Scale keys export with PSA (SCALEKEYS chunk)

CUE4Parse-Conversion/Animations/AnimExporter.cs

@@ -130,7 +130,7 @@ private void DoExportPsa(CAnimSet anim, int seqIdx)
                 framesCount += sequence.NumFrames;
             }
 
-            var requireConfig = false;
+            var requireConfig = false; // TODO
 
             int keysCount = framesCount * numBones;
             keyHdr.DataCount = keysCount;
@@ -174,9 +174,37 @@ private void DoExportPsa(CAnimSet anim, int seqIdx)
             // importer will always read "SCALEKEYS" chunk.
             if (Constants.PSA_VERSION >= 20090127)
             {
-                scaleKeysHdr.DataCount = 0;
-                scaleKeysHdr.DataSize = 16; // sizeof(VScaleAnimKey) = FVector + float
+                keysCount = framesCount * numBones;
+                scaleKeysHdr.DataCount = keysCount;
+                scaleKeysHdr.DataSize = Constants.VScaleAnimKey_SIZE;
                 Ar.SerializeChunkHeader(scaleKeysHdr, "SCALEKEYS");
+                for (i = 0; i < numAnims; i++)
+                {
+                    var sequence = anim.Sequences[i];
+                    for (int frame = 0; frame < sequence.NumFrames; frame++)
+                    {
+                        for (int boneIndex = 0; boneIndex < numBones; boneIndex++)
+                        {
+                            var boneScale = FVector.OneVector;
+
+                            if (frame < sequence.Tracks[boneIndex].KeyScale.Length)
+                                boneScale = sequence.Tracks[boneIndex].KeyScale[frame];
+
+                            var key = new VScaleAnimKey
+                            {
+                                ScaleVector = boneScale,
+                                Time = 1
+                            };
+                            key.Serialize(Ar);
+                            keysCount--;
+
+                            // check for user error
+                            if (sequence.Tracks[boneIndex].KeyScale.Length == 0)
+                                requireConfig = true;
+                        }
+                    }
+                }
+                Trace.Assert(keysCount == 0);
             }
 
             // psa file is done

CUE4Parse-Conversion/Animations/PSA/VScaleAnimKey.cs

@@ -0,0 +1,17 @@
+using CUE4Parse.UE4.Objects.Core.Math;
+using CUE4Parse.UE4.Writers;
+
+namespace CUE4Parse_Conversion.Animations.PSA
+{
+    public class VScaleAnimKey
+    {
+        public FVector ScaleVector;
+        public float Time;
+
+        public void Serialize(FArchiveWriter Ar)
+        {
+            ScaleVector.Serialize(Ar);
+            Ar.Write(Time);
+        }
+    }
+}

CUE4Parse-Conversion/Constants.cs

@@ -16,6 +16,7 @@ public class Constants
     public const int VJointPosPsk_SIZE = 4 * 4 + 3 * 4 + 4 + 3 * 4;
     public const int FNamedBoneBinary_SIZE = 64 + 3 * 4 + VJointPosPsk_SIZE;
     public const int VQuatAnimKey_SIZE = 3 * 4 + 4 * 4 + 4;
+    public const int VScaleAnimKey_SIZE = 3 * 4 + 4;
 
     public const int DXT_BITS_PER_PIXEL = 4;