Why TouchDesigner Alternative Works Here
Contour-based blob detection
Extracts contours and tracks each blob's centroid frame to frame, with threshold, blur, and size filtering exposed as sliders — the same underlying workflow as TouchDesigner’s own Blob Track TOP.
Live OSC / WebSocket telemetry
The TouchDesigner / OSC panel broadcasts per-blob ID, center X/Y, bounding box, and velocity as live JSON over WebSockets, with a ready-to-paste Python receiver DAT script for TouchDesigner.
No patch to build
Threshold, blur, minimum/maximum blob area, and background-subtraction sensitivity are all exposed as sliders — tune the detection without wiring a single TOP/CHOP network.
Generative visuals included
Constellation links, velocity vectors, halo auras, and a dozen other overlay styles render directly on the tracked blobs — useful for previewing a look before rebuilding it natively in TD.
Runs anywhere a browser does
No GPU driver requirements, no project file, no install — useful for a quick prototype on a laptop that doesn’t have TouchDesigner installed at all.
Free, no account required
Every tracking mode, visual style, and export option is available with no signup, watermark, or usage limit.
Frequently Asked Questions
How do I get tracking data into TouchDesigner from this?
Open the TouchDesigner / OSC panel, enable WebSocket streaming, and paste the provided Python DAT script into a Text DAT in TouchDesigner — it parses the incoming JSON into usable CHOP channels.
Is this actually TouchDesigner, or a replacement for it?
Neither — it’s a standalone browser tool that mirrors the Blob Track TOP’s workflow (contour detection, centroid tracking) and can feed live data into an existing TouchDesigner patch over OSC/WebSockets. It doesn’t replace TD’s broader node graph.
What data does the OSC/WebSocket stream include?
Per-blob ID, normalized and pixel-space center coordinates, bounding box width/height, and frame-to-frame velocity vectors, sent as JSON.
Does it work with Max/MSP or Ableton instead of TouchDesigner?
Yes — the stream is plain JSON over a standard WebSocket, so anything that can open a WebSocket client (Max’s [node.script], Ableton via Max for Live, etc.) can consume it, not just TouchDesigner.
Is Blob Track a TOP or a CHOP in TouchDesigner?
Blob tracking uses the Blob Track TOP, since it operates on images. The tracked blob data is read from it as data, typically with an Info DAT or Info CHOP.
What is the shortest blob tracking workflow in TouchDesigner?
A minimal network is Video Device In TOP (or Movie File In) → Threshold TOP → Blob Track TOP, with an Info DAT or Info CHOP to read the blob positions. Add a Blur TOP before the threshold if the mask is noisy.
Is there a free way to do blob tracking like TouchDesigner?
TouchDesigner offers a free Non-Commercial license. Vis Exo is a separate free alternative that runs in the browser with no install, and can stream its blob data into TouchDesigner.
