{
  "id": "body_tracking_reactive",
  "name": "Body Tracking Reactive",
  "description": "A camera-reactive performance look: the 33 MediaPipe body landmarks become glowing dots that leave luminous motion trails as the performer moves, via a feedback loop. Point the 'posein' Select CHOP at the pose-landmarks CHOP from the free torinmb/mediapipe-touchdesigner plugin (33 samples, tx/ty/tz) — webcam only, no Kinect or extra hardware. Run setup_body_tracking first to load the engine and emit that CHOP, or use create_body_reactive for a self-contained synthetic preview.",
  "tags": ["mediapipe", "pose", "body-tracking", "reactive", "feedback", "camera", "performance"],
  "difficulty": "advanced",
  "td_version_min": "2022",
  "nodes": [
    {
      "name": "posein",
      "type": "selectCHOP",
      "comment": "Set 'chop' to the MediaPipe plugin's pose-landmarks CHOP (33 samples, tx/ty/tz)"
    },
    { "name": "geo", "type": "geometryCOMP" },
    {
      "name": "dot",
      "type": "sphereSOP",
      "parameters": { "radx": 0.035, "rady": 0.035, "radz": 0.035 },
      "parent": "geo",
      "comment": "The mark stamped on each landmark"
    },
    {
      "name": "pts",
      "type": "choptoSOP",
      "parent": "geo",
      "comment": "33 landmark samples become 33 points (tx/ty/tz map to position)"
    },
    {
      "name": "copy",
      "type": "copySOP",
      "parent": "geo",
      "render": true,
      "comment": "Stamp the dot on every landmark point"
    },
    {
      "name": "dotmat",
      "type": "constantMAT",
      "parameters": { "colorr": 0.2, "colorg": 1, "colorb": 0.9 }
    },
    { "name": "cam", "type": "cameraCOMP", "parameters": { "tz": 4.6 } },
    {
      "name": "render",
      "type": "renderTOP",
      "parameters": {
        "outputresolution": "custom",
        "resolutionw": 1280,
        "resolutionh": 720,
        "antialias": "3"
      }
    },
    {
      "name": "feedback1",
      "type": "feedbackTOP",
      "comment": "Holds the previous (decayed) frame — the motion trail"
    },
    {
      "name": "comp1",
      "type": "compositeTOP",
      "parameters": { "operand": "add" },
      "comment": "Add the live dots over the fed-back trail"
    },
    {
      "name": "decay",
      "type": "levelTOP",
      "parameters": { "brightness1": 0.92 },
      "comment": "Trail decay / feedback gain — higher = longer trails"
    },
    { "name": "bloom", "type": "blurTOP", "parameters": { "size": 12 } },
    {
      "name": "glow",
      "type": "compositeTOP",
      "parameters": { "operand": "add" },
      "comment": "Add a bloom of the trail for the luminous glow"
    },
    { "name": "out1", "type": "nullTOP", "comment": "Output of the system" }
  ],
  "connections": [
    { "from": "dot", "to": "copy", "to_input": 0 },
    { "from": "pts", "to": "copy", "to_input": 1 },
    { "from": "render", "to": "feedback1" },
    { "from": "render", "to": "comp1", "to_input": 0 },
    { "from": "feedback1", "to": "comp1", "to_input": 1 },
    { "from": "comp1", "to": "decay" },
    { "from": "decay", "to": "bloom" },
    { "from": "decay", "to": "glow", "to_input": 0 },
    { "from": "bloom", "to": "glow", "to_input": 1 },
    { "from": "glow", "to": "out1" }
  ],
  "parameters": [
    {
      "name": "landmarks_chop",
      "node": "pts",
      "param": "chop",
      "value": "posein",
      "label": "Landmarks CHOP"
    },
    { "name": "material", "node": "geo", "param": "material", "value": "dotmat" },
    { "name": "geometry", "node": "render", "param": "geometry", "value": "geo" },
    { "name": "camera", "node": "render", "param": "camera", "value": "cam" },
    {
      "name": "feedback_target",
      "node": "feedback1",
      "param": "top",
      "value": "decay",
      "description": "feedbackTOP samples the decayed composite (decay), forming the trail loop. Value resolves to the created node path."
    }
  ],
  "controls": [
    {
      "name": "TrailLength",
      "type": "float",
      "min": 0,
      "max": 1,
      "default": 0.92,
      "bind_to": ["decay.brightness1"]
    },
    {
      "name": "GlowAmount",
      "type": "float",
      "min": 0,
      "max": 48,
      "default": 12,
      "bind_to": ["bloom.size"]
    }
  ],
  "preview_description": "Cyan glowing dots tracing a person's joints, smearing into luminous trails as they move in front of the webcam — a hands-free reactive performance look."
}