-0.375, 0, 0.75)
right_hand_bone.tail = (-0.375, 1, 0.75)
right_hand_bone.parent = right_lower_arm_bone
right_hand_bone_name = right_hand_bone.name

left_upper_arm_bone = armature_data.edit_bones.new("upper_arm.L")
left_upper_arm_bone.head = (0.125, 0, 0.75)
left_upper_arm_bone.tail = (0.125, 1, 0.75)
left_upper_arm_bone.parent = spine_bone
left_upper_arm_bone_name = left_upper_arm_bone.name

left_lower_arm_bone = armature_data.edit_bones.new("lower_arm.L")
left_lower_arm_bone.head = (0.25, 0, 0.75)
left_lower_arm_bone.tail = (0.25, 1, 0.75)
left_lower_arm_bone.parent = left_upper_arm_bone
left_lower_arm_bone_name = left_lower_arm_bone.name

left_hand_bone = armature_data.edit_bones.new("hand.L")
left_hand_bone.head = (0.375, 0, 0.75)
left_hand_bone.tail = (0.375, 1, 0.75)
left_hand_bone.parent = left_lower_arm_bone
left_hand_bone_name = left_hand_bone.name

head_bone = armature_data.edit_bones.new("head")
head_bone.head = (0, 0, 0.75)
head_bone.tail = (0, 1, 0.75)
head_bone.parent = spine_bone
head_bone_name = head_bone.name

bpy.ops.object.mode_set(mode="OBJECT")

# Assign VRM human bones

```

--------------------------------

### VRM MToon Material Settings

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Demonstrates how to create a new MToon material and configure its properties, including textures, shading, and outline settings, using the add-on's scripting API.

```APIDOC
## VRM MToon Material Settings

### Description
This script creates a new MToon material and configures its various properties such as base color, textures, alpha mode, and outline settings.

### Method
Python script (Blender API)

### Usage
Run in Blender's Scripting workspace or as a script.

### Code Example
```python
import bpy

context = bpy.context

image = context.blend_data.images.new(name="New Image", width=32, height=32)

material = context.blend_data.materials.new("New MToon Material")
material.vrm_addon_extension.mtoon1.enabled = True

gltf = material.vrm_addon_extension.mtoon1
gltf.pbr_metallic_roughness.base_color_factor = (0, 1, 0, 1)
gltf.pbr_metallic_roughness.base_color_texture.index.source = image

# Similar settings can be made for textures other than "base_color_texture"
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.mag_filter = (
    "NEAREST"  # or "LINEAR"
)
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.min_filter = "NEAREST"  # or "LINEAR", "NEAREST_MIPMAP_NEAREST", "LINEAR_MIPMAP_NEAREST", "NEAREST_MIPMAP_LINEAR", "LINEAR_MIPMAP_LINEAR"
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.wrap_s = (
    "REPEAT"  # or "CLAMP_TO_EDGE", "MIRRORED_REPEAT"
)
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.wrap_t = (
    "REPEAT"  # or "CLAMP_TO_EDGE", "MIRRORED_REPEAT"
)
gltf.pbr_metallic_roughness.base_color_texture.extensions.khr_texture_transform.offset = (
    0,
    0,
)
gltf.pbr_metallic_roughness.base_color_texture.extensions.khr_texture_transform.scale = (
    1,
    1,
)

gltf.alpha_mode = "OPAQUE"  # or "MASK", "BLEND"
gltf.double_sided = False
gltf.alpha_cutoff = 0.5
gltf.normal_texture.index.source = image
gltf.normal_texture.scale = 1
gltf.emissive_texture.index.source = image
gltf.emissive_factor = (0, 0, 0)
gltf.extensions.khr_materials_emissive_strength.emissive_strength = 1.0

mtoon = gltf.extensions.vrmc_materials_mtoon
mtoon.transparent_with_z_write = False
mtoon.render_queue_offset_number = 0
mtoon.shade_multiply_texture.index.source = image
mtoon.shade_color_factor = (0, 0, 1)
mtoon.shading_shift_texture.index.source = image
mtoon.shading_shift_texture.scale = 1
mtoon.shading_shift_factor = 0
mtoon.shading_toony_factor = 0
mtoon.gi_equalization_factor = 0
mtoon.matcap_factor = (1, 1, 1)
mtoon.matcap_texture.index.source = image
mtoon.parametric_rim_color_factor = (0, 0, 0)
mtoon.rim_multiply_texture.index.source = image
mtoon.rim_lighting_mix_factor = 0
mtoon.parametric_rim_fresnel_power_factor = 1.0
mtoon.parametric_rim_lift_factor = 1.0
mtoon.outline_width_mode = "worldCoordinates"  # or "none", "screenCoordinates"
mtoon.outline_width_factor = 0.01
mtoon.outline_width_multiply_texture.index.source = image
mtoon.outline_color_factor = (0, 0, 0)
mtoon.outline_lighting_mix_factor = 0
mtoon.uv_animation_mask_texture.index.source = image
mtoon.uv_animation_scroll_x_speed_factor = 0
mtoon.uv_animation_scroll_y_speed_factor = 0
mtoon.uv_animation_rotation_speed_factor = 0
```

### Notes
- The script enables the MToon extension on the material.
- Various texture properties are set to the same image for demonstration.
- The `mtoon` object provides access to MToon-specific settings.
```

--------------------------------

### Create development link for Blender 4.1.1 or earlier on Linux

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a symbolic link from the repository's src/io_scene_vrm folder to Blender's scripts/addons directory for Blender 4.1.1 or earlier on Linux.

```sh
blender_version=3.6
mkdir -p "$HOME/.config/blender/$blender_version/scripts/addons"
ln -Ts "$PWD/src/io_scene_vrm" "$HOME/.config/blender/$blender_version/scripts/addons/io_scene_vrm"
```

--------------------------------

### Create development link for Blender 4.1.1 or earlier on Windows PowerShell

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a directory junction from the repository's src/io_scene_vrm folder to Blender's scripts/addons directory for Blender 4.1.1 or earlier on Windows PowerShell.

```powershell
$blenderVersion = "3.6"
New-Item -ItemType Directory -Path "$Env:APPDATA\Blender Foundation\Blender\$blenderVersion\scripts\addons" -Force
New-Item -ItemType Junction -Path "$Env:APPDATA\Blender Foundation\Blender\$blenderVersion\scripts\addons\io_scene_vrm" -Value "$(Get-Location)\src\io_scene_vrm"
```

--------------------------------

### Import VRM file using bpy.ops.import_scene.vrm

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Imports a VRM model from a file path. Raises an exception if the import operation does not return {"FINISHED"}.

```python
import bpy

result = bpy.ops.import_scene.vrm(filepath="path_to_your_vrm_model.vrm")
if result != {"FINISHED"}:
    raise Exception(f"Failed to import vrm: {result}")
```

--------------------------------

### Export VRM file using bpy.ops.export_scene.vrm

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Exports the current scene as a VRM file to the user's home directory. Raises an exception if the export operation does not return {"FINISHED"} and prints the output filepath.

```python
import bpy
from pathlib import Path

output_filepath = str(Path.home() / "path_to_your_new_vrm_model.vrm")
result = bpy.ops.export_scene.vrm(filepath=output_filepath)
if result != {"FINISHED"}:
    raise Exception(f"Failed to export vrm: {result}")

print(f"{output_filepath=}")
```

--------------------------------

### VRM Human Bone Settings

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Demonstrates how to create an armature, add bones, and assign them to VRM 1.0 humanoid bone slots using the add-on's scripting API.

```APIDOC
## VRM Human Bone Settings

### Description
This script creates an armature, adds hips and spine bones, and assigns them to the VRM 1.0 humanoid bone slots using the add-on's extension properties.

### Method
Python script (Blender API)

### Usage
Run in Blender's Scripting workspace or as a script.

### Code Example
```python
import bpy

context = bpy.context

bpy.ops.object.add(type="ARMATURE", location=(0, 0, 0))
armature = context.object
armature.data.vrm_addon_extension.spec_version = "1.0"

bpy.ops.object.mode_set(mode="EDIT")

hips_bone = armature.data.edit_bones.new("hips")
hips_bone.head = (0, 0, 0.5)
hips_bone.tail = (0, 0, 0.75)

spine_bone = armature.data.edit_bones.new("spine")
spine_bone.parent = hips_bone
spine_bone.head = (0, 0, 0.75)
spine_bone.tail = (0, 0, 1)

bpy.ops.object.mode_set(mode="OBJECT")

armature.data.vrm_addon_extension.vrm1.humanoid.human_bones.hips.node.bone_name = "hips"
armature.data.vrm_addon_extension.vrm1.humanoid.human_bones.spine.node.bone_name = (
    "spine"
)
```

### Notes
- The script sets the VRM specification version to "1.0".
- Bones are created in Edit Mode and assigned in Object Mode.
- The `bone_name` property is used to link the bone to the VRM humanoid slot.
```

--------------------------------

### Create development link for Blender 4.2+ on Linux

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a symbolic link from the repository's src/io_scene_vrm folder to Blender's extensions/user_default directory for Blender 4.2 or later on Linux. Uses a junction for Windows, but this is the Linux variant.

```sh
blender_version=4.5
mkdir -p "$HOME/.config/blender/$blender_version/extensions/user_default"
ln -Ts "$PWD/src/io_scene_vrm" "$HOME/.config/blender/$blender_version/extensions/user_default/vrm"
```

--------------------------------

### Create development link for Blender 4.2+ on Windows PowerShell

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a directory junction from the repository's src/io_scene_vrm folder to Blender's extensions/user_default directory for Blender 4.2 or later on Windows PowerShell.

```powershell
$blenderVersion = "4.5"
New-Item -ItemType Directory -Path "$Env:APPDATA\Blender Foundation\Blender\$blenderVersion\extensions\user_default" -Force
New-Item -ItemType Junction -Path "$Env:APPDATA\Blender Foundation\Blender\$blenderVersion\extensions\user_default\vrm" -Value "$(Get-Location)\src\io_scene_vrm"
```

--------------------------------

### Create development link for Blender 4.1.1 or earlier on macOS

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a symbolic link from the repository's src/io_scene_vrm folder to Blender's scripts/addons directory for Blender 4.1.1 or earlier on macOS.

```sh
blender_version=3.6
mkdir -p "$HOME/Library/Application Support/Blender/$blender_version/scripts/addons"
ln -s "$PWD/src/io_scene_vrm" "$HOME/Library/Application Support/Blender/$blender_version/scripts/addons/io_scene_vrm"
```

--------------------------------

### Configure VRM MToon Material Settings

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Creates a new MToon material, enables it, and sets a wide range of properties including base color, textures, alpha mode, double-sided, emissive, and MToon-specific parameters. Use this to programmatically configure a VRM 1.0 MToon material.

```python
import bpy

context = bpy.context

image = context.blend_data.images.new(name="New Image", width=32, height=32)

material = context.blend_data.materials.new("New MToon Material")
material.vrm_addon_extension.mtoon1.enabled = True

gltf = material.vrm_addon_extension.mtoon1
gltf.pbr_metallic_roughness.base_color_factor = (0, 1, 0, 1)
gltf.pbr_metallic_roughness.base_color_texture.index.source = image

# Similar settings can be made for textures other than "base_color_texture"
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.mag_filter = (
    "NEAREST"  # or "LINEAR"
)
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.min_filter = "NEAREST"  # or "LINEAR", "NEAREST_MIPMAP_NEAREST", "LINEAR_MIPMAP_NEAREST", "NEAREST_MIPMAP_LINEAR", "LINEAR_MIPMAP_LINEAR"
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.wrap_s = (
    "REPEAT"  # or "CLAMP_TO_EDGE", "MIRRORED_REPEAT"
)
gltf.pbr_metallic_roughness.base_color_texture.index.sampler.wrap_t = (
    "REPEAT"  # or "CLAMP_TO_EDGE", "MIRRORED_REPEAT"
)
gltf.pbr_metallic_roughness.base_color_texture.extensions.khr_texture_transform.offset = (
    0,
    0,
)
gltf.pbr_metallic_roughness.base_color_texture.extensions.khr_texture_transform.scale = (
    1,
    1,
)

gltf.alpha_mode = "OPAQUE"  # or "MASK", "BLEND"
gltf.double_sided = False
gltf.alpha_cutoff = 0.5
gltf.normal_texture.index.source = image
gltf.normal_texture.scale = 1
gltf.emissive_texture.index.source = image
gltf.emissive_factor = (0, 0, 0)
gltf.extensions.khr_materials_emissive_strength.emissive_strength = 1.0

mtoon = gltf.extensions.vrmc_materials_mtoon
mtoon.transparent_with_z_write = False
mtoon.render_queue_offset_number = 0
mtoon.shade_multiply_texture.index.source = image
mtoon.shade_color_factor = (0, 0, 1)
mtoon.shading_shift_texture.index.source = image
mtoon.shading_shift_texture.scale = 1
mtoon.shading_shift_factor = 0
mtoon.shading_toony_factor = 0
mtoon.gi_equalization_factor = 0
mtoon.matcap_factor = (1, 1, 1)
mtoon.matcap_texture.index.source = image
mtoon.parametric_rim_color_factor = (0, 0, 0)
mtoon.rim_multiply_texture.index.source = image
mtoon.rim_lighting_mix_factor = 0
mtoon.parametric_rim_fresnel_power_factor = 1.0
mtoon.parametric_rim_lift_factor = 1.0
mtoon.outline_width_mode = "worldCoordinates"  # or "none", "screenCoordinates"
mtoon.outline_width_factor = 0.01
mtoon.outline_width_multiply_texture.index.source = image
mtoon.outline_color_factor = (0, 0, 0)
mtoon.outline_lighting_mix_factor = 0
mtoon.uv_animation_mask_texture.index.source = image
mtoon.uv_animation_scroll_x_speed_factor = 0
mtoon.uv_animation_scroll_y_speed_factor = 0
mtoon.uv_animation_rotation_speed_factor = 0
```

--------------------------------

### Set VRM Metadata and Export to File

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Sets the VRM metadata (name and version) and exports the model to a .vrm file using bpy.ops.export_scene.vrm. Raises an error if the export fails and prints the output file path on success.

```python
# Set metadata

meta = armature_data.vrm_addon_extension.vrm1.meta
meta.vrm_name = "Your Model Name"
meta.version = "1.0.0"

# Save to a file

output_filepath = str(Path(__file__).parent / "path_to_your_vrm_model.vrm")
result = bpy.ops.export_scene.vrm(filepath=output_filepath)
if result != {"FINISHED"}:
    message = f"Failed to export vrm: {result}"
    raise RuntimeError(message)

print(f'Saved the VRM file to "{output_filepath}"')
```

--------------------------------

### Create development link for Blender 4.2+ on macOS

Source: https://vrm-addon-for-blender.info/en-us/development/

Creates a symbolic link from the repository's src/io_scene_vrm folder to Blender's extensions/user_default directory for Blender 4.2 or later on macOS.

```sh
blender_version=4.5
mkdir -p "$HOME/Library/Application Support/Blender/$blender_version/extensions/user_default"
ln -s "$PWD/src/io_scene_vrm" "$HOME/Library/Application Support/Blender/$blender_version/extensions/user_default/vrm"
```

--------------------------------

### Build Release Output

Source: https://vrm-addon-for-blender.info/en-us/development/

Expected output after running ./tools/build_release.sh, indicating a successful build. It shows the paths to the generated zip files for Blender 4.2 or later and Blender 2.93 - 4.1.

```text
|
| Release Build Completed
|
| - Blender 4.2 or later:
|   /workspace/release_output/VRM_Addon_for_Blender-Extension-0_0_0.zip
|
| - Blender 2.93 - 4.1:
|   /workspace/release_output/VRM_Addon_for_Blender-0_0_0.zip
|

```

--------------------------------

### Set VRM 1.0 metadata on an armature

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Creates an armature and configures VRM 1.0 metadata fields such as name, version, authors, permissions, and usage restrictions. Comments indicate allowed values for several fields.

```python
import bpy

context = bpy.context

bpy.ops.object.add(type="ARMATURE", location=(0, 0, 0))

armature = context.object
armature.data.vrm_addon_extension.spec_version = "1.0"

meta = armature.data.vrm_addon_extension.vrm1.meta
meta.vrm_name = "Your Model Name"
meta.version = "1.0.0"
meta.authors.add().value = "Author 1"
meta.copyright_information = "Copyright Information"
meta.contact_information = "Contact Information"
meta.references.add().value = "https://example.com"
meta.third_party_licenses = "Third Party Licenses"
thumbnail_image = context.blend_data.images.new(name="New Image", width=32, height=32)
meta.thumbnail_image = thumbnail_image
meta.avatar_permission = "onlyAuthor"  # or "onlySeparatelyLicensedPerson", "everyone"
meta.allow_excessively_violent_usage = False
meta.allow_excessively_sexual_usage = False
meta.commercial_usage = "personalNonProfit"  # or "personalProfit", "corporation"
meta.allow_political_or_religious_usage = False
meta.allow_antisocial_or_hate_usage = False
meta.credit_notation = "required"  # or "unnecessary"
meta.allow_redistribution = False
meta.modification = (
    "prohibited"  # or "allowModification", "allowModificationRedistribution"
)
meta.other_license_url = ""
```

--------------------------------

### Set VRM 1.0 Human Bone Settings (hips and spine)

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Creates an armature, sets its spec_version to "1.0", adds hips and spine edit bones, and assigns them to the VRM humanoid human_bones nodes. Use this to programmatically define the required human bones for a VRM 1.0 model.

```python
import bpy

context = bpy.context

bpy.ops.object.add(type="ARMATURE", location=(0, 0, 0))
armature = context.object
armature.data.vrm_addon_extension.spec_version = "1.0"

bpy.ops.object.mode_set(mode="EDIT")

hips_bone = armature.data.edit_bones.new("hips")
hips_bone.head = (0, 0, 0.5)
hips_bone.tail = (0, 0, 0.75)

spine_bone = armature.data.edit_bones.new("spine")
spine_bone.parent = hips_bone
spine_bone.head = (0, 0, 0.75)
spine_bone.tail = (0, 0, 1)

bpy.ops.object.mode_set(mode="OBJECT")

armature.data.vrm_addon_extension.vrm1.humanoid.human_bones.hips.node.bone_name = "hips"
armature.data.vrm_addon_extension.vrm1.humanoid.human_bones.spine.node.bone_name = (
    "spine"
)
```

--------------------------------

### Add Meshes and Parent to Armature Bones

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Creates primitive meshes (sphere, cube, ico sphere) and parents each to the corresponding armature bone using the parent_bone property. This step visually represents the VRM character's body parts.

```python
# Add meshes

bpy.ops.mesh.primitive_uv_sphere_add(radius=0.25)
head = bpy.context.active_object
head.parent = armature_object
head.parent_bone = humanoid.human_bones.head.node.bone_name
head.parent_type = "BONE"

bpy.ops.mesh.primitive_cube_add(size=0.4)
spine = bpy.context.active_object
spine.parent = armature_object
spine.parent_bone = humanoid.human_bones.spine.node.bone_name
spine.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
left_upper_arm = bpy.context.active_object
left_upper_arm.parent = armature_object
left_upper_arm.parent_bone = humanoid.human_bones.left_upper_arm.node.bone_name
left_upper_arm.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
left_hand = bpy.context.active_object
left_hand.parent = armature_object
left_hand.parent_bone = humanoid.human_bones.left_hand.node.bone_name
left_hand.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
right_upper_arm = bpy.context.active_object
right_upper_arm.parent = armature_object
right_upper_arm.parent_bone = humanoid.human_bones.right_upper_arm.node.bone_name
right_upper_arm.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
right_hand = bpy.context.active_object
right_hand.parent = armature_object
right_hand.parent_bone = humanoid.human_bones.right_hand.node.bone_name
right_hand.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
left_upper_leg = bpy.context.active_object
left_upper_leg.parent = armature_object
left_upper_leg.parent_bone = humanoid.human_bones.left_upper_leg.node.bone_name
left_upper_leg.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
right_upper_leg = bpy.context.active_object
right_upper_leg.parent = armature_object
right_upper_leg.parent_bone = humanoid.human_bones.right_upper_leg.node.bone_name
right_upper_leg.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
left_lower_leg = bpy.context.active_object
left_lower_leg.parent = armature_object
left_lower_leg.parent_bone = humanoid.human_bones.left_lower_leg.node.bone_name
left_lower_leg.parent_type = "BONE"

bpy.ops.mesh.primitive_ico_sphere_add(radius=0.1)
right_lower_leg = bpy.context.active_object
right_lower_leg.parent = armature_object
right_lower_leg.parent_bone = humanoid.human_bones.right_lower_leg.node.bone_name
right_lower_leg.parent_type = "BONE"
```

--------------------------------

### Importing VRM files

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Imports a VRM model from a file path using the Blender operator bpy.ops.import_scene.vrm. The result is checked to ensure the operation finished successfully.

```APIDOC
## Importing VRM files

### Description
Imports a VRM model from a file path using the Blender operator `bpy.ops.import_scene.vrm`.

### Method
`bpy.ops.import_scene.vrm`

### Parameters
- `filepath` (string) - Required - The path to the VRM file to import.

### Request Example
```python
import bpy

result = bpy.ops.import_scene.vrm(filepath="path_to_your_vrm_model.vrm")
if result != {"FINISHED"}:
    raise Exception(f"Failed to import vrm: {result}")
```

### Response
Returns a set indicating the operation result, e.g., `{"FINISHED"}` on success.
```

--------------------------------

### Exporting VRM files

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Exports the current scene to a VRM file using the Blender operator bpy.ops.export_scene.vrm. The output file path is specified and the result is checked for success.

```APIDOC
## Exporting VRM files

### Description
Exports the current scene to a VRM file using the Blender operator `bpy.ops.export_scene.vrm`.

### Method
`bpy.ops.export_scene.vrm`

### Parameters
- `filepath` (string) - Required - The output file path for the VRM file.

### Request Example
```python
import bpy
from pathlib import Path

output_filepath = str(Path.home() / "path_to_your_new_vrm_model.vrm")
result = bpy.ops.export_scene.vrm(filepath=output_filepath)
if result != {"FINISHED"}:
    raise Exception(f"Failed to export vrm: {result}")

print(f"{output_filepath=}")
```

### Response
Returns a set indicating the operation result, e.g., `{"FINISHED"}` on success.
```

--------------------------------

### VRM Metadata Settings (VRM 1.0)

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Sets VRM 1.0 metadata on an armature object, including model name, version, authors, permissions, and usage restrictions.

```APIDOC
## VRM Metadata Settings (VRM 1.0)

### Description
Sets VRM 1.0 metadata on an armature object, including model name, version, authors, permissions, and usage restrictions.

### Method
Direct property assignment on `armature.data.vrm_addon_extension`.

### Parameters
- `spec_version` (string) - Required - The VRM specification version, e.g., "1.0".
- `vrm_name` (string) - Required - The model name.
- `version` (string) - Required - The model version.
- `authors` (collection) - Required - List of author names; use `.add().value` to append.
- `copyright_information` (string) - Optional - Copyright information.
- `contact_information` (string) - Optional - Contact information.
- `references` (collection) - Optional - List of reference URLs; use `.add().value` to append.
- `third_party_licenses` (string) - Optional - Third-party licenses.
- `thumbnail_image` (image) - Optional - Thumbnail image.
- `avatar_permission` (enum) - Required - One of "onlyAuthor", "onlySeparatelyLicensedPerson", "everyone".
- `allow_excessively_violent_usage` (bool) - Required - Whether excessively violent usage is allowed.
- `allow_excessively_sexual_usage` (bool) - Required - Whether excessively sexual usage is allowed.
- `commercial_usage` (enum) - Required - One of "personalNonProfit", "personalProfit", "corporation".
- `allow_political_or_religious_usage` (bool) - Required - Whether political or religious usage is allowed.
- `allow_antisocial_or_hate_usage` (bool) - Required - Whether antisocial or hate usage is allowed.
- `credit_notation` (enum) - Required - One of "required", "unnecessary".
- `allow_redistribution` (bool) - Required - Whether redistribution is allowed.
- `modification` (enum) - Required - One of "prohibited", "allowModification", "allowModificationRedistribution".
- `other_license_url` (string) - Optional - URL to other license.

### Request Example
```python
import bpy

context = bpy.context

bpy.ops.object.add(type="ARMATURE", location=(0, 0, 0))

armature = context.object
armature.data.vrm_addon_extension.spec_version = "1.0"

meta = armature.data.vrm_addon_extension.vrm1.meta
meta.vrm_name = "Your Model Name"
meta.version = "1.0.0"
meta.authors.add().value = "Author 1"
meta.copyright_information = "Copyright Information"
meta.contact_information = "Contact Information"
meta.references.add().value = "https://example.com"
meta.third_party_licenses = "Third Party Licenses"
thumbnail_image = context.blend_data.images.new(name="New Image", width=32, height=32)
meta.thumbnail_image = thumbnail_image
meta.avatar_permission = "onlyAuthor"  # or "onlySeparatelyLicensedPerson", "everyone"
meta.allow_excessively_violent_usage = False
meta.allow_excessively_sexual_usage = False
meta.commercial_usage = "personalNonProfit"  # or "personalProfit", "corporation"
meta.allow_political_or_religious_usage = False
meta.allow_antisocial_or_hate_usage = False
meta.credit_notation = "required"  # or "unnecessary"
meta.allow_redistribution = False
meta.modification = (
    "prohibited"  # or "allowModification", "allowModificationRedistribution"
)
meta.other_license_url = ""
```

### Response
No explicit response; the properties are set directly on the object.
```

--------------------------------

### Set VRM Humanoid Bone Assignments

Source: https://vrm-addon-for-blender.info/en-us/scripting-api/

Assigns bone names to the VRM humanoid's required bones (head, spine, hips, arms, hands, legs, feet) via the vrm_addon_extension.vrm1.humanoid API. This is the first step in generating a VRM character dynamically.

```python
humanoid = armature_data.vrm_addon_extension.vrm1.humanoid
humanoid.human_bones.head.node.bone_name = head_bone_name
humanoid.human_bones.spine.node.bone_name = spine_bone_name
humanoid.human_bones.hips.node.bone_name = hips_bone_name
humanoid.human_bones.right_upper_arm.node.bone_name = right_upper_arm_bone_name
humanoid.human_bones.right_lower_arm.node.bone_name = right_lower_arm_bone_name
humanoid.human_bones.right_hand.node.bone_name = right_hand_bone_name
humanoid.human_bones.left_upper_arm.node.bone_name = left_upper_arm_bone_name
humanoid.human_bones.left_lower_arm.node.bone_name = left_lower_arm_bone_name
humanoid.human_bones.left_hand.node.bone_name = left_hand_bone_name
humanoid.human_bones.right_upper_leg.node.bone_name = right_upper_leg_bone_name
humanoid.human_bones.right_lower_leg.node.bone_name = right_lower_leg_bone_name
humanoid.human_bones.right_foot.node.bone_name = right_foot_bone_name
humanoid.human_bones.left_upper_leg.node.bone_name = left_upper_leg_bone_name
humanoid.human_bones.left_lower_leg.node.bone_name = left_lower_leg_bone_name
humanoid.human_bones.left_foot.node.bone_name = left_foot_bone_name
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.