Rigging API

Add a skeleton (armature) to a humanoid 3D model and bind the mesh to it, so the character is ready to animate. To apply animations to a rigged character, see the Animation API.

Rigging works well only with standard humanoid (bipedal) characters that have a clearly defined limb and body structure.

POST/openapi/v1/rigging

Create a Rigging task

Creates a Rigging task for a 3D model. When the task succeeds, it returns a rigged character in standard formats and, optionally, basic walking and running animations.

The task runs in the background. For how long a task usually takes, see Processing times.

Rigging isn't suitable for these models:

Untextured meshes
Non-humanoid assets
Humanoid assets with an unclear limb and body structure

Request

POST

/openapi/v1/rigging

# Rig a model from a URL
curl https://api.meshy.ai/openapi/v1/rigging \
  -X POST \
  -H "Authorization: Bearer ${YOUR_API_KEY}" \
  -H 'Content-Type: application/json' \
  -d '{
    "model_url": "YOUR_MODEL_URL_OR_DATA_URI",
    "height_meters": 1.8
  }'

Response

{
  "result": "018b314a-a1b5-716d-c222-2f1776f7f579"
}

Parameters

Name
input_task_id
Type
string
Required
Description
Required unless you send model_url. The ID of the task whose model you want to rig. Meshy supports textured humanoid models.
The model can have at most 380,000 triangles (a quad counts as 2), and a model with more returns 400. To stay under the limit, run the Remesh API on it first with a target_polycount of 300000 or less, or 150000 or less with topology: quad.

Name
model_url
Type
string
Required
Description
Required unless you send input_task_id. The model to rig, as a public URL or a data URI. If you send both, Meshy uses input_task_id.
The model must be a GLB (.glb) file of at most 400 MB from an http or https URL, or 100 MB as a data URI. Rigging supports textured humanoid models.
The model can have at most 380,000 triangles (a quad counts as 2), and a model with more returns 400. To stay under the limit, run the Remesh API on it first with a target_polycount of 300000 or less, or 150000 or less with topology: quad.
The character's face must point toward the +Z axis, the standard glTF forward direction. Pose estimation fails for a model that faces another axis.
A file over 100 MB must also follow these rules:
- It can have at most 10,000,000 faces. A file with more returns 400. Meshy counts faces as triangles, and a mesh drawn more than once counts once per copy.
- It must not use Draco compression.

Name
height_meters
Type
number
default 1.7
Description
The character's approximate height, in meters. Meshy uses it to scale and rig the model more accurately. A negative value returns 400.
Name
texture_image_url
Type
string
⚠ deprecated
Description
Leave it out when the model has its own textures. Without it, Meshy uses the textures embedded in the model_url file, or the input task's textures. If you send it, this image becomes the rigged model's only texture, and the model loses its PBR maps.
The model's UV-unwrapped base color texture, as a public URL or a data URI. The image must be a PNG file of at most 20 MB. Another image format returns 400.

Returns

The result field of the response holds the ID of the new Rigging task.

Failure modes

Name
400 - Bad Request
Description
The request can't run. The error message says which problem it found. For example:
- Missing parameter: Neither model_url nor input_task_id was sent.
- Invalid model format: The model_url file has an unsupported extension. Only .glb is supported.
- Unreachable URL: Meshy can't download the model_url file.
- Model file too large: The model_url file is over 400 MB from an http or https URL, or over 100 MB as a data URI.
- Too many faces: The model_url file is over 100 MB and has more than 10,000,000 faces. Reduce the face count, then send the file again.
- Unreadable model file: The model_url file is over 100 MB, and Meshy can't read its header. For example, it's a Draco-compressed GLB.
- Model header too complex: The model_url file is over 100 MB, and its header has too many meshes, nodes, or records to check. Reduce the number of objects in the file, then send it again.
- Image too large: The texture_image_url image is over 20 MB.
- Invalid texture format: The texture_image_url image isn't a PNG file.
- Invalid height: height_meters is negative.
- Invalid input task: input_task_id doesn't refer to a valid API task.
- Input task not ready: The input_task_id task hasn't reached SUCCEEDED. Wait until it succeeds, then retry.
- Face count exceeded: The input model has more than 380,000 triangles (a quad counts as 2). Run the Remesh API on it with a target_polycount of 300000 or less, or 150000 or less with topology: quad, before you rig the model.
Fix the request, then send it again. See Errors.
Name
401 - Unauthorized
Description
The API key is missing or invalid. Check the Authorization header.
Name
402 - Payment Required
Description
For example:
- Insufficient credits: The account doesn't have enough credits for this task, or the account reached a credit limit. Check your credit balance, then retry.
- Free plan: Creating a task requires a paid plan. Upgrade your plan in your subscription settings, then retry.
Name
403 - Forbidden
Description
input_task_id is a bas-relief model, which this endpoint can't rig. The message is This model type does not support this operation. Send a different model.
Name
404 - Not Found
Description
Meshy can't find the files of the input_task_id task. One of these applies:
- Meshy deleted the task's files after its expires_at. Create the task again, then send that task's ID.
- The task has none of the files rigging needs, such as a preview image, for example a Convert task. Rig the task it came from, or send the model as model_url.
Name
422 - Unprocessable Entity
Description
Pose estimation failed. The model might not be a valid humanoid character. Send a model of a humanoid character. For model_url, also check that the character faces the +Z axis.
Name
429 - Too Many Requests
Description
You exceeded your rate limit. Wait, then retry. See Rate limits.

GET/openapi/v1/rigging/:id

Get a Rigging task

Returns a Rigging task by its ID.

Request

GET

/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579

curl https://api.meshy.ai/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579 \
  -H "Authorization: Bearer ${YOUR_API_KEY}"

Response

{
  "id": "018b314a-a1b5-716d-c222-2f1776f7f579",
  "type": "rig",
  "status": "SUCCEEDED",
  "created_at": 1747032400453,
  "progress": 100,
  "started_at": 1747032401314,
  "finished_at": 1747032418417,
  "expires_at": 1747291618417,
  "task_error": null,
  "consumed_credits": 5,
  "result": {
    "rigged_character_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Character_output.fbx?Expires=...",
    "rigged_character_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Character_output.glb?Expires=...",
    "basic_animations": {
      "walking_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin.glb?Expires=...",
      "walking_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin.fbx?Expires=...",
      "walking_armature_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin_armature.glb?Expires=...",
      "running_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin.glb?Expires=...",
      "running_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin.fbx?Expires=...",
      "running_armature_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin_armature.glb?Expires=..."
    }
  }
}

Parameters

Name
id
Type
path
Description
The task ID from the create response.

Returns

The Rigging task object.

DELETE/openapi/v1/rigging/:id

Delete a Rigging task

Permanently deletes a Rigging task, including its models and data. You can't undo a delete.

Request

DELETE

/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579

curl --request DELETE \
  --url https://api.meshy.ai/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579 \
  -H "Authorization: Bearer ${YOUR_API_KEY}"

Response

// 200 OK on success, with an empty body.
//
// 409 Conflict when the task is IN_PROGRESS. The task keeps running:
{
  "message": "Task is IN_PROGRESS and cannot be deleted. Credits for a task the worker has already started are not refundable; wait for it to reach SUCCEEDED, FAILED or CANCELED, then delete it."
}

Path parameters

Name
id
Type
path
Description
The ID of the task to delete.

Task status

Deleting a PENDING task refunds the credits it used when you created it.

An IN_PROGRESS task can't be deleted. The request returns 409 Conflict, and the task keeps running. Meshy doesn't refund a task that has started, so deleting it would cost you both the credits and the result. Wait for it to reach SUCCEEDED, FAILED, or CANCELED, then delete it.

Deleting a task in a final status (SUCCEEDED, FAILED, or CANCELED) doesn't refund its credits.

Returns

200 OK when the task is deleted, or 409 Conflict when the task is IN_PROGRESS.

GET/openapi/v1/rigging

List Rigging tasks

Returns a paginated list of your Rigging tasks, newest first. To page through the list, use page_num and page_size.

Tasks you create with the API stay in the API and don't appear in My Assets in the web app. To find a task whose ID you no longer have, use this endpoint.

Request

GET

/openapi/v1/rigging

curl "https://api.meshy.ai/openapi/v1/rigging?page_num=1&page_size=20" \
-H "Authorization: Bearer ${YOUR_API_KEY}"

GET/openapi/v1/rigging/:id/stream

Stream a Rigging task

Streams a Rigging task's updates as Server-Sent Events (SSE).

Request

GET

/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579/stream

curl -N https://api.meshy.ai/openapi/v1/rigging/018b314a-a1b5-716d-c222-2f1776f7f579/stream \
-H "Authorization: Bearer ${YOUR_API_KEY}"

Response Stream

// Error event example
event: error
data: {
  "status_code": 404,
  "message": "Task not found"
}

// Message event examples illustrate task progress.
// These examples are shortened. Each event holds the full task object.
event: message
data: {
  "id": "018b314a-a1b5-716d-c222-2f1776f7f579",
  "progress": 0,
  "status": "PENDING"
}

event: message
data: {
  "id": "018b314a-a1b5-716d-c222-2f1776f7f579",
  "progress": 50,
  "status": "IN_PROGRESS"
}

event: message
data: { // Example of a SUCCEEDED task event, with the same fields as the Rigging task object
  "id": "018b314a-a1b5-716d-c222-2f1776f7f579",
  "type": "rig",
  "status": "SUCCEEDED",
  "created_at": 1747032400453,
  "progress": 100,
  "started_at": 1747032401314,
  "finished_at": 1747032418417,
  "expires_at": 1747291618417,
  "task_error": null,
  "consumed_credits": 5,
  "result": {
    "rigged_character_fbx_url": "https://assets.meshy.ai/.../Character_output.fbx?...",
    "rigged_character_glb_url": "https://assets.meshy.ai/.../Character_output.glb?...",
    "basic_animations": {
      "walking_glb_url": "https://assets.meshy.ai/.../Animation_Walking_withSkin.glb?...",
      "walking_fbx_url": "https://assets.meshy.ai/.../Animation_Walking_withSkin.fbx?...",
      "walking_armature_glb_url": "https://assets.meshy.ai/.../Animation_Walking_withSkin_armature.glb?...",
      "running_glb_url": "https://assets.meshy.ai/.../Animation_Running_withSkin.glb?...",
      "running_fbx_url": "https://assets.meshy.ai/.../Animation_Running_withSkin.fbx?...",
      "running_armature_glb_url": "https://assets.meshy.ai/.../Animation_Running_withSkin_armature.glb?..."
    }
  }
}

Parameters

Name
id
Type
path
Description
The task ID from the create response.

Returns

A stream of Rigging task objects as Server-Sent Events.

Each event holds the full task object, in the same shape the Get endpoint returns. While the task is PENDING or IN_PROGRESS, its result fields don't have values yet.

The Rigging task object

A Rigging task object describes the rigging of one character. It holds the status, the progress, and the output files when the task succeeds.

Properties

Example Rigging Task Object

{
  "id": "018b314a-a1b5-716d-c222-2f1776f7f579",
  "type": "rig",
  "status": "SUCCEEDED",
  "created_at": 1747032400453,
  "progress": 100,
  "started_at": 1747032401314,
  "finished_at": 1747032418417,
  "expires_at": 1747291618417,
  "task_error": null,
  "consumed_credits": 5,
  "result": {
    "rigged_character_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Character_output.fbx?Expires=...",
    "rigged_character_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Character_output.glb?Expires=...",
    "basic_animations": {
      "walking_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin.glb?Expires=...",
      "walking_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin.fbx?Expires=...",
      "walking_armature_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Walking_withSkin_armature.glb?Expires=...",
      "running_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin.glb?Expires=...",
      "running_fbx_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin.fbx?Expires=...",
      "running_armature_glb_url": "https://assets.meshy.ai/0630d47c-84b8-4d37-bc02-69e45d9272c1/tasks/018b314a-a1b5-716d-c222-2f1776f7f579/output/Animation_Running_withSkin_armature.glb?Expires=..."
    }
  }
}

Name
id
Type
string
Description
The task ID. Treat it as an opaque string, and don't rely on its format.
Name
type
Type
string
Description
The task type, always rig.
Name
status
Type
string
Description
The task status, one of PENDING, IN_PROGRESS, SUCCEEDED, FAILED, or CANCELED.
Name
progress
Type
integer
Description
How much of the task is done, as a percentage. It's 0 until the task starts and 100 when it succeeds.
Name
created_at
Type
timestamp
Description
Time the task was created, in Unix milliseconds.
Name
started_at
Type
timestamp
Description
Time the task started, in Unix milliseconds. It's 0 until the task starts.
Name
finished_at
Type
timestamp
Description
Time the task finished, in Unix milliseconds. It's 0 until the task finishes.
Name
expires_at
Type
timestamp
Description
Time the task's result files expire, in Unix milliseconds. After this time, Meshy can delete the files.
Name
task_error
Type
object
Description
The error details when the task fails. It's null unless the status is FAILED. See Errors.
Name
consumed_credits
Type
integer
Description
The number of credits the task used. Present when the status is PENDING, IN_PROGRESS, or SUCCEEDED. It's 0 for a FAILED task, because Meshy refunds the credits when a task fails.
Name
result
Type
object
Description
The output file URLs. Until the task succeeds, each URL is an empty string, and basic_animations is null.
- Name
  rigged_character_fbx_url
  Type
  string
  Description
  Download URL for the rigged character as an FBX file.
- Name
  rigged_character_glb_url
  Type
  string
  Description
  Download URL for the rigged character as a GLB file.
- Name
  basic_animations
  Type
  object (optional)
  Description
  Download URLs for the default walking and running animations.
  Name
  walking_glb_url
  Type
  string
  Description
  The walking animation with skin, as a GLB file.
  Name
  walking_fbx_url
  Type
  string
  Description
  The walking animation with skin, as an FBX file.
  Name
  walking_armature_glb_url
  Type
  string
  Description
  The walking animation's armature, as a GLB file.
  Name
  running_glb_url
  Type
  string
  Description
  The running animation with skin, as a GLB file.
  Name
  running_fbx_url
  Type
  string
  Description
  The running animation with skin, as an FBX file.
  Name
  running_armature_glb_url
  Type
  string
  Description
  The running animation's armature, as a GLB file.
Name
preceding_tasks
Type
integer
Description
The number of tasks ahead of this one in the queue. The value is meaningful only while the task is PENDING. The field is left out when the value is 0.