Freeform shapes from Bezier curves
3D sketcher
Sketch directly on a face or the ground plane with the Pen and Rectangle tools, then extrude, revolve, or loft your profile into a solid.
The sketcher lets you draw a 2D profile in 3D space — on the ground plane or right on the face of an existing part — and turn it into geometry. There is no separate flat drawing canvas: all sketching happens in the live 3D scene, so your profile is always anchored to a real plane in your model.
Reach for it when a primitive won't do: custom outlines, lettering-style cutouts, lathe-turned bodies, swept paths, and tapered or twisted extrusions. Once a profile is drawn you choose how it becomes solid — push it out (extrude), spin it around an axis (revolve), or skin a surface across a stack of profiles (loft).
How to use it
Pick a sketch starter
Pick a sketch starter from the shapes palette: Sketch (Extrude), Sketch (Revolve), or Sketch (Wire).
Drop onto the viewport
Drag the tile onto the viewport. Drop on empty space to sketch on the ground plane; drop on an existing face to sketch on that face. This drops you into sketch mode.
Choose a drawing tool
Choose a drawing tool from the left toolbar: Pen (P) for free contours, or Rectangle (R). Use Select (V) to grab and adjust points, and Rotate (E), Scale (Y), or Mirror (X) to transform your selection.
Refine points
Refine points if needed: with anchors selected, the sketch HUD lets you switch a point between Vertex (sharp corner), Smooth (symmetric handles), and Asymmetric (independent handles). The HUD also toggles Fill / Line and opens Snap settings.
Finish the sketch
Finish the sketch with (Enter), or throw it away with . A Sketch (Extrude) profile becomes a solid pushed out by its depth; a Sketch (Revolve) profile spins into a lathe-turned body.
Re-open a sketch
To re-open a sketch later, select its part and use (Tab).
Loft several profiles
To loft: create two or more Sketch (Extrude) profiles, them, then in the group's Combine section set Style to Loft — the app skins a surface across the stacked profiles.
Tips
- All sketching is 3D — there is no separate 2D editor. Your sketch always lives on a real plane (the ground or a picked face) in the scene.
- Extrude and Revolve are sketch shapes in their own right; Loft is different — it's a group combine style, so you group several sketch profiles and switch the group to Loft.
- The Loft option only appears in the Style dropdown when the group qualifies (two or more sketch profiles and no conflicting solids); otherwise the group falls back to Sharp.
- Loft has its own controls: a Smooth toggle (curved vs. straight/ruled skin), Sections / gap and Samples / profile sliders for resolution, and Closed loop to skin the last profile back to the first.
- Use Sketch (Wire) when you want a path/curve rather than a filled profile; it has its own Select and Pen tools and is finished with .
Try it in your browser
Open CubbyCAD and put 3D sketcher to work — it runs in the browser, no install.