# Mocap Studio release notes

Release notes for **AR 51 Mocap Studio**, the Windows and Linux desktop client. Newest release first. (Mocap Studio is the client; the capture server is **Mocap Unleashed**.)

:::note
A few 2.3.1 maintenance builds (2.3.1.6R through 2.3.1.26R) shipped without detailed per-change notes; they're listed with their release dates and a summary for completeness.
:::

## 3.0.2.35R

_2025-12-01 · Windows & Linux · since 2.3.1.26R_

This is a major release. Mocap Studio moves from the 2.3 line to 3.0, adding markerless full-body solving, a new `.gr51` capture workflow, richer camera tools, and Linux support alongside Windows.

### New

- **Full-body character solving.** Live capture now drives a complete humanoid rig — spine, neck, clavicles, arms, and legs — for natural, stable motion out of the box.
- **Open and export `.gr51` captures.** Double-click a `.gr51` file, drag it onto the window, or pass it on the command line to load a capture instantly; imported captures are solved automatically and can be re-exported.
- **Export to FBX, CSV, and GR51.** Send takes straight to your DCC or analysis tool, with progress shown throughout the export.
- **Biomechanics angles in CSV export.** Joint-angle data is now included in CSV output for movement and clinical analysis.
- **Per-person identity.** Assign and display an entity ID or character name per tracked person, so subjects stay clearly labelled across a session.
- **Camera panel search and undistort toggle.** Quickly find a camera in large rigs and switch lens-distortion correction on or off directly on the feed.
- **Phone cameras as capture sources.** Android and Pico phone cameras can be used as capture devices.
- **Server health at a glance.** A new status panel shows whether the capture server is alive and lets you restart it without leaving the app.
- **Linux support.** Mocap Studio now ships as a native Linux build in addition to Windows.

### Improved

- **Smoother, more responsive exports.** FBX and other exports report clear progress and no longer freeze the interface on large takes.
- **Camera calibration and auto-tune.** A guided auto-tune workflow with live progress makes dialing in cameras faster, and the calibration menu now shows full device names.
- **Camera feed accuracy.** Video overlays stay aligned with the 3D view as cameras move, and distortion correction is more faithful to each lens.
- **Character setup that sticks.** Character-to-subject mappings are saved to disk and validated, with clear on-screen feedback when something needs attention.
- **Clearer scene readability.** Person labels hide automatically when a person is hidden, and skeletons in an A-pose are colour-coded so setup state is obvious.
- **Accessibility.** Added colour-vision-deficiency simulation to help verify that the interface is readable for all users.

### Fixed

- Capture no longer stalls when a camera drops offline mid-session.
- Corrected CSV export frame counts and improved consistency of exported data.
- Fixed video-overlay misalignment so animated cameras track the footage correctly.
- Resolved incorrect foot placement caused by faulty capture-bounds and foot-region calculations.
- Fixed finger mapping on humanoid characters.
- Corrected the camera-feed video path on Linux so live feeds display reliably.
- Numerous stability fixes to reduce crashes and unexpected hangs during long sessions.

### Known issues

- Requires a compatible **Mocap Unleashed** capture server; older 2.3-era servers are not supported by this release.
- On Linux, launch Mocap Studio from the installed application entry so `.gr51` file association and camera device access are set up correctly.

## 2.3.1.26R

_2024-11_ — Rebuild to align with the current capture server; no client-side changes in this build.

## 2.3.1.25R

_2024-11_ — Rebuild to align with the current capture server; no client-side changes in this build.

## 2.3.1.13R

_2024-09_ — Rebuild to align with the current capture server; no client-side changes in this build.

## 2.3.1.6R

_2024-09_ — Rebuild to align with the current capture server; no client-side changes in this build.

## 2.3.1.0R

_2024-03 · since 2.3.0.3R_

Opens the 2.3.1 line, carrying forward the 2.3.0 export and character work with fixes for playback and character setup.

### Improved
- **FBX timing.** Exported FBX animation now uses exact per-frame keyframes instead of continuous time, so motion lands on frame boundaries and reimports cleanly.
- **Recording playback.** Playback now also finds footage stored in H.265 folders, so more of your recorded sessions play back without extra setup.

### Fixed
- Fixed finger mapping on MetaHuman characters, which have an extra metacarpal joint that was previously handled incorrectly.

## 2.3.0.3R

_2024-01 · since 2.3.0.0R_

### New
- **Built-in update checker.** Mocap Studio can now check for, download, and install a newer version from within the app.

### Improved
- **Clearer dialogs.** Message dialogs now support an icon, up to three choices, and a remember-my-choice checkbox for smoother confirmations.
- **Ready-to-use characters.** Added iClone and MetaHuman characters with updated textures.

### Fixed
- FBX exports now use the correct right-handed orientation, so motion no longer comes in mirrored in other software.
- Corrected root-joint detection so exported skeletons are rooted correctly.

## 2.3.0.0R

_2024-01 · since 2.2.4.2R_

### New
- **FBX export that works everywhere.** A rebuilt FBX exporter produces files that open correctly across all major DCC and animation software.
- **Motion smoothing.** New Gaussian and Butterworth filtering options clean up captured motion for steadier results.
- **Guided installer.** A proper Windows installer that removes the previous version before installing the new one.
- Added a HandGun prop prefab.

### Fixed
- Corrected viewport field-of-view while streaming, so the live view is right at any camera aspect ratio.

## 2.2.4.2R

_2023-12 · since 2.2.4.0R_

Stability and consistency fixes ahead of the 2.3.0 release.

### Fixed
- Corrected the viewport vertical field-of-view while streaming, so the live 3D view is right at any camera aspect ratio, regardless of the camera-feed aspect ratio.

### Improved
- Cleaner startup with the Unity splash logo hidden.

## 2.2.4.0R

_2023-11 · since 2.2.2.12R_

### New
- **Video playback from JPG image sequences.** Review recorded captures stored as image sequences directly on the timeline.
- **C3D support.** Import and export the C3D format for motion-analysis interchange with biomechanics tools.
- **Open GR51 files from the file menu**, and a recording countdown before takes begin.

### Improved
- **Reworked property grid** for editing settings, with faster editing and clearer controls.
- **Movable pop-up windows** you can drag by their title bar.
- **Camera path and motion visualisation** — richer trails showing tracked-marker and camera movement over time.
- More reliable timeline playback for recorded footage.

## 2.2.2.12R

_2023-04 · since 2.2.2.8R_

### New
- **Camera heatmaps and motion trails.** Visualise camera coverage and the paths of tracked markers over time.
- **Object-detection overlays.** Show detected objects on the camera feed, with custom prop visuals.
- **GR51 files** can be opened from the file menu.
- **Search bar** for finding items quickly, plus a recording countdown before takes start.

### Improved
- Camera feeds now show FPS and resolution and handle different aspect ratios (including vertical and 9 MP cameras) correctly.
- Zoom controls for the camera view; movable pop-up windows.
- Keyboard shortcuts for toggling heatmaps, skeleton heatmap, and the grid.

### Fixed
- Fixed timeline and playback glitches during video review.
- Fixed marker-trail rendering and full-screen camera-view issues.

## 2.2.2.8R

_2023-04 · since 2.2.2.3R_

### New
- **Import quality control** when bringing in captures.

### Improved
- More reliable camera visualisation with a persistent connection to the capture server.

## 2.2.2.3R

_2023-04_

### New
- **FBX import and export** with sample content.

### Improved
- Camera settings can be adjusted directly from Mocap Studio; added device-calibration icons.

### Fixed
- Service-status indicator fixes; safer handling of characters with a missing prop prefab.