Recommended test
Close a small profile, inspect its dimensions and round one suitable corner.
- Choose Sketch mode and an origin plane, then draw a rectangle.
- Select an edge or the rectangle and inspect its dimensions in the sidebar.
- Choose sketch Fillet, pick a corner and apply a small radius.
- Finish the sketch, Push/Pull its closed region and inspect the curved corner.
Work in one sketch plane
Choose Sketch mode, select a plane and use Look at plane to draw straight on. Rectangle, Circle, Line, Arc and Spline create source geometry. For drawing directly on a solid without changing the camera, see face sketching.
Use Smart or Object only snapping to reach existing curves, endpoints and other supported references. Grid only uses the sketch grid. Zoom into a junction if a region does not close.
Choose the curve type
| Tool | Best use |
|---|---|
| Line | Straight boundaries with a known length or angle. |
| Arc | A circular boundary with a constant radius. |
| Spline | A free-form boundary controlled by its control points. |
| Rectangle or Circle | A complete simple profile that can be selected and sized as one shape. |
Press Enter to finish a line or spline drawing without leaving Sketch mode. Escape releases an open spline at its last confirmed point and cancels unfinished gestures. Use Finish sketch when you want to return to 3D.
A spline’s control polygon guides its shape; do not assume each control point lies on the curve. The cage and control-point labels appear while drawing or selecting it. Select the spline again to adjust its points.
Edit precise properties
With Select, click geometry to open its properties in the sketch inspector. Lines have endpoint, length and angle controls; arcs have centre, radius and sweep information; splines expose control-point coordinates. Circle and rectangle sizing keeps their centres fixed. Changing a line’s length or angle keeps its start fixed.
Enter or leaving a valid field applies the edit; Escape cancels that input. Coordinates use the sketch’s U/V directions. Use driving dimensions and constraints when a relationship must remain true during later edits.
Round a sketch corner
Choose Fillet in the sketch rail, hover a sharp corner and click it. Move the pointer to size the preview or enter Fillet radius, then use Apply fillet, Enter or another canvas click.
Line–line, line–arc and arc–arc corners are supported. An intact rectangle can apply the radius to the selected corner or all four. Spline corners and ambiguous multi-branch junctions are not supported. Choose a radius that leaves usable lengths in the adjacent curves.
Select a finished fillet to change its radius. Release fillet retains the curves but removes their linked editing relationship. Sketch Fillet changes the drawing; Edge finish changes a 3D body’s edges.
Trim and check closure
Trim removes the picked section between intersections. Hold Shift with Trim to erase a whole curve or rectangle side. Undo restores a successful trim or erase as one step.
Inspect the committed closed-region count before extrusion. Remove duplicates and tiny overlapping segments; another click near an open endpoint is not a substitute for a snapped connection. Changing the drawing does not automatically update a solid already made from it.