# Tencent Hunyuan 3D 3.1 Smart Topology API

> Hunyuan 3D 3.1 Smart Topology by Tencent retopologizes a GLB or OBJ model into a clean triangle or quad mesh at a chosen polygon density.

Source: https://www.sandbase.ai/models/tencent/hunyuan-3d/3.1/smart-topology
API reference: https://www.sandbase.ai/models/tencent/hunyuan-3d/3.1/smart-topology#api

## Facts

- Provider: Tencent
- Type: Image model
- Model ID: `tencent/hunyuan-3d/3.1/smart-topology`
- Price: $0.75 per run
- Capabilities: 3d to 3d
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Unified Run API: `POST https://api.sandbase.ai/v1/run`

```bash
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "tencent/hunyuan-3d/3.1/smart-topology",
  "model_url": "https://static.sandbase.ai/examples/tencent/hunyuan-3d/3.1/smart-topology/input_input_file_url_0.glb",
  "face_level": "medium",
  "polygon_type": "triangle",
  "input_file_type": "glb"
}'
```

The response returns a run id; poll `GET https://api.sandbase.ai/v1/run/{id}` until the status is `completed` or `failed`.

## FAQ

### How do I call Tencent Hunyuan 3D 3.1 Smart Topology through SandBase?

Create a SandBase API key, then send requests with the model ID "tencent/hunyuan-3d/3.1/smart-topology" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### Do I need a separate Tencent account?

No. One SandBase API key and balance gives you access to Tencent Hunyuan 3D 3.1 Smart Topology and the other models in the catalog; you do not need to sign up with Tencent separately.

## README

### Hunyuan 3D 3.1 Smart Topology
Hunyuan 3D 3.1 Smart Topology by Tencent retopologizes a GLB or OBJ model into a clean triangle or quad mesh at a chosen polygon density.
#### Fields
| Field | Type | Default | Notes |
|---|---|---|---|
| `model_url` | string, required | — | URL of the GLB or OBJ model to retopologize. Max 200MB. |
| `input_file_type` | `glb` / `obj` | `glb` | Format of the input model. |
| `polygon_type` | `triangle` / `quadrilateral` | `triangle` | triangle: triangles only. quadrilateral: mixed quads and triangles. |
| `face_level` | `high` / `medium` / `low` | `medium` | Target polygon density: high keeps more detail, low gives fewer polygons. |
#### Output
- `url`: Main 3D file (GLB unless another export format is selected).
#### Billing
$0.75 per request.
Failed runs are not charged.
#### Also on SandBase
Other Tencent 3D endpoints: `tencent/hunyuan-3d/3.0/image-to-3d`, `tencent/hunyuan-3d/3.1/part`, `tencent/hunyuan-3d/3.1/pro/image-to-3d`, `tencent/hunyuan-3d/3.1/pro/text-to-3d`.