[After Effects] 生成AIを使ってアニメーションをつくってみる

/* ──────────────────────────────────────
   SAMPLE Text Intro Animation  v5
   1920×1080 / 29.97 fps / 5 秒
────────────────────────────────────── */
(function () {
  app.beginUndoGroup("Create SAMPLE Intro");

  /* 1. コンポジション */
  var comp = app.project.items.addComp("SAMPLE_Intro", 1920, 1080, 1, 5, 29.97);

  /* 2. テキストレイヤー */
  var txt = comp.layers.addText("SAMPLE");
  var doc = txt.property("Source Text").value;
  doc.fontSize = 240; doc.fillColor = [1,1,1];
  doc.justification = ParagraphJustification.CENTER_JUSTIFY;
  txt.property("Source Text").setValue(doc);
  txt.position.setValue([960,540]);

  /* 3. Glow 追加（名称フォールバック） */
  var fx = txt.property("ADBE Effect Parade");
  var gNames = ["ADBE Glow2", "ADBE Glo2", "ADBE Glow"];
  var glow = null;
  for (var i=0;i<gNames.length && !glow;i++){
    try { glow = fx.addProperty(gNames[i]); } catch(e){}
  }

  /* 4. Glow Intensity 取得 */
  var glowInt = null;
  if (glow) {
    var cand = ["Glow Intensity","ADBE Glow Intensity","Glow-003"];
    for (var j=0;j<cand.length && !glowInt;j++){
      glowInt = glow.property(cand[j]);
    }
    if (!glowInt) {
      for (var k=1;k<=glow.numProperties && !glowInt;k++){
        var p = glow.property(k);
        if (p && /Intensity/i.test(p.name)) glowInt = p;
      }
    }
  }

  /* 5. キーフレーム設定 */
  var scale   = txt.property("Scale");
  var opacity = txt.property("Opacity");

  scale.setValueAtTime(0.00,[30,30]);    opacity.setValueAtTime(0.00,  0);
  scale.setValueAtTime(0.20,[115,115]);  opacity.setValueAtTime(0.20,100);
  scale.setValueAtTime(0.30,[100,100]);  opacity.setValueAtTime(0.30,100); // ← 追加

  if (glowInt) {
    glowInt.setValueAtTime(0.00,0);
    glowInt.setValueAtTime(0.20,80);
    glowInt.setValueAtTime(0.30,0);
  }

  /* 6. イージーイーズ設定――プロパティごと判定 */
  var easeIn  = new KeyframeEase(0,75);
  var easeOut = new KeyframeEase(0,75);

  function makeEaseArr(dim,e){ var a=[]; for(var d=0;d<dim;d++) a.push(e); return a; }

  var sclIn  = makeEaseArr(scale.value.length, easeIn);
  var sclOut = makeEaseArr(scale.value.length, easeOut);

  var maxKeys = Math.max(scale.numKeys, opacity.numKeys, glowInt ? glowInt.numKeys : 0);
  for (var n=1; n<=maxKeys; n++){
    if (n <= scale.numKeys)   scale  .setTemporalEaseAtKey(n, sclIn,  sclOut);
    if (n <= opacity.numKeys) opacity.setTemporalEaseAtKey(n,[easeIn],[easeOut]);
    if (glowInt && n <= glowInt.numKeys)
                             glowInt.setTemporalEaseAtKey(n,[easeIn],[easeOut]);
  }

  /* 7. 背景黒平面 */
  var bg = comp.layers.addSolid([0,0,0],"BG",1920,1080,1); bg.moveToEnd();

  app.endUndoGroup();
})();