Start a registration job, then poll action=status until job.state is completed/failed; submitted is not aligned. Reuses the viewer's Rust solvers. auto: level/up-axis yaw sweep then ICP; icp: refine an already close pair; correspondences: fit >=3 non-collinear paired world XYZ landmarks. source_index moves, target_index stays fixed. align_all/refine_all hold target fixed; strategies anchor (each to anchor), nested (grow aligned union), complex (grow with extra hypotheses). For auto/icp, against_all_others matches the moving cloud to the union of all other clouds. No scale/nonrigid estimation. up_axis describes the DATA, not the camera (default y); use z for Z-up scans. Clear temporary selections first. Undo restores transforms from the last accepted agent job. Inspection/capture remain available; geometry refresh waits for alignment. Partial align-all failures are reported per object.

Return an actual PNG of the rendered 3D canvas (maximum 1024 pixels per side) so the agent can visually inspect the result. Requires an active inline viewer or explicit browser fallback.

Release a viewer's local server and temporary data. Does not delete the user's source files. Any active viewer disconnects.

Enable linked side-by-side WebGL views with the same camera (EDL off in split mode); disable restores ordinary rendering. Distance colors left by world-space distance to right: nearest within max_distance, unmatched=NaN; paired uses corresponding decoded order and requires equal counts. Distance limit: one million combined points. Changes mark distances stale; recompute with action=recompute,left= reuses recorded settings. Restored distance fields require an explicit distance computation. No alignment is run.

Control camera keyframes, or model animation when object_index is supplied. Model: list clips, update(index/speed), play, stop (pause), loop(enabled), goto(time in seconds, pauses). GLB/GLTF/FBX/DAE retain supported embedded animation; 3DS is static. With no object_index, manage camera keyframes: Add captures current camera. Update sets segment duration/dwell in seconds. Loop requires enabled; play needs two keyframes; stop restores camera. Returns reusable keyframe poses.

Write the active or named subset to a NEW binary .ply under configured roots (maximum 256 MiB). Preserve decoded RGB, normals, scalar attributes, decoded indices, and original source_row when available (depth raster: pixel_v*width+pixel_u). Coordinates are object-local; header stores local_to_world and source origin. Returns a path, never point data/base64. No overwrite; not a lossless copy of the original file's numeric types.

Inspect loaded geometry and build IDs (Python package/server and actual renderer; renderer_matches_bundle detects an old widget). Read coordinate conventions/units, camera position/direction/rotation center, projection and viewport, object transforms, opacity/color, exposure/background, selection criteria, geometry counts and bounds from the active inline viewer or explicit browser fallback. Times out if no renderer responds. Compare rendered_revision with the submitted revision.

List scenes owned by this MCP process and their local viewer URLs.

Save/restore complete camera, transforms, selection/named subsets, visibility, color, opacity and presentation. Export/import a .json under configured roots to persist after restarting. Reopen identical geometry in the same order before import; import stores a state; restore=True imports and applies it in one call. Existing files are never overwritten. Maximum 20 states, 4 MiB each. JSON does not embed geometry or playback. action=export_models writes all visible models as a new .glb (no name required), including supported native animation clips. GLB excludes Gaussian splats, grid/UI, source-row attributes and point-size settings; use subset PLY for analysis attributes. Export limit 256 MiB.

Name the active selection; retain up to 20 independent subsets. Toggle each name's visibility or activate/focus it. Union/intersection/subtract combine two names from the same source into a new active selection; save it to retain it. Defaults isolate=False and focus=False preserve existing visibility and camera. Empty set results return status=empty, clear the active selection, and cannot export the previous result. Geometry updates expire selections; scene-state export persists them.

Save/restore named camera views for this renderer session; undo the last agent camera change (up to 50). Names are not persisted after closing/reloading the widget. Does not restore geometry or filters.

Add/list/clear visible measurements in scene units. Distance uses start/end XYZ; path_point appends end to the active path; undo removes its last point; close_path toggles closure.

Navigate without UI. Fit tightly; presets use Y-up OpenGL. Orbit angles are degrees. Pan/pivot use world XYZ. Zoom <1 moves closer. Pick uses normalized canvas XY (top-left=0,0) and sets rotation center on visible geometry, like double-click. Origin resets pivot to 0,0,0.

Open local point clouds/meshes/splats/animated models together. Pass scene_id to append while preserving camera and existing objects. Include explicit supporting .bin/textures for GLTF/DAE/FBX; no implicit disk or network reads. Paths must be under configured roots. Returns a persistent scene_id and local URL; inspect to verify loading.

Download one URL or a list of direct HTTP(S) 3D files into one scene; pass scene_id to append. Self-contained models recommended; external resources are not fetched implicitly. Download each file on the local MCP server and open it inline. This makes a network request to the supplied URL and redirects; no browser CORS is needed. Supports the same formats as local files plus gzip. Supply filename for extensionless/signed URLs. Defaults to a 256 MiB transfer/decompressed limit, at most 1 GiB; 30-second socket and 120-second transfer limits. No login/cookies or webpage extraction. Temporary files are deleted when the scene closes.

Project a depth/disparity raster inline using explicit calibration from surrounding files/context. Read viewer://depth-calibration for coefficient ordering and encoding. Calibration dimensions must match the raster; no parameter guessing. Supports NPY/NPZ, TIFF, PNG8/16, EXR, PFM and COLMAP dense .bin. Optional aligned RGB (HxWx3, 0..255), confidence and mask files. Pass scene_id to append without moving the camera. For a COLMAP dense workspace, set path=workspace and colmap_image=exact image name; calibration comes from its undistorted sparse model. Inspect after loading for pixel counts, provenance and projection diagnostics; picks/exports retain original pixel coordinates and raw values.

Pick normalized canvas XY without moving the camera. Returns hit/miss, world XYZ, object and decoded point indices and scalar attributes. Mesh/splat picks may have null indices; never infer object identity from those.

Return one labeled multi-view PNG to choose a useful angle, preserving the original camera. Disable split comparison first. Includes enabled grid, legend and selection summary.

App-only transport: session metadata, pending commands or bounded geometry chunks.

One-step select/isolate/focus with PNG preview. Select all points in an object, or intersect scalar field values, world box [minX,minY,minZ,maxX,maxY,maxZ], and plane halfspace ax+by+cz+d>=0. Creates a reversible highlighted point subset; clear restores prior visibility. Label IDs are numeric, not semantic object names: inspect attributes/pick first. No automatic segmentation; point clouds only. Replaces the previous selection. Disable highlight to preserve original colors. Moving the plane requires another select call.

Set exposure stops, background #RRGGBB, persistent pivot axes, coordinate grid, object/color legend and UI theme. gamma_correction matches the UI toggle: true treats source RGB as linear (extra gamma appearance); false decodes sRGB before shading. Enabled grid/legend are also included in agent PNG captures. Axes may briefly appear during interaction when persistent axes are off.

Partially update camera position, target (rotation center), up or vertical FOV in degrees. Rotation is absolute XYZ Euler degrees; it moves target along camera -Z at the previous pivot distance. Rotation cannot combine with target/up. Fit frames visible geometry, optionally at the new FOV. Returns applied view state.

Set overlay opacity (0..1), visibility, world-unit point size (or point_size_mode=adaptive for a camera-dependent 2/4/8 pixel target; point_size_pixels=1..64 explicitly sets that target and enables adaptive sizing), points/mesh representation, fixed RGB color or original/intensity/scalar coloring. Get object_index, scalar_fields and available_color_modes from inspection; these include palette indices and projected colors when available. Mesh requires faces. Fixed color and color_mode are mutually exclusive.

App-only transport: acknowledge a rendered command result.

Transform one cloud/mesh without changing source files or camera. Translate/scale use vector XYZ; rotate uses vector axis plus angle degrees (90 for quarter turns); quaternion uses XYZW, normalized. Matrix is affine 4x4 COLUMN-MAJOR, matching inspection (transpose row-major UI input). Default composes currentdelta in local space; world uses deltacurrent. pivot=center rotates/scales around the current bounding-box center; explicit XYZ pivot uses the chosen space; omitted pivot is the coordinate origin. Undo restores the last of up to 50 agent edits per object. replace=True sets an absolute transform. Invert/reset act on the current matrix. Inspect local_to_world to verify. Visibility, point size and coloring use set_3d_object.

Replace the existing scene's geometry while preserving its camera. Omitted overlays/vectors are removed. Reuses the active inline viewer or explicit browser fallback.

Visualize up to 20,000 XYZ points, optional RGB (integer 0..255), target overlay, or anchored vector arrows. Use files for larger data; coordinates are not automatically normalized.