Choose your version. The browser app is 0.4; Windows remains 0.3. Tools and project formats differ. See version differences.
Recommended test
Check the supported corner combinations, editability, and safety limits.
- Draw a 100 x 60 mm rectangle, choose Fillet, and hover one corner. The corner target should highlight clearly.
- Click the corner, enter 10.000 mm, and choose Apply fillet. The result should remain one closed five-segment contour.
- Undo, repeat, and choose All corners. Four equal tangent arcs should create a closed eight-segment contour.
- Draw two straight lines that share exactly one endpoint. Fillet their junction and confirm the two lines are trimmed to one tangent arc.
- Repeat with a joined line and arc, two arcs, a line and spline, an arc and spline, and two splines. Both source curves should trim to a tangent circular arc.
- After applying a fillet, change Fillet R in Properties. The same fillet should rebuild while both neighbouring curves remain connected.
- Try a radius that consumes an adjoining curve. Cadivari should explain why it cannot fit and leave the sketch unchanged.
- Undo and redo the result, then verify it can be selected as an ordinary connected path for CAM and exported to SVG or PDF.
Create a fillet
Choose Fillet from the CAD rail. Hover a rectangle corner or a junction shared by exactly two line, circular-arc or open-spline entities, then click once to start. Moving the pointer adjusts the radius and shows the exact replacement curves and tangent arc before anything is stored.
Enter a millimetre value at any time. Click the canvas again, press Enter, or choose Apply fillet to commit the valid preview.
Round one or all corners
Selected corner replaces only the highlighted rectangle corner. All corners applies the same radius to all four corners. Cadivari converts the rectangle into ordinary exact lines and circular arcs so the rounded outline behaves like any other connected CAD contour.
Change the radius later
The new fillet arc is selected after creation. Enter a new Fillet R value in Properties and The native OCCT engine re-solves the corner, re-trims both supporting curves, and keeps the same fillet identity. A fillet at the other end of a shared curve stays in place. This relationship is saved with the project and participates in undo and redo.
Dragging an arc handle deliberately releases the fillet relationship and turns it into an ordinary editable arc. This makes a direct geometry edit explicit instead of silently breaking tangency.
Controls
Ready for connected paths and CAM
A fillet is not stored as a visual effect. OCCT trims the source curves and creates an exact tangent circular arc. Multi-span splines may become several exact cubic spline pieces; the shape is preserved. Connected-path analysis, save/open, SVG/PDF export, and CAM consume the same ordinary line, arc and spline geometry shown on the canvas.
Current limits
- Rectangle corners and unambiguous junctions shared by exactly two lines, circular arcs or open splines
- Endpoints must meet; branches, already tangent curves, closed-spline seams and ellipse fillets are not supported
- Radius must be at least 0.1 mm and fit the available curve lengths without crossing the outline
- Detach mirrored or projected geometry and remove constraints on the affected curves before filleting; active Combine or CAM references must also be released
- Fillets retain editable radius relationships. If supporting geometry changes shape independently, recreate the fillet
- Native fillets support offsets of the finished contour; the sharp-base offset option is unavailable
- The installed Windows 0.3 release retains its existing line-and-arc fillet support