Step 1: Upload

The Upload step.

Procedure

1. Select New analysis in the sidebar or in the header.

2. If the file is an STL file, select its unit under STL units: mm, cm, m or in. STEP files carry their own units.

3. Drag the file onto Drop CAD here, or browse, or select the area and choose the file. You can choose several files; they are treated as one assembly.

4. Wait while the file is processed. The progress bar shows the stage: reading, tessellation, topology checks and repair. All of this runs in your browser; the file is not uploaded to a server.

5. When the file has been read, the wizard moves to the Geometry step.

Accepted files

Format	Notes
STEP, STP	Preferred. Units are read from the file. Solids keep their identity, so control surfaces can be assigned.
STL	Each closed shell is treated as a part. Choose the unit before uploading.

Errors

Choose STEP, STP or STL files.

The file has another extension. Export the model as STEP or STL.

OpenCascade could not read this STEP file for repair.

The STEP file is damaged or uses an unsupported schema. Export it again from CAD.

Automatic repair could not identify separate CAD bodies safely.

A body is not a closed solid. Sew the affected part in CAD and export it as a solid.

The geometry check could not finish.

The check failed in the browser. You can continue; the simulation service checks the surfaces again before meshing.