How to cut or trim a line that is too long in BricsCAD?

ByCADbrief Staff

Short Answer

Use the TRIM command to cut a line that is too long in BricsCAD. The fastest professional method is to start TRIM, select the cutting edge, press Enter, then click the excess part of the line to remove it. This works best when the line actually crosses a valid boundary; it will not trim isolated geometry.

What You Need to Know Before

Warning: If the line does not physically intersect the cutting edge, BricsCAD may not trim it unless the trim behavior allows projected intersections. Also, objects on locked layers or inside certain block contexts cannot be edited directly, which often looks like the trim command is failing.

How to Trim a Long Line in BricsCAD

  • Command: TRIM

  • Shortcut: TR

  • Quick Steps:

    1. On the Ribbon > Home tab > Modify panel, click Trim, or type TR and press Enter.
    2. Select the object(s) that will act as the cutting edge, then press Enter.
    3. Click the portion of the long line you want to remove.

  • Use the Project option if the objects do not visibly intersect in the current view or plane.

Variables & Settings

  • Key Setting: Project option in the TRIM command

  • Expert Setting: The Project option controls whether BricsCAD trims only at actual intersections or also at projected intersections. If trimming fails on objects that seem aligned but do not truly cross in 3D or UCS space, set Project appropriately during the command.

Why it Fails

  • Cause 1 (Geometry): The line does not intersect the selected cutting edge, or the objects are not coplanar.
  • Cause 2 (Layers/Locks): The line or boundary is on a locked layer, or the object is inside a block or external reference.
  • Cause 3 (Command/Logic): The wrong cutting edge was selected, or the trim operation expects a real intersection but projection is not enabled.

Quick Fix & Best Practice

  • Quick Fix: Run TRIM, reselect the correct cutting edge, and use the Project option if the line does not trim at first.
  • Manager’s Verdict: Use TRIM for precise 2D cleanup and drafting edits. If you only need to shorten a line to meet another object without selecting a removable side, EXTEND or grip editing may be faster in production work.

FAQ

Can I trim multiple lines at once in BricsCAD?
Yes, select multiple cutting edges and trim several lines in one command.

Why won’t BricsCAD trim a line that looks like it touches another object?
Because the objects may not truly intersect or may be at different elevations.

Can I use trim on polylines as well as lines?
Yes, TRIM works on lines, polylines, arcs, and many other editable objects.

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