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Is there a way in Blender to achieve some CAD commands like extend lines to the intersection (or nearest) point, or trim/extend to plane?

Like this: http://www.qcad.org/doc/qcad/2.2/reference/en/chapter28.html

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Specifically for the commands you mention there exists a CAD add-on called mesh tinyCAD, allows you to easily do the following things (this is not an exhaustive list):

  • VTX (like _extend):
    • automatically extend edges towards their projected intersection
    • generate a vertex at the intersection of two edges ("weld")
  • V2X:
    • generate an unattached vertex at the projected intersection of two edges
  • XALL:
    • intersects all selected edges.
  • BIX:
    • generates the bisector of two selected edges
  • CCEN:
    • given any three selected vertices (in one object), this can recreate a circular set of vertices of any number and scale.

For questions about the add-on or ideas use the project's issue tracker


For _fillet you can use the bevel command: CtrlShiftB With 1 vertex selected

  • It starts out as a bevel but you can increase the number of segments to turns it into a fillet.
  • Adjust radius
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    $\begingroup$ There are also some built-in features in Blender, which come in handy. Vertex/Edge slide for example can be used to move a vetex / edge by a factor of 0.5 for the midpoint. Turn off clamping to extend. Snapping does unfortunately not work while sliding. $\endgroup$ – CodeManX May 6 '14 at 0:07

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