private Key [] ComputeKeys(UnityEngine.Quaternion restRotation, FbxNode node)
{
// Get the source pivot pre-rotation if any, so we can
// remove it from the animation we get from Unity.
var fbxPreRotationEuler = node.GetRotationActive()
? node.GetPreRotation(FbxNode.EPivotSet.eSourcePivot)
: new FbxVector4();
// Get the inverse of the prerotation
var fbxPreRotationInverse = ModelExporter.EulerToQuaternionXYZ(fbxPreRotationEuler);
fbxPreRotationInverse.Inverse();
// Find when we have keys set.
var keyTimes = ModelExporter.GetSampleTimes(GetCurves(), SampleRate);
// Convert to the Key type.
var keys = new Key[keyTimes.Count];
int i = 0;
foreach (var seconds in keyTimes)
{
var fbxFinalAnimation = GetConvertedQuaternionRotation(seconds, restRotation);
// Cancel out the pre-rotation. Order matters. FBX reads left-to-right.
// When we run animation we will apply:
// pre-rotation
// then pre-rotation inverse
// then animation.
var fbxFinalQuat = fbxPreRotationInverse * fbxFinalAnimation;
var finalUnityQuat = new Quaternion((float)fbxFinalQuat.X, (float)fbxFinalQuat.Y, (float)fbxFinalQuat.Z, (float)fbxFinalQuat.W);
// Store the key so we can sort them later.
Key key = new Key();
key.time = FbxTime.FromSecondDouble(seconds);
key.euler = ModelExporter.ConvertToFbxVector4(finalUnityQuat.eulerAngles);
keys[i++] = key;
}
// Sort the keys by time
System.Array.Sort(keys, (Key a, Key b) => a.time.CompareTo(b.time));
return(keys);
}