Get the current scene: objects (name/kind/layer/bbox, and the user_text keys and values of any that carry some), layers, selection, bounds, and display mode. Set user text with the setusertext command.

Capture the current 3D viewport so you can see the model. Returns a PNG image. Use after making changes to check the result.

Create a NURBS curve from 3D points [[x,y,z], ...].

kind: 'interp' (curve passes through the points), 'control' (points are control vertices), 'polyline' (straight segments), 'line' (two points).

Create a surface/solid from existing curves (referenced by name).

operation: 'extrude' params: direction [x,y,z] (default [0,0,1]), distance (default 10), cap (bool, default true - closed profiles become solids) 'revolve' params: axis_point, axis_dir, angle (degrees, default 360) 'loft' curves: 2+ profiles in order; params: ruled (bool) 'planar' flat surface from one closed planar curve 'sweep' curves: [profile, rail]

Boolean operation between solids: 'union', 'difference' (targets minus tools), or 'intersection'. Tools are consumed.

Transform objects (by name).

operation/params: 'move' offset [dx,dy,dz] 'copy' offset [dx,dy,dz] 'rotate' center [x,y,z], axis [x,y,z] (default Z), angle degrees 'scale' center, factor (uniform) or factors [sx,sy,sz] 'mirror' plane_point, plane_normal, keep_original (bool)

Select objects by names, kind (curve/surface/solid), or layer name. mode: 'replace', 'add', or 'clear' (clear ignores other args).

Run any Serpentine3D command exactly as if typed in the command line, supplying its interactive inputs in order.

Examples: command='circle', inputs=['0,0,0', '5'] command='extrude', inputs=['Curve 01', '', '20'] (object name(s), then '' to end selection, then distance) command='zoomextents'

Selection prompts accept object names, 'all', or '' to finish. Too few inputs is an error, and so is one left over when the command finishes: the error says which prompt each input answered.

Open Python in a new editable Script draft without executing it.

Existing drafts and geometry are preserved. Scripts can use doc (a working document), geo (geometry helpers), and selected (selected SceneObjects). The user can edit the draft, Run to preview, then Keep or Discard its changes.

Manage layers. action: 'list', 'create', 'rename', 'visible', 'current', 'color' (color as [r,g,b] 0-1), 'assign' (move objects to layer), 'delete', 'style' (how a layer draws: style={linetype, print_width mm (0 = printer default), screen_width px or 'from print', hatch none/lines/cross/solid or a pattern loaded with the hatchpatterns command, hatch_angle degrees, hatch_spacing mm on paper, hatch_color ink/layer/#rrggbb, hatch_background none/layer/#rrggbb (what a cut shows under its hatch), cut_line_width mm on paper round a cut (0 = none), cut_line_color ink/layer/#rrggbb}). A layer can live under another: pass parent to 'create', and name a layer by its path ('Walls::Interior') where two layers share a name.

Add a file to the scene (.serp, .step/.stp, .obj). What is already there stays. The user's view is left alone unless zoom_extents is true.

Export the scene (or current selection) to .serp, .step/.stp or .obj — format chosen by extension.

Measure geometry. what: 'distance' (needs points=[[..],[..]]), 'length', 'area', 'volume', 'bbox', 'centroid' (need targets).

Undo the last operation (or redo with redo=true).

Adjust the viewport. view: top/front/right/left/back/bottom/ isometric/perspective. display_mode: wireframe/shaded/ghosted. zoom_extents fits all objects in view.