GET STARTED

CAD demo path

Partner-ready walkthrough: extract a CAD file, wrap four-cad.cad_scene.v1, call Rowe, or import a partner feature tree. Matches the repo CAD demo runbook.

1. Extract

POST /api/v1/cad/extract with STEP, IGES, DXF, PDF, SVG, or draw.io.

2. cad_scene

Wrap structure as four-cad.cad_scene.v1 (or import a partner feature tree).

3. Rowe

POST /api/v1/responses with task_type understand, compare, or optimize.

Extract

Terminal

$ curl https://fourechelon.com/api/v1/cad/extract \
    -H "Authorization: Bearer $FOUR_ECHELON_API_KEY" \
    -F "file=@bracket.step" \
    -F "target_contract=both"

Infer on cad_scene

Terminal

$ curl https://fourechelon.com/api/v1/responses \
    -H "Authorization: Bearer $FOUR_ECHELON_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
$     "model": "rowe-1.0",
$     "input": {
$       "task_type": "optimize",
$       "object_id": "bracket",
$       "cad_scene": {
$         "scene_id": "bracket-review",
$         "schema_version": "four-cad.cad_scene.v1",
$         "source_format": "step",
$         "units": "millimeter",
$         "structure": {
$           "kind": "brep",
$           "solids": [
$             {
$               "id": "solid-1",
$               "volume": 1250,
$               "bounding_box": {
$                 "x_min": 0,
$                 "x_max": 120,
$                 "y_min": 0,
$                 "y_max": 55,
$                 "z_min": 0,
$                 "z_max": 25
$               },
$               "faces": [{ "face_type": "plane" }]
$             }
$           ],
$           "features": [
$             { "id": "base_extrude", "feature_type": "extrude", "parameters": { "depth": 25 } }
$           ],
$           "dimensions": [
$             { "dim_type": "linear", "measurement": 120, "text": "120 mm" }
$           ]
$         }
$       }
$     }
$   }'

Partner import (no file)

Terminal

$ curl https://fourechelon.com/api/v1/cad/import-feature-tree \
    -H "Authorization: Bearer $FOUR_ECHELON_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
$     "partner": "adam",
$     "document_id": "doc_123",
$     "feature_tree": []
$   }'

Signed push webhooks: partner CAD webhooks. UI path: Four Cad. Operator runbook in the repo: docs/cad-demo-runbook.md.

Demo video

Twenty-second Remotion walkthrough of extract → cad_scene → Rowe. Fixture numbers stay in the eval sheet — this is narrative, not a benchmark claim.