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6c78aa4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | // engine/anim/root-motion.js - written by Muse Glimmer (Phase 32, part A, 27 Sep 2026; raw output in game/muse-authored/phase32/raw/),
// reviewed by Grok Bot (coach) with game/muse-authored/phase32/harness/. Coach fixes are marked [coach fix P32-n], see FIXES-P32.md.
(function () {
function dot(a, b) {
return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}
function sub(a, b) {
return [a[0] - b[0], a[1] - b[1], a[2] - b[2]];
}
function add(a, b) {
return [a[0] + b[0], a[1] + b[1], a[2] + b[2]];
}
function scale(a, s) {
return [a[0] * s, a[1] * s, a[2] * s];
}
function len(v) {
return Math.sqrt(dot(v, v));
}
function hVec(v, up) {
var d = dot(v, up);
return [v[0] - d * up[0], v[1] - d * up[1], v[2] - d * up[2]];
}
function measure(clip, node, up) {
var tracks = clip.tracks || [];
var tr = null;
for (var i = 0; i < tracks.length; i++) {
var t = tracks[i];
if (t.node === node && t.path === 'translation') {
tr = t;
break;
}
}
if (!tr) return null;
var times = tr.times;
var values = tr.values;
var n = times.length;
if (n === 0) return null;
var first = [values[0], values[1], values[2]];
var lastIdx = (n - 1) * 3;
var last = [values[lastIdx], values[lastIdx + 1], values[lastIdx + 2]];
var net = sub(last, first);
var hnet = hVec(net, up);
var horiz = len(hnet);
var vert = Math.abs(dot(net, up));
var maxHoriz = 0;
for (var i = 0; i < n; i++) {
var idx = i * 3;
var key = [values[idx], values[idx + 1], values[idx + 2]];
var diff = sub(key, first);
var hd = hVec(diff, up);
var l = len(hd);
if (l > maxHoriz) maxHoriz = l;
}
var duration = clip.duration || 0;
var speed = duration > 0 ? horiz / duration : 0;
return { keys: n, first: first, last: last, net: net, horiz: horiz, vert: vert, maxHoriz: maxHoriz, speed: speed };
}
function strip(clip, node, up, opts) {
opts = opts || {};
var mode = opts.mode === 'lock' ? 'lock' : 'drift';
var tracks = clip.tracks || [];
var found = false;
var newTracks = [];
var removed = [0, 0, 0];
for (var i = 0; i < tracks.length; i++) {
var t = tracks[i];
if (t.node === node && t.path === 'translation' && t.times.length > 0) { // [coach fix P32-3] an empty track made NaN keys; now treated as no track
found = true;
var times = t.times;
var values = t.values;
var n = times.length;
var first = [values[0], values[1], values[2]];
var lastIdx = (n - 1) * 3;
var last = [values[lastIdx], values[lastIdx + 1], values[lastIdx + 2]];
var net = sub(last, first);
var hnet = hVec(net, up);
removed = hnet;
var newValues = new Float32Array(values.length);
newValues.set(values);
var t0 = times[0];
var tLast = times[n - 1];
var denom = tLast - t0;
for (var k = 0; k < n; k++) {
var idx = k * 3;
var key = [values[idx], values[idx + 1], values[idx + 2]];
var newKey;
if (mode === 'drift') {
var u = denom !== 0 ? (times[k] - t0) / denom : 0;
var subVec = scale(hnet, u);
newKey = sub(key, subVec);
} else {
var diff = sub(key, first);
var hdiff = hVec(diff, up);
newKey = sub(key, hdiff);
}
newValues[idx] = newKey[0];
newValues[idx + 1] = newKey[1];
newValues[idx + 2] = newKey[2];
}
var newTrack = Object.assign({}, t, { times: times, values: newValues }); // [coach fix P32-3] keep any other track fields (was a fixed field list)
newTracks.push(newTrack);
} else {
newTracks.push(t);
}
}
if (!found) {
return { clip: clip, removed: [0, 0, 0], mode: mode };
}
var newClip = { name: clip.name, duration: clip.duration, tracks: newTracks };
return { clip: newClip, removed: removed, mode: mode };
}
function pickRoot(skeleton, clips, hipsNode) {
var nodes = (skeleton && skeleton.nodes) || [];
var candidates = new Set();
for (var i = 0; i < clips.length; i++) {
var trs = clips[i].tracks || [];
for (var j = 0; j < trs.length; j++) {
var t = trs[j];
if (t.path === 'translation') {
candidates.add(t.node);
}
}
}
function moves(nodeIdx) {
for (var i = 0; i < clips.length; i++) {
var trs = clips[i].tracks || [];
for (var j = 0; j < trs.length; j++) {
var t = trs[j];
if (t.node === nodeIdx && t.path === 'translation') {
var times = t.times;
var values = t.values;
var n = times.length;
if (n < 2) continue;
var first = [values[0], values[1], values[2]];
var maxd = 0;
for (var k = 1; k < n; k++) {
var idx = k * 3;
var key = [values[idx], values[idx + 1], values[idx + 2]];
var d = Math.sqrt(
(key[0] - first[0]) * (key[0] - first[0]) + (key[1] - first[1]) * (key[1] - first[1]) + (key[2] - first[2]) * (key[2] - first[2]),
);
if (d > maxd) maxd = d;
}
if (maxd > 1e-6) return true;
}
}
}
return false;
}
if (hipsNode >= 0 && hipsNode < nodes.length) {
var chain = [];
var cur = hipsNode;
while (cur >= 0 && cur < nodes.length && chain.length <= nodes.length) { // [coach fix P32-3] stop on bad / cyclic parent indices (was an endless loop or a TypeError)
chain.push(cur);
var p = nodes[cur].parent;
if (p == null || p < 0) break;
cur = p;
}
for (var i = 0; i < chain.length; i++) {
var nIdx = chain[i];
if (candidates.has(nIdx) && moves(nIdx)) {
return nIdx;
}
}
}
var bestIdx = -1;
var bestDepth = Infinity;
function depth(idx) {
var d = 0;
var cur = idx;
while (cur >= 0 && cur < nodes.length && d <= nodes.length) { // [coach fix P32-3] cycle guard
var p = nodes[cur].parent;
if (p == null || p < 0) break;
d++;
cur = p;
}
return d;
}
candidates.forEach(function (nIdx) {
if (!moves(nIdx)) return;
var d = depth(nIdx);
if (d < bestDepth || (d === bestDepth && nIdx < bestIdx)) {
bestDepth = d;
bestIdx = nIdx;
}
});
return bestIdx;
}
var MuseRootMotion = { measure: measure, strip: strip, pickRoot: pickRoot };
if (typeof window !== 'undefined') window.MuseRootMotion = MuseRootMotion;
if (typeof module !== 'undefined') module.exports = MuseRootMotion;
})();
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