k3d

Octodraw User Manual

This manual covers installation, navigation, selection, tools, panels, and workflows for Octodraw.

Installation and launch

Windows (ZIP / MSI / MSIX)

1. ZIP: unzip the distribution archive.
2. MSI/MSIX: install the package from the release artifacts.
3. Run octodraw-jre.cmd to use the bundled runtime, or octodraw.cmd to use a system Java.
4. Optional (ZIP only): run octodraw.install.cmd to add Octodraw to PATH and register .octd files.

Linux (TAR.GZ recommended)

1. Extract the .tar.gz distribution archive (preferred, preserves executable flags).
2. If you used a ZIP, make the launcher executable: chmod +x octodraw-jre octodraw-editor.
3. Run ./octodraw-jre for the bundled runtime, or ./octodraw-editor for system Java.

macOS (TAR.GZ recommended)

1. Extract the .tar.gz distribution archive (preferred, preserves executable flags).
2. If you used a ZIP, make the launcher executable: chmod +x octodraw-jre octodraw-editor.
3. Run ./octodraw-jre for the bundled runtime, or ./octodraw-editor for system Java.

Launch commands

The desktop launcher supports commands and flags:

edit --file <path> [--size WIDTHxHEIGHT]   Open or create a model file
edit --plugins-dir <path>                 Override plugins folder
groovy <script>                           Run a Groovy script file
version                                  Show version information
update                                   Download and replace the editor jar
help                                     Show help

You can also pass a .octd path directly (the launcher converts it into --file).

Plugins location

• Default plugin folder: plugins/ next to the application.
• Override the location with: --plugins-dir /path/to/plugins.

Files and autosave

• Default model file: octodraw.octd in the current working folder.
• Open a specific file with: --file /path/to/model.octd.
• Octodraw autosaves whenever geometry or settings change.
• Model files store: geometry, objects, camera, lighting, shadow settings, units, snap radius, and grid spacing.

UI overview

• Viewport: the 3D drawing surface.
• Floating toolbars: Construction, Modification, Architecture, Voxel, and Actions.
• Toolbars are movable, stay top-aligned by default, and wrap to the next row when the window is too narrow.
• Tool buttons are icon-only; hold hover briefly to see the popover label.
• Right panels: selection, object info, objects list, model settings, polyline settings, architecture settings, lighting, plugins.
• Status bar: current tool, status message, snap info, cursor, and numeric input.
• Command palette: search and run tools and commands (Ctrl+Shift+P).
• Undo/Redo: Ctrl+Z / Ctrl+Y (or Ctrl+Shift+Z).

Panels are collapsible: double-click a panel title bar to toggle its content. Collapse/expand keeps the title bar anchored in place. Keyboard focus is panel-aware: typing in focused fields stays in UI controls, while viewport shortcuts apply when the cursor is over the canvas.

Architecture tools brief

• Architecture elements are parametric objects stored in architecture groups.
• Main tools: Wall, Slab, Stair, Add Hole, Window Frame, Door Frame.
• Architecture defaults and selected-element parameters are edited in the Architecture Settings panel.
• You can edit architecture element parameters by selecting the element/group; entering group edit mode is not required for parameter updates.
• Wall and stair generation are contour/path driven, with automatic rebuild after parameter changes.

Navigation (camera)

• Orbit: right mouse drag.
• Pan: Shift + right mouse drag.
• Zoom: mouse wheel (moves the camera along the view direction).
• Camera target: shown as an orange cross in the scene.

Selection

• Click to select edges, faces, objects, dimensions, and texts.
• Shift-click: add to selection.
• Ctrl-click: remove from selection.
• Double-click an object: enter object edit mode.
• Double-click a face: select coplanar faces.
• Triple-click a face or edge: select connected geometry.

Window selection

• Drag left-to-right: select items fully inside the window.
• Drag right-to-left (dashed outline): select intersecting items.
• Hold Alt while starting selection to force 2D window selection and skip direct picking.

Volume selection

• Click empty space once to set a first corner.
• Click a second point to select everything inside that 3D volume.

Selection in voxel groups

• In a voxel group, selection targets voxels directly (not generated faces/edges).
• Click toggles voxel selection; Shift/Ctrl and window/volume selection still apply.
• Delete removes selected voxels.
• Move/Copy works on selected voxels using integer voxel offsets in local voxel space.

Snapping and guides

Octodraw snaps to multiple inference targets for precision:

• Grid intersections and grid lines.
• Line endpoints and midpoints.
• Points along line segments.
• Faces and ground plane intersections.
• Grid guides and axis guides.

Guides help establish temporary reference planes or axes:

• G: create a grid guide at the current snap point.
• T: create an axis guide at the current snap point.
• Esc (Select tool): clear all guides.

Snap radius and grid spacing are configurable in Model Settings.

Numeric input

• While a tool is active, typing a number updates the current measurement.
• Backspace clears the input buffer; Enter commits it.
• Ctrl+N opens a numeric input popup at the cursor.
• Expressions using + - * / are supported (example: 12.5/2).

Objects (groups and prototypes)

Objects let you reuse geometry and isolate edits.

• Create an object prototype from selection: Ctrl+G or Ctrl+O.
• The selection is replaced by a new instance.
• Objects panel lists prototypes and instance counts.
• Double-click a prototype in the list to place a new instance.
• Delete a prototype only when it has no instances.
• Renaming a selected object updates the prototype name.
• Double-click an instance to edit the prototype (changes apply to all instances).
• Glue to surface keeps objects aligned to a picked surface during moves.

Hotspots and visual programming (dynamic objects)

Hotspots are parametric control handles used inside object prototypes and on object instances.

• A prototype defines geometry + hotspots + hotspot bindings.
• Each instance stores its own hotspot positions.
• Instance geometry is recomputed from the prototype baseline using per-instance hotspot values.

Core workflow

1. Enter object edit mode (double-click an instance).
2. Use the Hotspot action button, then click in the viewport to place a hotspot.
3. In Hotspot Settings, choose:
   • name,
   • operation,
   • shape,
   • color.
4. Select geometry and click Attach Selection to bind it to the selected hotspot.
5. (Optional) Select multiple hotspots, then click Attach Selection on one hotspot to bind hotspot-to-hotspot dependencies.
6. (Optional) Click Pick Reference for operations that need a center/reference.
7. Exit object edit mode, then drag hotspot handles on instances to drive per-instance deformation.

Hotspot operations

• MOVE: translate attached geometry.
• STRETCH: stretch attached geometry with vertex-aware behavior.
• SCALE: scale around reference (or origin when no reference is set).
• ROTATE: rotate around reference.
• MULTIPLY_LINEAR: replicate attached geometry along hotspot span.
• MULTIPLY_VOLUMETRIC: replicate attached geometry in a filled extent volume.
• MULTIPLY_ROTATE_2D: replicate along an arc around reference.
• MULTIPLY_ROTATE_3D: replicate along a spiral-like path around reference with height progression.

Hotspot shapes and colors

Available shapes:

• triangle up,
• square,
• circle,
• diamond,
• triangle down.

You can set shape/color globally as defaults (no hotspot selected) or per selected hotspot.

Notes

• Multiply operations generate derived instance geometry at runtime from bindings.
• For predictable results, bind explicit geometry (edges/faces) before using multiply operations.
• Hotspot binding state is saved with the model and restored on reopen.

Tools

Select

• Default tool for selection and multi-select.
• Input: left-click for single select; drag for window/crossing selection; click empty space twice for volume selection.
• Modifiers: Shift adds, Ctrl removes, Alt forces 2D window select; Esc clears guides and selection.

Line

• Click to start a line chain; each click adds another segment.
• Line tool creates edges only and does not auto-create faces.
• Enter finishes the current chain and keeps the tool active.
• Esc exits to Select.
• Input: left-click to place each segment endpoint.
• Modifiers: numeric input allowed for segment length.

Construction Line

• Draws one segment per two clicks and does not auto-chain to the next segment.
• Tool stays active after each segment so you can place independent construction lines quickly.
• Enter clears an in-progress segment.
• Esc exits to Select.
• Input: left-click start, left-click end.

Voxel

• Places one voxel per click on ground/surface context.
• If no voxel group is active, Octodraw auto-creates one and enters voxel edit mode.
• New voxels use the voxel group color.
• Esc exits to Select.
• Input: left-click to place.

Voxel Volume

• Fills a rectangular 3D volume of voxels from two opposite corners.
• First click sets corner A, second click sets corner B and commits.
• If no voxel group is active, Octodraw auto-creates one and enters voxel edit mode.
• Enter clears the current draft; Esc exits to Select.
• Input: left-click corner A, left-click corner B.

Voxel Frame

• Same two-corner workflow as Voxel Volume, but creates only boundary edge voxels of the box.
• If no voxel group is active, Octodraw auto-creates one and enters voxel edit mode.
• Enter clears the current draft; Esc exits to Select.
• Input: left-click corner A, left-click corner B.

Wall

• Adds architecture wall segments (thickness, height, inclination from Architecture Settings).
• First click sets segment start, second click sets end and creates one wall segment.
• Tool chains by default: each next click continues from the previous endpoint.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter finishes the current chain; Esc exits to Select.

Slab

• Creates a rectangular slab from two opposite corners.
• Slab thickness comes from Architecture Settings.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter clears the current draft; Esc exits to Select.

Stair

• Builds a stair object in four picks:
  1. first contour corner,
  2. opposite contour corner,
  3. walking line start,
  4. walking line end (commit).
• Stair height, step count, and support thickness come from Architecture Settings.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter resets the current draft; Esc exits to Select.

Add Hole

• Cuts a rectangular hole in the nearest compatible wall from two opposite corners.
• Hole selection/deletion workflow:
  • selecting and deleting a hole contour removes the hole definition from the wall;
  • deleting generic generated wall faces/edges is blocked to preserve parametric architecture integrity.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter clears the current draft; Esc exits to Select.

Window Frame

• Creates a rectangular window frame from two opposite corners.
• Frame depth and width come from Architecture Settings.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter clears the current draft; Esc exits to Select.

Door Frame

• Creates a rectangular door frame from two opposite corners.
• Frame depth and width come from Architecture Settings.
• If no architecture group is active, Octodraw auto-creates one and enters architecture edit mode.
• Enter clears the current draft; Esc exits to Select.

Rectangle

• Click to set a corner; click to finish the rectangle.
• Creates edges and a face on the best-fit plane.
• Input: left-click two corners.
• Modifiers: numeric input allowed for side length.

Surface Rectangle

• Click a surface to set plane and origin; click to finish the rectangle.
• Creates edges and a face aligned to the picked surface.
• Input: left-click on a face, then left-click to set size.

Quad

• Click four corners to create a quadrilateral face.
• Input: four left-clicks to define corners.

Circle

• Click center, then click radius to create a circular face.
• Input: left-click center, left-click radius.

Linear Dimension

• Click first measure point.
• Click second measure point.
• Click a third point to position the dimension line.
• The displayed value uses the current model unit.
• Input: three left-clicks (start, end, placement).
• Modifiers: numeric input can override the measured distance.

Text

• Click to place text at the cursor plane.
• Edit content, size, and screen/model mode in the Selection panel.
• Input: left-click to place.
• Modifiers: edit text, size, and screen/model toggle in Selection panel.

Push/Pull

• Click a face to start; click again to set the extrusion distance.
• Input: left-click face, left-click to confirm distance.
• Modifiers: numeric input overrides distance.

Move

• Click a reference point, then click a destination.
• Ctrl toggles copy mode (if enabled, copies instead of moving).
• In voxel groups, selected voxels move/copy on integer voxel offsets.
• Input: left-click start, left-click end.
• Modifiers: Ctrl toggles copy mode; numeric input overrides distance.

Rotate

• Click to set a pivot; click again to set the rotation.
• Ctrl toggles copy mode (if enabled, duplicates before rotating).
• Input: left-click pivot, left-click to set angle.
• Modifiers: Ctrl toggles copy mode; numeric input overrides angle.

Scale

• Click to set a pivot; click again to set the scale.
• Ctrl toggles copy mode (if enabled, duplicates before scaling).
• If the reference direction is axis-aligned (X, Y, or Z), scaling is constrained to that single axis (squash/stretch).
• Otherwise scaling uses the existing plane/uniform constrained behavior.
• Input: left-click pivot, left-click to set scale.
• Modifiers: Ctrl toggles copy mode; numeric input overrides factor.

Stretch

• Move only the selected vertices or faces while preserving unselected geometry.
• Input: left-click reference, left-click destination.
• Modifiers: numeric input overrides distance.

Paint

• Click a face to apply the active color.
• Use the Color action button to pick the active color.
• In voxel groups:
  • if voxels are selected, Paint recolors only selected voxels;
  • if no voxels are selected, Paint applies the color to the whole voxel model.
• Input: left-click face to paint.

Object

• Places object prototypes into the scene after choosing one in the Objects panel.
• Input: left-click to place the selected prototype instance.

Architecture tools (detailed, tool by tool)

Architecture workflow context

• Architecture tools operate on architecture groups.
• If a required architecture group is missing, creation tools can auto-create one and continue.
• The Architecture Settings panel shows either default construction values (no architecture element selected) or selected-element values (when exactly one architecture element is selected).
• Parameter changes trigger a live rebuild of the selected architecture element.

Wall tool

• Purpose: create multi-segment walls using chained picks.
• Input flow:
  • click first wall point,
  • click end point to create one segment,
  • continue clicking to chain additional segments.
• Enter: finish current chain and keep Wall tool active.
• Esc: cancel and return to Select.
• Driven by panel parameters:
  • wall thickness,
  • wall height,
  • wall inclination,
  • exterior/interior colors.
• Wall joins are rebuilt in 3D when neighboring segments meet.

Slab tool

• Purpose: create rectangular slab geometry from two corners.
• Input flow:
  • click first slab corner,
  • click opposite corner to commit.
• Enter: clear current draft.
• Esc: cancel and return to Select.
• Driven by panel parameters:
  • slab thickness,
  • slab top/bottom/side colors.

Stair tool

• Purpose: create ribbon-style stairs from a contour and a tread path.
• Input flow:
  • pick a closed contour polyline (preferred: whole polyline/group pick),
  • pick an open tread-line polyline.
• The generator divides the tread path by step count, builds per-step orientation from each local segment, trims each step to contour intersections, and builds tread/support geometry.
• If side cross-lines meet before contour intersection, the step section collapses to a triangle automatically.
• Support and backface are generated as a continuous ribbon with special handling at the first/last steps.
• Rail grid options:
  • left and right rails can be toggled independently in Architecture Settings,
  • rails are generated at +1, +2, +3, +4 model units above each step top edge.
• Driven by panel parameters:
  • stair height,
  • stair steps,
  • support thickness,
  • left/right rail enable,
  • tread/support colors.

Add Hole tool

• Purpose: cut rectangular holes in compatible walls.
• Input flow:
  • click first corner on/near wall face,
  • click opposite corner to commit.
• If a wall is selected, hole is added to that wall; otherwise nearest compatible wall is used.
• Tool is restricted to wall-only architecture groups.
• Enter: clear current draft.
• Esc: cancel and return to Select.

Window Frame tool

• Purpose: create a parametric rectangular window frame.
• Input flow:
  • click first frame corner,
  • click opposite corner to commit.
• Frame is built on the picked construction plane.
• Driven by panel parameters:
  • frame depth,
  • frame width,
  • frame color.
• Enter: clear current draft.
• Esc: cancel and return to Select.

Door Frame tool

• Purpose: create a parametric rectangular door frame.
• Input flow:
  • click first frame corner,
  • click opposite corner to commit.
• Frame is built on the picked construction plane.
• Uses the same frame parameters as Window Frame:
  • frame depth,
  • frame width,
  • frame color.
• Enter: clear current draft.
• Esc: cancel and return to Select.

Editing architecture elements

• Select an architecture element/group, then adjust parameters in Architecture Settings.
• Walls/slabs/stairs/frames update in place when values change.
• For stairs, rail toggles and colors are also editable post-creation.

Actions and panels

Actions (toolbar)

• Cleanup: split intersections and re-weld edges.
• Delete: delete current selection.
• Flip Faces: reverse the orientation of selected faces.
• Color: open the paint color picker.
• Hotspot: start hotspot placement (click in viewport to place).
• Voxelize Faces: convert selected mesh faces into voxels.
  • Works from any mesh context.
  • If no voxel group is active, Octodraw creates one and enters it.
  • Generated voxels use the target voxel-group color.
• Lighting: toggle the Lighting panel.
• Plugin Manager: open the Plugin Manager panel. Shortcut notes: Ctrl+L runs Cleanup; Delete removes selection; flip/color/voxelize are toolbar/command-palette actions.

Selection panel

• Counts for edges, faces, voxels, hotspots, objects, dimensions, and texts.
• Text fields to edit text content and size.
• Toggle for screen-aligned vs model-aligned text. Input: click fields to edit; checkbox toggles screen-aligned text.

Object Info panel

• Shows selected object name and edit state.
• Rename objects and toggle Glue to surface. Input: click name field to edit; checkbox toggles glue.

Objects panel

• Lists object prototypes and instance counts.
• Double-click a prototype to place an instance.
• Delete a prototype only when it has no instances. Input: double-click to place; Delete Prototype button removes selection (when allowed).

Model Settings panel

• Unit name and unit size for measurements.
• Grid size (spacing).
• Snap radius (snap tolerance). Input: type values in fields; drag Snap radius slider.

Hotspot Settings panel

• Shows either:
  • default hotspot settings (when no hotspot is selected), or
  • selected hotspot settings.
• Controls:
  • hotspot name,
  • operation,
  • shape,
  • color (text field + picker),
  • attached geometry counters,
  • reference state.
• Actions:
  • Attach Selection
  • Select Attached
  • Pick Reference
  • Clear Reference
  • Add At Cursor
  • Delete Selected

Lighting panel

• Directional, ambient, specular, and shadow controls.
• Shadow bias, normal bias, PCF mode, dithering, and cascades toggle. Input: drag sliders and toggles for live updates.

Plugin Manager panel

• Add plugin URLs or local paths.
• Download, enable/disable, and reload plugins.
• View load errors in the panel log. Input: type a URL/path, click Add; use Download/Reload buttons and enable checkboxes.

Command palette

Open with Ctrl+Shift+P and search for tools, panels, and view commands. The palette also exposes plugin commands when available. Input: type to filter, Enter to run the highlighted command.

Useful voxel commands:

• Edit> New Voxel Group: create a voxel group and enter edit mode.
• Edit> Voxelize Faces: voxelize selected faces into a voxel group.

Built-in console (dev)

Octodraw includes a persistent Groovy console for power users. Start it using the launcher command:

edit --file path/to/model.octd

In the console:

• Type :help for meta commands.
• Type :examples for snippets.
• Use app.run { ... } to mutate the model safely. Input: Enter submits when syntax is complete; Up/Down navigates history if the buffer is empty; Ctrl+Up/Down always navigates history.

Common meta commands:

• :help / :examples
• :exit to quit the app
• :history to list prior commands
• :perf to show memory, disk, threads, and CPU stats
• :objects to list top-level objects
• :list to inspect bound variables
• :line, :poly, :circle to draw geometry

Useful bindings:

• app, scene, selection, console
• pluginHost, lighting, shadow, lightingCtl
• camera, cameraTarget, cameraCtl
• status, unit, save, version

Plugins

Octodraw loads Groovy plugins from the plugins folder at startup and via the Plugin Manager.

• Use the Plugin Manager to add, download, enable/disable, and reload plugins.
• Plugin tools appear in the toolbar and command palette.
• For development details, see PLUGIN_DEVELOPMENT.md.

Voxel workflow (recommended)

1. Start from mesh geometry or an empty file.
2. Create a voxel group (Edit> New Voxel Group) or just start with a voxel tool (auto-creates group).
3. Build with:
   • Voxel for single blocks,
   • Voxel Volume for solid box fills,
   • Voxel Frame for box edge structures.
4. Refine with Select + Move/Copy + Paint at voxel level.
5. Convert mesh patches with Voxelize Faces when needed.
6. When ready for classic mesh editing, select voxel group(s) and ungroup (Ctrl+Shift+G) to explode into static faces/lines.

Tips and troubleshooting

• If a panel field is focused, move the cursor over the viewport to apply canvas shortcuts (Esc, Delete, tool keys).
• If snapping is too aggressive, reduce Snap radius in Model Settings.
• If guides clutter the view, press Esc in Select mode to clear them.
• If a plugin fails to load, open Plugin Manager and read the error log.

For keyboard shortcuts, see SHORTCUTS.md.

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