Keyboard Shortcuts¶

Complete reference of keyboard shortcuts and mouse interactions in LUC3D.

Shortcuts are editable

Every shortcut below is defined in Help ▸ Settings ▸ Keyboard Shortcuts and most are rebindable — click a shortcut, press your new key(s), and Apply. Multi-key sequences and chords are supported. A handful of core bindings are fixed. Overrides are saved in your browser.

Modifier keys

Shortcuts are shown with Ctrl. On macOS, use Cmd wherever Ctrl appears (LUC3D treats them as the same "Mod" key).

Key	Action
`Space`	Play / Pause
`Left`	Previous frame
`Right`	Next frame
`Alt`+`Left`	Previous user-labeled frame
`Alt`+`Right`	Next user-labeled frame
`Home`	Jump to first frame
`End`	Jump to last frame
`Ctrl`+`Shift`+`J`	Go to a specific frame number

View Controls¶

Key	Action
`+` / `=`	Zoom in all views
`-`	Zoom out all views
`0`	Reset zoom to fit
`V`	Cycle single-camera view (next camera)
`G`	Return to grid view (all cameras)
`Shift`+`R` + `Left` / `Right`	Rotate the active video (hold)
`I`	Toggle info panel
`\`	Toggle 3D viewport
`Ctrl`+`J`	Collapse / show timeline

Instance Operations¶

Key	Action
`N`	Add new instance
`Ctrl`+`I`	Add instance (smart positioning)
`Ctrl`+`C`	Copy selected instance
`Ctrl`+`V`	Paste instance into the focused video
`Del` / `Backspace`	Delete selected instance
`Shift`+`Del`	Delete instance from all cameras (cascade)
`Tab`	Cycle through instances in current frame
`Esc`	Clear selection / cancel operation

Grouping¶

Grouping links the same individual across camera views. Enter assignment mode by clicking an unlinked instance, then click its counterparts in the other views.

Key	Action
`Shift`+`G`	Group the selected instances
`Shift`+`U`	Ungroup / unlink the selected group
`Enter`	Confirm group / edit group
`Esc`	Cancel group editing

Note

c still works as a legacy "confirm group from assignment mode" key, but Shift+G is the current grouping shortcut.

Triangulation & Tracking¶

Key	Action
`T`	Triangulate current frame
`Shift`+`T`	Track current frame
`Ctrl`+`Shift`+`T`	Track all frames
`Ctrl`+`Shift`+`I`	Open the Tracking Wizard
`F`	Find matching instance across cameras

Track & Identity Assignment¶

Select a group first.

Key	Action
`1` – `9`	Assign identity 1–9 to the selected group
`Shift`+`1` – `Shift`+`9`	Assign track 1–9 (propagates across the group)

Visibility Toggles¶

Key	Action
`U`	Toggle user keypoints
`P`	Toggle predicted keypoints
`R`	Toggle reprojections
`E`	Toggle error visualization

File¶

Key	Action
`Ctrl`+`S`	Save project
`Ctrl`+`O`	Load single session folder
`Ctrl`+`,`	Open Settings

Help¶

Key	Action
`?`	Show keyboard shortcuts overlay

Mouse Interactions¶

On Keypoint Nodes¶

Gesture	Action
Click + drag	Move keypoint
`Alt` + drag	Move entire instance (preserves relative positions)
Right-click	Cycle visibility state (visible → occluded → hidden)
Double-click (predicted / reprojected)	Convert to an editable user instance

On Empty Space¶

Gesture	Action
Drag	Pan (when zoomed in)
Double-click	Reset zoom to fit
Scroll wheel	Zoom in/out

On Timeline¶

Gesture	Action
Click	Jump to frame
Drag	Scrub through frames
`Shift` + drag	Range selection
Scroll wheel	Zoom timeline
Middle-click drag	Pan timeline