How to Fillet Entities in BricsCAD

Quick answer: FILLET connects two entities with an arc of a specified radius, creating a rounded edge. Works on line segments, straight polyline segments, arcs, circles, rays, and infinite lines, and, distinct from CHAMFER (covered elsewhere in this hub, which requires non-parallel entities), also works on parallel lines, rays, and infinite lines. TRIMMODE, the same variable used for chamfering, controls whether filleted entities keep their original length or get trimmed or lengthened to the fillet arc’s endpoints.

Filleting Two Entities or Polyline Segments

1. Launch FILLET. You’re prompted to select the first entity, or choose fillet Settings…, Polyline, Radius, Trim, Undo, or Multiple.
2. Choose Radius. You’re prompted for the fillet radius.
3. Type a value; you’re prompted again to select the first entity, now showing the new radius.
4. Select the first entity or polyline segment. You’re prompted to select the second entity (hold Shift while selecting to create a corner instead).
5. Select the second entity or polyline segment; the fillet is created.

Filleting All Vertices of a Polyline

1. Launch FILLET. You’re prompted to select the first entity, or choose an option including Polyline.
2. Choose Radius. You’re prompted for the fillet radius.
3. Type a value; you’re prompted again, now showing the new radius.
4. Choose Polyline. You’re prompted to select a 2D polyline to fillet.
5. Select the polyline; every vertex fillets.

When filleting a polyline, you can fillet just the segments between two selected ones, or the entire polyline at once.

Filleting Two Parallel Lines

1. Launch FILLET. You’re prompted to select the first entity.
2. Select the first line. You’re prompted to select the second entity (hold Shift while selecting to create a corner instead).
3. Select the second line; the fillet is created.

Frequently Asked Questions

Can FILLET work on parallel lines, unlike CHAMFER? Yes, that’s a genuine difference between the two, FILLET can connect parallel lines, rays, and infinite lines, while CHAMFER requires non-parallel entities.

Do I need to set a radius before filleting two parallel lines? The procedure for parallel lines doesn’t require setting one first, select the two lines directly.

Can I fillet an entire polyline at once instead of just two segments? Yes, choose the Polyline option and select the polyline; every vertex fillets in one step.

What controls whether my filleted entities keep their original length? TRIMMODE, the same variable that controls this for chamfered entities.