EzyCad 2D Sketching Guide
This guide covers all 2D sketching tools and operations in EzyCad. For the main usage guide (workflow, 3D modeling, file operations, etc.), see usage.md.
Table of Contents
2D Sketching
Basic Tools
Sketch Operations
Define operation axis - Mirror sketches, revolve edges or faces.
Sketch snapping
While you draw or place points in sketch mode, EzyCad helps you align to existing geometry. Snap dist and Snap guide mode are in the Options panel; guide color is in Settings -> Sketch (see usage-settings.md).
Snap distance |
Larger Snap dist values let snaps engage from farther away (screen pixels, converted to the sketch plane at the cursor). |
Snap guides |
Snap guide mode: Traditional (local markers at guide intersections), Fullscreen (view-spanning axis lines), or Both. |
Axis alignment |
Near a snap target, the pick can align to that point’s X or Y on the sketch plane; guides show which axis is active. When both axes align to the same point, the cursor locks to that vertex. |
Mid-point snap (Add node) |
A click near a straight edge (not at its ends) snaps onto the segment and splits it at commit time (see Add node tool). Separate from vertex lock. |
Other visible sketches |
Nodes from other visible sketches are projected onto the current sketch plane and act as snap targets (same distance rules). Useful for multi-sketch layouts and tools such as polar duplicate that pick sketch points. |
Angle constraint: When a line or add-node rubber band has an active angle constraint, vertex and axis snap may be disabled or relaxed so the typed angle stays exact (see each tool’s section).
Tips:
For precise corners, approach a vertex until both horizontal and vertical guides appear, then click.
Automatic edge midpoints are snap targets but do not show + markers and are not listed under Nodes in the Sketch List (that list is user-placed points only).
Line Edge Creation Tools
EzyCad provides tools for creating individual line edges in sketch mode, allowing you to build complex geometries one edge at a time.
Single Line Edge Tool
The single line edge tool allows you to create straight line segments between two points.
Features:
Two-point creation |
Click to set the start point, then click to set the end point |
Real-time preview |
See the line shape while moving the mouse |
Precise length control |
Use the distance input dialog (Tab key) for exact line lengths |
Angle constraint |
Use the angle input dialog (Shift+Tab) to constrain the line to a specific angle |
Snap support |
Automatically snaps to existing nodes and geometry (disabled when angle constraint is active) |
Dimension annotations |
Optional length dimensions can be displayed |
How to use:
- Select the Line Edge tool from the toolbar
Click to set the start point of the line
Move the mouse to see a preview of the line
Click to set the end point, or use input dialogs for precise control:
Press Tab to enter an exact length value
Press Shift+Tab to enter an exact angle value (in degrees)
When using both: apply angle (Shift+Tab) first, then distance (Tab).
The line edge will be created and added to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise length control |
Shift+Tab |
Open angle input dialog to constrain the line to a specific angle (after first point is set) |
Escape |
Cancel the current line creation |
Enter |
Finalize the line (if using distance or angle input) |
Right-click |
Complete the current line and start a new one |
Angle Constraint:
After setting the first point, press Shift+Tab to open the angle input dialog
Enter the desired angle in degrees (0 deg = horizontal right, 90 deg = vertical up, counterclockwise)
Once the angle is entered, the line segment is constrained to that angle
You can still move the mouse to adjust the length while maintaining the angle
The distance input (Tab) can still be used in combination with the angle constraint
Order when using both: When requiring both an angle and a distance constraint, apply the angle constraint first (Shift+Tab), then the distance constraint (Tab).
Note: When an angle constraint is active, snapping to nodes is disabled to maintain the angle precision
Tips:
Use the snap feature to create lines that connect precisely to existing geometry
Lines can be used as construction geometry or as part of your final design
The line tool works in any sketch plane
Multiple line edges can be created in sequence by right-clicking after each line
Multi-Line Edge Tool
The multi-line edge tool allows you to create multiple connected line segments in a single operation, making it efficient for drawing continuous paths, polylines, or complex connected geometries.
Features:
Continuous edge creation |
Click multiple points to create a chain of connected line segments |
Real-time preview |
See each edge shape while moving the mouse before clicking |
Precise length control |
Use the distance input dialog (Tab key) for exact edge lengths |
Angle constraint |
Use the angle input dialog (Shift+Tab) to constrain the current edge to an angle (in degrees) |
Snap support |
Automatically snaps to existing nodes and geometry |
Distance annotations |
Real-time distance display for the current edge being drawn |
Flexible finalization |
Continue adding edges until you right-click to finalize the entire sequence |
How to use:
- Select the Multi-line Edge tool from the toolbar
Click to set the first point (start of the first edge)
Move the mouse to see a preview of the first edge
Click to set the second point (end of first edge, start of second edge), or use input for precise control:
Press Tab to enter an exact length value
Press Shift+Tab to enter an exact angle (in degrees) for the current edge
When using both angle and distance: apply angle (Shift+Tab) first, then distance (Tab).
Continue clicking to add more connected edges, each new click starts a new edge from the previous edge’s end point
Press Right-click to finalize the entire multi-line sequence and add all edges to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise length control of the current edge |
Shift+Tab |
Open angle input dialog to constrain the current edge to an angle (after first point is set) |
Escape |
Cancel the entire multi-line creation operation |
Enter |
Finalize the current edge length (if using distance input) and continue to the next edge |
Right-click |
Finalize the entire multi-line sequence and complete the operation |
Workflow details:
Each click after the first creates a new edge connected to the previous edge’s end point
After entering a distance with Tab, the tool automatically starts a new edge from the end of the previous one
The distance annotation shows the length of the edge currently being drawn
All edges in the sequence are added to the sketch together when you right-click to finalize
Tips:
Use the snap feature to create multi-line edges that connect precisely to existing geometry
Multi-line edges are ideal for creating continuous paths, outlines, or complex connected shapes
The tool works in any sketch plane
Keep clicking to add more edges - there’s no limit. For example, you can click 3 times to create 2 edges, or 10 times to create 9 edges. All edges remain temporary until you right-click, which adds all of them to your sketch at once
If you make a mistake, press Escape to cancel the entire sequence and start over
The last edge in the sequence will be removed if it hasn’t been finalized (no end point set) when you right-click
Comparison with Single Line Edge Tool:
Single Line Edge: Creates one edge at a time, finalizes automatically after two points
Multi-Line Edge: Creates multiple connected edges in sequence, requires right-click to finalize
Use single line edges when you need individual disconnected segments
Use multi-line edges when you need a continuous chain of connected segments
Circle Creation Tools
EzyCad provides a method for creating circles in sketch mode using the center-radius approach.
Center-Radius Circle Tool
The center-radius circle tool allows you to create circles by defining a center point and a radius point.
Features:
Two-point creation |
Click to set the center, then click to set the radius |
Real-time preview |
See the circle shape while dragging the radius point |
Precise radius control |
Use the distance input dialog (Tab key) for exact radius values |
Snap support |
Automatically snaps to existing nodes and geometry |
How to use:
- Select the Circle tool from the toolbar
Click to set the center point of the circle
Move the mouse to see a preview of the circle
Click to set the radius point, or press Tab to enter an exact radius value
The circle will be created and added to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise radius control |
Escape |
Cancel the current circle creation |
Enter |
Finalize the circle (if using distance input) |
Tips:
Use the snap feature to create circles that are precisely positioned relative to existing geometry
The circle tool works in any sketch plane
Circles can be used as construction geometry or as part of your final design
Three-Point Circle Tool (Planned Feature)
Status: Not yet implemented
The three-point circle tool is planned for future development. This feature would allow creating circles by defining three points that lie on the circle’s circumference.
Planned Features:
Three-point creation |
Click three points that lie on the circle’s circumference |
Automatic center and radius calculation |
The system would compute the center and radius from the three points |
Geometric validation |
Ensure the three points are not collinear |
Note: 
The toolbar icon exists but the functionality is not yet implemented.
Circle Creation Workflow
The circle tool follows this workflow:
Activate Tool: Select the circle creation mode
Point Placement: Click to place the center point, then click to place the radius point
Preview: See real-time preview of the circle as you move the mouse
Finalization: Click to complete the circle creation
Integration: The circle becomes part of the sketch and can be used for further operations
Common Operations with Circles:
Extrusion |
Select the circle face and extrude to create cylindrical shapes |
Boolean Operations |
Use circles in cut, fuse, or common operations |
Pattern Creation |
Use circles as the basis for polar arrays or other patterns |
Dimensioning |
Add radius or diameter dimensions to circles |
Error Handling:
Coincident Points |
The system prevents creation of circles with zero radius |
Invalid Geometry |
Circles that would be too small are rejected |
Snap Integration |
Use existing snap points for precise circle placement |
Arc Segment Creation Tool
The arc segment tool allows you to create circular arc edges by defining three points that lie on the arc: a start point, a middle point, and an end point.
Features:
Three-point creation |
Click to set the start point, then the middle point, then the end point |
Real-time preview |
See the arc shape while moving the mouse after setting the first two points |
Automatic finalization |
The arc is automatically created and added to your sketch after the third point is clicked |
Circular arc |
Creates a smooth circular arc that passes through all three points |
Snap support |
Automatically snaps to existing nodes and geometry |
Unique points |
All three points must be different (cannot be coincident) |
How to use:
- Select the Arc Segment tool from the toolbar
Click to set the start point of the arc (first point)
Click to set a point on the arc between start and end (middle point)
Move the mouse to see a preview of the arc
Click to set the end point of the arc (third point)
The arc segment will be automatically created and added to your sketch
Point order:
First click |
Start point - where the arc begins |
Second click |
Middle point - a point that lies on the arc between start and end |
Third click |
End point - where the arc ends |
Keyboard shortcuts:
Escape |
Cancel the current arc creation (clears all points) |
Note |
The arc is automatically finalized after the third point, so no manual finalization is needed |
Tips:
The three points define a unique circular arc that passes through all of them
Use the snap feature to create arcs that connect precisely to existing geometry
The arc tool works in any sketch plane
Arc segments can be used as part of closed shapes that form faces
The middle point helps define the arc’s curvature and direction
All three points must be unique - clicking the same point twice will be ignored
Technical details:
The arc is created using the three points to define a circle, then trimming it to the arc segment
Internally, the arc is represented as two connected edges for proper topology
Arc segments can be combined with straight edges to create complex closed shapes
Comparison with Circle Tool:
Circle Tool: Creates a full circle from center and radius point (2 points)
Arc Segment Tool: Creates a partial arc from three points on the arc (3 points)
Use circles when you need a complete circular shape
Use arc segments when you need a curved edge that’s part of a larger shape
Rectangle and Square Creation Tools
EzyCad provides three tools for creating rectangular shapes in sketch mode: square, rectangle from two points, and rectangle with center point.
Square Tool
The square tool allows you to create perfect squares by defining a center point and an edge midpoint.
Features:
Two-point creation |
Click to set the center point, then click to set the midpoint of one edge |
Real-time preview |
See the square shape while moving the mouse |
Perfect square |
Automatically ensures all sides are equal length |
Orientation control |
The square’s orientation is determined by the direction from center to edge midpoint |
Precise size control |
Use the distance input dialog (Tab key) for exact side lengths |
Snap support |
Automatically snaps to existing nodes and geometry |
How to use:
- Select the Square tool from the toolbar
Click to set the center point of the square
Move the mouse to see a preview of the square
Click to set the midpoint of one edge (this defines both the size and orientation), or press Tab to enter an exact side length value
The square will be created with four edges and added to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise side length control |
Escape |
Cancel the current square creation |
Enter |
Finalize the square (if using distance input) |
Tips:
The distance from center to edge midpoint determines half the side length
Use the snap feature to create squares that are precisely positioned relative to existing geometry
The square tool works in any sketch plane
Squares automatically form closed faces that can be extruded
Rectangle Tool (Two Points)
The rectangle tool allows you to create rectangles by defining two opposite corners.
Features:
Two-point creation |
Click to set the first corner, then click to set the opposite corner |
Real-time preview |
See the rectangle shape while moving the mouse |
Precise size control |
Use the distance input dialog (Tab key) for exact dimensions |
Snap support |
Automatically snaps to existing nodes and geometry |
Automatic corner calculation |
The system automatically calculates the other two corners |
How to use:
- Select the Rectangle tool from the toolbar
Click to set the first corner point
Move the mouse to see a preview of the rectangle
Click to set the opposite corner point, or press Tab to enter exact distance values
The rectangle will be created with four edges and added to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise dimension control |
Escape |
Cancel the current rectangle creation |
Enter |
Finalize the rectangle (if using distance input) |
Tips:
The two points define opposite corners of the rectangle (diagonal)
The rectangle edges are automatically aligned with the coordinate axes
Use the snap feature to create rectangles that are precisely positioned relative to existing geometry
The rectangle tool works in any sketch plane
Rectangles automatically form closed faces that can be extruded
Rectangle Tool (Center Point)
The rectangle with center point tool allows you to create rectangles by defining a center point and a corner point.
Features:
Two-point creation |
Click to set the center point, then click to set a corner point |
Real-time preview |
See the rectangle shape while moving the mouse |
Centered creation |
The rectangle is centered on the first point |
Precise size control |
Use the distance input dialog (Tab key) for exact dimensions |
Snap support |
Automatically snaps to existing nodes and geometry |
How to use:
- Select the Rectangle with Center Point tool from the toolbar
Click to set the center point of the rectangle
Move the mouse to see a preview of the rectangle
Click to set a corner point (defines both size and orientation), or press Tab to enter exact distance values
The rectangle will be created with four edges and added to your sketch
Keyboard shortcuts:
Tab |
Open distance input dialog for precise dimension control |
Escape |
Cancel the current rectangle creation |
Enter |
Finalize the rectangle (if using distance input) |
Tips:
The rectangle is centered on the first point you click
The distance from center to corner determines the rectangle’s dimensions
Use the snap feature to create rectangles that are precisely positioned relative to existing geometry
The rectangle tool works in any sketch plane
Rectangles automatically form closed faces that can be extruded
Comparison of Rectangle Tools:
Rectangle (Two Points) |
Define opposite corners - useful when you know the corner positions |
Rectangle (Center Point) |
Define center and corner - useful when you want the rectangle centered on a specific point |
Square |
Always creates a perfect square - use when you need equal sides |
Slot Creation Tool
The slot tool allows you to create an oblong or oval-shaped slot with rounded ends. A slot consists of two semicircular arcs connected by two straight parallel edges.
Features:
Three-point creation |
Click to set the first arc center, then the second arc center, then a point to define the radius |
Real-time preview |
See the slot shape while moving the mouse after setting the first two points |
Automatic finalization |
The slot is automatically created and added to your sketch after the third point is clicked |
Rounded ends |
Creates semicircular arcs at both ends with equal radius |
Parallel edges |
The two straight edges connecting the arcs are always parallel |
Precise size control |
Use the distance input dialog (Tab key) for exact dimensions |
Snap support |
Automatically snaps to existing nodes and geometry |
How to use:
- Select the Slot tool from the toolbar
Click to set the center point of the first arc (start of slot)
Move the mouse to see a preview of the first edge
Click to set the center point of the second arc (end of slot)
Move the mouse to see a preview of the slot shape
Click to set a point that defines the radius of the arcs, or press Tab to enter exact distance values
Important: The radius is measured from the second arc center (the point you clicked in step 4) to this third point
This radius determines the cross section: the slot’s cross-section dimension equals 2 * radius
The slot will be automatically created with two arcs and two straight edges and added to your sketch
Point order:
First click: First arc center - the center of the arc at one end of the slot
Second click: Second arc center - the center of the arc at the other end of the slot
Third click: Radius point - defines the radius of both arcs
The distance from the second arc center (second click) to this point determines the arc radius
The slot’s cross section (perpendicular to the slot length) equals twice this radius
Both arcs use the same radius, creating a symmetric slot
Keyboard shortcuts:
Tab |
Open distance input dialog for precise dimension control |
Escape |
Cancel the current slot creation |
Enter |
Finalize the slot (if using distance input) |
Note |
The slot is automatically finalized after the third point, so no manual finalization is needed |
Tips:
The slot length is determined by the distance between the first and second arc centers
The radius of both arcs is determined by the distance from the second arc center to the radius point (third click)
The slot’s cross section (the dimension perpendicular to the slot length) equals 2 * radius
This is because each arc is a semicircle with the specified radius, extending equally in both perpendicular directions
For example, if you click the radius point 3 units away from the second arc center, the slot cross section will be 6 units
Both arcs have the same radius, creating a symmetric slot shape
The slot orientation (which dimension is length vs width/height) is determined by the direction from the first to the second arc center
Use the snap feature to create slots that connect precisely to existing geometry
The slot tool works in any sketch plane
Slots automatically form closed faces that can be extruded
The slot orientation is determined by the direction from the first to the second arc center
Technical details:
Slot structure |
Four edges: two semicircular arcs and two straight parallel edges |
Arcs |
Created using the arc segment functionality |
Straight edges |
Connect the arcs at their endpoints |
Closed shape |
Suitable for face creation and extrusion |
Common use cases:
Creating mounting slots for screws or bolts
Designing elongated holes for adjustment
Creating rounded-end cutouts in parts
Designing slots for sliding mechanisms
Operation Axis Tool
The operation axis tool allows you to define a reference line for mirroring and revolving operations in sketches.
Features:
Two-point definition |
Click to set the start point, then click to set the end point of the axis line |
Real-time preview |
See the axis line while moving the mouse |
Automatic redefinition |
If an axis already exists, clicking again will clear it and start defining a new one |
Mirror operations |
Use the defined axis to mirror selected edges |
Revolve operations |
Use the defined axis to revolve selected edges or faces |
How to Use:
- Select the Operation Axis tool from the toolbar
Click to set the start point of the axis line
Move the mouse to see a preview of the axis line
Click to set the end point to finalize the axis
Once defined, the axis can be used for mirror or revolve operations
Redefining the Axis:
If an operation axis already exists and you click again in operation axis mode, the existing axis will be automatically cleared and you can start defining a new one
Alternatively, use the “Clear axis” button in the options panel to manually clear the axis
Using the Operation Axis: Once an axis is defined, the options panel (under the Sketch operation heading) shows:
Mirror button |
Mirrors selected edges across the operation axis |
Revolve button |
Revolves selected edges or faces around the operation axis |
Revolve angle input |
Set the angle for revolve operations (default: 360 degrees) |
Clear axis button |
Manually clear the current operation axis |
Keyboard Shortcuts:
Escape |
Cancel the current axis definition |
Tips:
The operation axis is a reference line used for geometric transformations
Select edges or faces before using the Mirror or Revolve operations
The axis can be redefined at any time by clicking again in operation axis mode
Use snap points for precise axis placement relative to existing geometry
Dimension Tool
Edge dimension tool creates/removes length dimensions between two sketch nodes.
Features:
Node-pair dimensions |
Dimensions are defined by two sketch nodes |
Fast edge workflow |
Click a straight edge to toggle a dimension between its two endpoint nodes |
Two-node workflow |
Click one node, then a second node, to toggle a dimension between them; after the first node, a preview line follows the cursor (same idea as the line-edge rubber band), so two-node mode is visually distinct from a single edge click |
Selectable/deletable |
Dimension objects can be selected in sketch mode and deleted (for example with the keyboard shortcut d) |
Helpful for verification |
Quickly verify that your sketch has the correct dimensions |
How to Use:
- Select the Edge Dimensions tool from the toolbar
Use either input style:
Edge click: Click a straight edge to toggle the dimension between its endpoints
Node pair: Click node A, then click node B to toggle the dimension between A and B
Click the same edge (or same node pair) again to remove that dimension
To delete directly, select the dimension object and press the delet hotkey d
When to Use:
Design verification |
Check that your sketch dimensions match your design requirements |
Quality control |
Verify measurements before extruding or performing operations |
Learning and debugging |
Understand how your sketch geometry is sized |
Documentation |
Take screenshots with dimensions visible for reference |
Selective display |
Show dimensions only for the node pairs you care about |
Tips:
Dimensions display the distance between the two referenced nodes
Node hover/pick uses normal sketch snap distance rules
This tool is particularly useful when working with precise measurements
Use in combination with the distance input feature (Tab key) when creating edges
Dimensions are for display only and do not constrain the geometry
Toggle dimensions on only the elements you need to reduce visual clutter
Technical Details:
Dimension source |
Calculated from the two referenced nodes |
Unit system |
Displays measurements in the current unit system |
Auto-update |
Dimensions update automatically when geometry is modified |
View-only |
Does not affect the underlying geometry |
Add Node Tool
The Add node tool (toolbar: Add node) adds sketch vertices. What happens on each placement depends on whether you start from an existing node:
First click snaps to an existing node — The tool acts like Line edge for the next step: a rubber-band preview runs from that anchor, and you can enter length and/or angle (Tab / Shift+Tab, same order as line edge) before you place the second point. No new line edge is added to the sketch; only the new node is created at the end of that placement.
First click does not snap to an existing node — The new node is placed at the click on the sketch plane (usual snap rules still apply, e.g. mid-point snap onto a straight edge to split it).
In both cases, Add node never leaves a permanent edge between two clicks the way Line edge does.
What else it does
Mid-point snap / split |
If a click lands near a straight (non-arc) edge (not at its endpoints), the pick snaps onto the segment and that edge is replaced by two meeting at the new vertex. Arc edges are not split this way. |
No stored edge from anchor |
After a two-step placement from an anchor, no sketch edge is created between anchor and new node (unlike Line edge). |
Angle constraint |
With an angle constraint active during rubber-band placement, the next click places the new node along that ray from the anchor; snapping may be relaxed to stay on that direction (similar to the line tool). |
Permanent “+” markers
Nodes you place with Add node are treated as user-placed points. When the sketch is visible, eligible points can show a small + marker in the 3D view so you can see and pick them. Geometry that exists only as automatic edge midpoints for snapping is separate (those nodes are not shown the same way).
How to use
Enter sketch mode and select Add node
on the toolbar.Direct node: Click where you are not snapping to an existing vertex (empty sketch area, or near a straight edge for mid-point snap, etc.). The node is created at the snapped position; mid-point snap on a straight edge splits that edge.
From an existing node (line-edge–like step): Click an existing vertex first so the first click snaps to it. A rubber-band preview runs from that anchor—use Tab / Shift+Tab for length/angle if you want—then click (or confirm) to place the second point. Only a new node is committed; no new edge is stored.
Repeat as needed for more nodes.
Keyboard shortcuts
Tab |
Distance input for rubber-band placement (when an anchor is active). |
Shift+Tab |
Angle input (degrees) for rubber-band placement. |
Escape |
Cancel the current placement or rubber-band step. |
Right-click |
Drop an incomplete rubber-band preview if you started from an anchor and have not placed the second point yet. |
Tips
Prefer Add node when you need extra vertices or edge splits without a new visible segment between the two clicks.
Use Line edge or Multi-line when you want a new edge between two locations.
Add node vs. Line edge
Add node |
Rubber band is for placement only; does not add a permanent edge between the two clicks. |
Line edge |
Two clicks (or numeric input) create a new line edge in the sketch. |
Create Sketch from Planar Face Tool
The create sketch from planar face tool allows you to extract the boundary of a planar face from an existing 3D shape and create a new 2D sketch from it. This is useful for reverse engineering, modifying existing shapes, or creating new features based on existing geometry.
Features:
Face selection |
Click directly on a planar face from an existing 3D shape |
Automatic boundary extraction |
Extracts the outer wire (boundary) of the selected face |
New sketch creation |
Creates a new sketch with the face boundary as the initial geometry |
Planar face requirement |
Only works with planar (flat) faces - curved or complex surfaces are not supported |
Error handling |
Displays an error message if a non-planar face is selected |
How to Use:
Activate Tool:
Click the Create Sketch from Planar Face tool from the toolbarSelect Face: Click on a planar face from an existing 3D shape
The face must be planar (flat) - curved surfaces like cylinders, spheres, or complex surfaces will show an error
The system will automatically extract the outer boundary of the face
Sketch Created: A new sketch is automatically created with:
The face boundary as the initial wire
The sketch plane aligned with the face plane
The sketch name set to “Sketch from face”
Edit Sketch: You can now edit the sketch using standard sketch tools (add edges, modify geometry, etc.)
Requirements:
Planar face only: The selected face must be flat (planar). Common planar faces include:
Flat surfaces on boxes or rectangular shapes
Flat faces on imported STEP/IGES models
Top or bottom faces of extruded shapes
Any face that lies in a single plane
Error Handling:
If you select a non-planar face, you will see an error message: “Error: Selected face is not planar. Please select a planar face.”
The operation will be cancelled and no sketch will be created
Simply select a different face that is planar
Keyboard Shortcuts:
Escape: Cancel the operation (if activated but not yet completed)
Tips:
Use this tool to extract profiles from existing 3D models for modification or reference
The created sketch can be edited, modified, and then extruded to create new features
Useful for reverse engineering or working with imported CAD models
The sketch plane will be automatically aligned with the face plane
After creating the sketch, you can add additional geometry or modify the extracted boundary
The original shape remains unchanged - this tool only creates a new sketch based on the face boundary
Common Use Cases:
Reverse engineering |
Extract profiles from imported 3D models |
Feature modification |
Create a sketch from an existing face, modify it, and extrude to create a new feature |
Reference geometry |
Use existing face boundaries as reference for new sketches |
Model editing |
Extract a face boundary, modify it, and use it in boolean operations |
Workflow efficiency |
Quickly create sketches from existing geometry instead of manually recreating profiles |
Technical Details:
Boundary extraction |
Uses |
Sketch plane |
Determined from the face’s underlying surface geometry |
Supported faces |
Only |
Sketch list |
Created sketch is added and can be managed like any other sketch |
Image underlay
Import a reference image (PNG, JPEG, or BMP) behind a sketch for tracing or alignment. Open Sketch properties from the Sketch List ([P] on the sketch row) or use the underlay controls there after import.
Sketch List shortcuts
Control |
Action |
|---|---|
Underlay checkbox |
Show or hide the underlay for that sketch (only when an image is loaded) |
|
Open Sketch properties for import, calibration, and transform |
Sketch properties — Image underlay
Control |
Action |
|---|---|
Import image… |
Load PNG/JPEG/BMP into the current sketch |
Remove underlay |
Clear the image from the sketch |
White paper -> transparent |
Treat bright pixels as clear (typical for scanned line drawings; turn off for photos) |
Tint visible lines / Line color |
Recolor non-transparent pixels after the white key (default yellow works on dark backgrounds) |
Opacity |
Overall underlay transparency (0–1) |
Calibrate from sketch edges (sketch must be current in the Sketch List):
Button |
Action |
|---|---|
Set X from edge… |
Two clicks along bitmap width (+U), then enter the real drawing distance (same units as sketch dimensions) |
Set Y from edge… |
Two clicks along bitmap height (+V), then enter the drawing distance for Y |
Define underlay datum… |
Two picks on the sketch plane: corner (0,0), then direction along +U (keeps current half width and height) |
After edge calibration, bitmap axes may be non-orthogonal (shear). The Transform sliders (Center X/Y, Half width/height, Rotation) then stay disabled so they do not overwrite that affine fit; use calibration picks or adjust before shear is introduced.
Transform (orthogonal underlay only): sliders and Rotation value adjust center, half extents, and rotation on the sketch plane; changes apply in real time and support undo.
Default underlay highlight tint for new imports: Settings -> Sketch -> Underlay highlight color (see usage-settings.md).