pixiv / chatvrm Goto Github PK

-       const track = new THREE.VectorKeyframeTrack(
-          `${nodeName}.quaternion`,
-          origTrack.times,
-          origTrack.values.map((v, i) =>
-            metaVersion === "0" && i % 2 === 0 ? -v : v
-          )
-       );
+      const newValues: number[] = [];
+      const metaVersionZero = metaVersion === "0";
+      let sign = metaVersionZero ? -1 : 1;
+      let opposite = metaVersionZero ? 1 : 1;
+      let prevQuaternion = new THREE.Quaternion();
+
+      if (origTrack.values.length % 4 !== 0) {
+        throw new Error("Invalid origTrack values length");
+      }
+        
+      for (let i = 0; i < origTrack.values.length; i += 4) {
+          const quaternion = new THREE.Quaternion(
+              origTrack.values[i],
+              origTrack.values[i + 1],
+              origTrack.values[i + 2],
+              origTrack.values[i + 3]
+          );
+          if (prevQuaternion.dot(quaternion) < 0 && metaVersionZero) {
+              sign *= -1;
+              opposite *= -1;
+          }
+          newValues.push(
+              sign * origTrack.values[i],
+              opposite * origTrack.values[i + 1],
+              sign * origTrack.values[i + 2],
+              opposite * origTrack.values[i + 3]
+          );
+          prevQuaternion = quaternion;
+      }
+      const track = origTrack.clone();
+      track.values = new Float32Array(newValues);
+      track.name = `${nodeName}.quaternion`;