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Construction Lines - Accurate Cad Modelling Add-On For Blender

CAD Modelling for Blender

Overview And Key Functions

Construction Lines is a tool for accurate CAD style modelling. Build snappable guide points and edges, draw lines and primitive shapes in place, automatically create faces in closed geometry, precisely move objects and rotate geometry around a scene and cut-through meshes with extrude.

Guide edges and points allow for a construction workflow where guides are set and models are then constructed within these guides. The guides won't interfere with model geometry and can be toggled off and on when required. Guides edges will disappear when working outside of Construction Lines and neither Guide Edges nor Guide Points will be rendered.

Construction Lines allows for rectangles, circles, and arcs to be drawn in place from precise snap points on existing geometry or guides. These can be drawn from anywhere on a 3D model without the need for Blender's 3D cursor to define an Add location. Drawing shapes onto existing faces will automatically cut into the existing face.

Construction Lines works seamlessly between Object and Edit modes in Blender.

Full Documentation and Installation Instructions here

FAQs here

If you come from software packages such as SketchUp this is a perfect way to get started with Blender

NOTE: Construction Lines is currently in Beta and is regularly updated with fixes and improvements.

Price Reduced in Beta - Buying Construction Lines in beta will also entitle you to future versions when released.


**New Features (version 0.9.5) - Rotations & Extrude (with cut-through) 




Cut into existing faces


Guide Edges & Points



Drawing Lines

Drawing Shapes In Place

Precise Object Moving

Feature List

  • Create snappable guide edges and points
  • Precisely measure distances
  • Build rectangles, circles and arcs anywhere in your scene
  • Draw lines simply by clicking and dragging in the 3D viewport
  • Lines will automatically fill in faces where geometry is closed
  • Use lines or shapes to cut into or divide existing geometry
  • Build lines, shapes and guides to exact size with numeric input (including mathematical operators * / + -)
  • Limit drawing and movement to the X, Y or Z  axes
  • Auto snap to Perpendicular edge direction and edge extensions
  • Accurate object movement with snap points or numeric input
  • Create faces from a list of selected snap points (vertex, edge, edge center, face)
  • Cut into existing geometry by drawing onto existing faces (Construction Lines will automatically create the extra required geometry), allowing shapes to be extruded in and out of existing meshes.
  • **New features - Extrude and cut-through meshes, object rotations, horizontal guides and direction locks.



Version 0.9.52 - Current Version

Release Notes:

Updates & Bug Fixes:

  • Hotfix for a bug in face creation


Version 0.9.51

Release Notes:

Updates & Bug Fixes:

  • Modal events which are fired too quickly are now consumed, which improves freezing issues (especially in Blender 2.92). Can be turned off in preferences if required.
  • Circle drawing will now orient to the face it's being drawn over
  • Arcs can now be drawn in any direction (not just locked to x, y, z axes) so can be aligned with any face rotation
  • Can now use viewport navigation widget
  • Fixed bug when drawing a shape onto an existing face, when lose geometry is already on the face (face wouldn't split properly)
  • Improved face finding in concave faces
  • Changed face select/highlight to an outline only
  • Extruding a face will now show  a wireframe of the extrusion path
  • Can now use Mac Cmd key with Z to undo
  • Preference for toolbar icon spacing (issue on Macs with icon scaling)
  • Fixed issue with Edit mode automatically being entered after adding new geometry (in Object mode)
  • Fixed issue when using undo outside of Construction Line, which would reactivate Construction Lines incorrectly, so it was no longer usable.
  • Added a new preference to turn off dashed line overlays. This sometimes causes viewport performance issues on older Macs 


Version 0.9.5

Release Notes:

Updates & Bug Fixes:

  • New toolbar to replace context menu
  • New Object mode rotation function for single or multiple objects
  • New construction guide select and move - move the whole guide or drag an end
  • New construction guide rotation
  • New Guide intersection points
  • New Face extrude and cut-through (Blender 2.91+ and interim only until Extrude Manifold is fixed) from within CL (See Known Issues)
  • New Selection mode for selecting objects to move and rotate and selecting faces to extrude/cut-through
  • New direction constraints so that measurements and lines can be constrained to any arbitrary axis
  • New Horizontal guides which can be dragged from any edge and remain parallel to the starting edge. Includes a new preference to set the default length
  • New global axes snapping. Limits to visible axes (controlled in overlay) There is also a preference to turn on and off.
  • Can now set a default tool for CL start
  • Face center dots are now shown so that face split will be more apparent
  • Returns previous context settings (edit selection mode, etc.)
  • Objects or faces already selected in normal Blender modes will remain selected when entering CL
  • Fixed when switching between Workspaces whilst CL is running
  • Fixed bug when entering negative numbers in imperial mode
  • Fixed bug when adding geometry to an existing mesh, outside of an existing face - face geometry was being removed
  • Changed - CL stays remains active even after pressing Esc. To exit completely use either shift + Esc, the exit button, or click another Blender tool
  • Fixed CL remaining active in either Object Mode or Edit Mode after exiting CL in the opposite mode
  • Fixed issue with calling undo where undo history was taken outside of CL start
  • Fixed issue with line drawn shapes not cutting into existing face correctly

Known Issues:

  • Extrude: There seems to be some issues with the way the Exact boolean solver works so sometimes cutting back into an existing mesh leaves artifacts.
  • When installing/updating CL in preferences,  sometimes random errors are thrown by Blender, either when trying to enable CL or when first trying to start CL. This happens mainly on Mac computers. Simply restart Blender to fix.

Version 0.9.41

Release Notes:

Updates & Bug Fixes:

  • Fixed failure to split face when drawing lines onto an existing face
  • Fixed bug where shapes could not split an existing face, after the face had already been split by a line
  • Normals of new shape or line drawn faces are now correctly oriented to view
  • Display text now displays the current modelling mode (Object or Edit mode)


Version 0.9.4

Release Notes:

Features & Updates:

  • New feature to allow for circle, rectangle and line-drawn faces, to cut holes into existing faces. New geometry is automatically created to allow this to happen away from existing edges.
  • Big improvement to edge snapping, snap point no longer runs away from the cursor
  • Changed lower limit to guide scale in preferences to 0.0001
  • Guide edges now have a scaling preference. The value is from 1-5
  • New text display in the bottom left of Viewport to show which tool/action is currently running
  • Support now for Blender 2.9

Bug Fixes:

  • Fixed Arc direction snapping and locking
  • .(dot) on the Numpad now works correctly for decimal input (azerty keyboard issues)
  • Fixed issue with Construction Lines not working after loading a file which has been saved during Construction Lines use. A running flag was saved into the file, so Construction Lines thought it was still running
  • Fixed issue when creating a new object, deleting it and undoing the action multiple times. Construction Lines on occasion would still keep a reference to some deleted objects
  • Improved face finding and creation on existing meshes
  • Fixed issues when axis snap overrides snapping to a geometry point. These two snaps work together now
  • Calling undo whilst in edit mode will now remain in edit mode rather than object mode
  • Fixed issue when using imperial units sometimes failing with multiple digits before a decimal place, in numerical input


Version 0.9.3

Release Notes:

Features & Updates:

  • Snapping can now occur when line/tape is dragged perpendicular or is an extension to an edge (snap is highlighted for both cases - pink for perpendicular and purple for edge extension)
  • Numeric input is now triggered after the Enter key is pressed. This allows for the Numpad and number row to be used for camera orientation during normal operation. Pressing Enter again, after typing a value, will apply the number/expression to the current operation
  • Select a guide edge and create true geometry for use outside of CL using the context menu (hold Shift and click guide edge to select. The guide will change to an orange colour when selected )
  • Added new preference to override Unit Length with Unit Scale when adding guides and new geometry (this is useful when working with custom scales)
  • Added new preference to set guide scale. This will affect all new guide points. Existing guides can be updated by using Scale All from the context menu
  • Default scale for guide points is now smaller
  • 3D mouse events are now passed through to Blender, so using a 3D mouse to navigate should now be possible
  • Strength of axis snapping has been reduced, allowing for greater freedom of movement when drawing and measuring

Bug Fixes:

  • Fixed OpenGL issue with dashed tape measure not displaying on some Apple Mac computers
  • Fixed bug when calling undo multiple times, where undo will lead outside of current Blender context and cause a crash
  • Fixed issue with correct measurement display when changing length units
  • Fixed bug which allowed some non-numeric values to be used in metric mode input, causing a crash
  • Fixed issue with numeric input when using Imperial units and typing a number with greater than one decimal place as the first value
  • Mouse clicks outside of viewport area are now handled correctly (either passed through to Blender or ignored)
  • RGB values for guide colour in preferences are now correctly limited
  • Numerous performance and stability improvements along with lots of minor fixes


Version 0.9.2

Release Notes:

  • Big performance improvements when cutting into existing geometry
  • Fixed stability issues when using shapes to cut into existing geometry


Version 0.9.1

Release Notes:

Minor update

Please note that upgrading from version 0.9.0 requires the removal of version 0.9.0 from Blender before installing any new version.

  • Dimension input now allows for Imperial values (when Blender's Unit System is set to Imperial) - Values can be written in multiple ways eg. 12'1" 3/8, 12'1, 12' 3/8, 12. Decimals can be used for the first value. Will work with either Feet or Inches set as the Length Unit
  • Hold Ctrl and using the mouse wheel will allow for changes in circle/arc segments and will also automatically add guide point divisions to the current guide edge - Whilst dragging a guide edge use Ctrl+Mouse Wheel to increase/decrease the number of guide divisions
  • A guide point is now added to the start of a guide edge
  • Bug fix to arc and circle when using with existing geometry face - was not cutting correctly - NB. This is a patch fix, the face finding and face intersection system will be re-written for the next Construction Lines Version
  • Bug fix to measurement scale - was not previously taking into account user-entered Unit Scale, only unit type scale


Version 0.9.0 -  Initial Beta Release

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Construction Lines - Accurate Cad Modelling Add-On For Blender

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