// Writing compressed & decompressing keyframes
private RwCompressedKeyFrameData ReadCompressedKeyFrames(BinaryReader reader)
{
var compressedKeyFrames = new List <RwCompressedKeyFrame>();
for (int i = 0; i < KeyFrames.Capacity; i++)
{
var compressedKeyFrame = new RwCompressedKeyFrame
{
Time = reader.ReadSingle(),
RotationX = reader.ReadUInt16(),
RotationY = reader.ReadUInt16(),
RotationZ = reader.ReadUInt16(),
RotationW = reader.ReadUInt16(),
TranslationX = reader.ReadUInt16(),
TranslationY = reader.ReadUInt16(),
TranslationZ = reader.ReadUInt16(),
PreviousFrameOffset = reader.ReadInt32()
};
compressedKeyFrames.Add(compressedKeyFrame);
}
var customData = new RwCompressedKeyFrameCustomData
{
Offset = reader.ReadVector3(),
Scalar = reader.ReadVector3()
};
return(new RwCompressedKeyFrameData(compressedKeyFrames, customData));
}
// Compress keyframes
private void CompressKeyFrames(out List <RwCompressedKeyFrame> compressedKeyFrames, out RwCompressedKeyFrameCustomData customData)
{
var keyFrameToOffsetMap = new Dictionary <RwKeyFrame, int>();
// Move translations >= 0
customData = new RwCompressedKeyFrameCustomData
{
Offset = new Vector3
(
KeyFrames.Min(x => x.Translation.X),
KeyFrames.Min(x => x.Translation.Y),
KeyFrames.Min(x => x.Translation.Z)
)
};
compressedKeyFrames = new List <RwCompressedKeyFrame>();
var offsetTranslations = new List <Vector3>();
for (var i = 0; i < KeyFrames.Count; i++)
{
var keyFrame = KeyFrames[i];
// add key frame to offset map for mapping the previous keyframe
keyFrameToOffsetMap[keyFrame] = i * COMPRESSED_KEYFRAME_SIZE;
// create the compressed key frame
var compressedKeyFrame = new RwCompressedKeyFrame
{
// time will remain the same
Time = keyFrame.Time,
// compress rotation quaternion
RotationX = CompressFloat(keyFrame.Rotation.X),
RotationY = CompressFloat(keyFrame.Rotation.Y),
RotationZ = CompressFloat(keyFrame.Rotation.Z),
RotationW = CompressFloat(keyFrame.Rotation.W),
};
// set to previous frame offset using the map
if (keyFrame.Previous != null)
{
compressedKeyFrame.PreviousFrameOffset = keyFrameToOffsetMap[keyFrame.Previous];
}
else
{
compressedKeyFrame.PreviousFrameOffset = -1;
}
// add the newly created compressed key frame to the list
// it's not yet fully initialized as the translations still
// have to be processed
compressedKeyFrames.Add(compressedKeyFrame);
// offset the translation by the distance overall closest to zero
var translation = keyFrame.Translation;
translation.X -= customData.Offset.X;
translation.Y -= customData.Offset.Y;
translation.Z -= customData.Offset.Z;
// add the offset translation to a seperate list
offsetTranslations.Add(translation);
}
// calculate the translation scalar by taking the largest value of each
// axis
customData.Scalar = new Vector3(
offsetTranslations.Max(x => x.X),
offsetTranslations.Max(x => x.Y),
offsetTranslations.Max(x => x.Z));
// compress the translation using the offset translation and calculated scalar
for (int i = 0; i < offsetTranslations.Count; i++)
{
compressedKeyFrames[i].TranslationX = CompressFloat(offsetTranslations[i].X / customData.Scalar.X);
compressedKeyFrames[i].TranslationY = CompressFloat(offsetTranslations[i].Y / customData.Scalar.Y);
compressedKeyFrames[i].TranslationZ = CompressFloat(offsetTranslations[i].Z / customData.Scalar.Z);
}
}