Template:NW4FCurve

Curve

Curves store how animations are performed over time and store the required keys and values for this. They appear in multiple animation subfiles, and their header is of 0x20 bytes size (for BFRES versions earlier than 3.4.0.0, they are of 0x1C bytes size).

Offset	Size	Type	Description
0x00	2	UInt16	Flags. Sets of bits packed as xxxxxxxx xCCCKKFF. FF determines the data type of frames in the Frame array, and KK determines the data type of keys in the Key array. They both map to the same flags. Value Data Type 0 Single 1 Int16 2 Byte / Boolean CCC determines what kind of curve data is stored. Value Description Meaning 0 Cubic Single 4 values of the corresponding data type. 1 Linear Single 2 values of the corresponding data type. 2 Baked Single 1 values of the corresponding data type. 4 Step Integer Unknown. 5 Baked Integer Unknown. 6 Step Boolean Each value is 1 bit. 7 Baked Boolean Unknown.
0x02	2	UInt16	Key count.
0x04	4	UInt32	Target type. Controls what exactly is manipulated by the curve. Differs in each subfile.
0x08	4	Single	Start frame.
0x0C	4	Single	End frame.
0x10	4	Int32 / Single	Data scale.
if BFRES version >= 3.4.0.0
0x14	4	Single	Data delta.
0x18	4	Int32	Frame array offset.
0x1C	4	Int32	Key array offset.
0x20	End of Curve
else
0x14	4	Int32	Frame array offset.
0x18	4	Int32	Key array offset.
0x1C	End of Curve

Frames

The Curve header points to a Frame array which stores values controlling at which frame a Key from the Key array is placed. Thus, the array has as many elements as specified in Key count. The data type of the frames is given in the Curve's Flags.

The end of the array is aligned to 4 bytes.

Keys

The Curve header points to a Key array which stores the values to apply on transformations or parameters which form the animation. Thus, the array has as many elements as specified in Key count. Each element is actually a vector of a different size, the size dependent upon the CCC Curve Type bits in the Curve Flags.

Curve Type	Vector Elements
Cubic Single	4
Linear Single	2
other	1

The type of a vector element is given by the KK Key Type bits in the Curve Flags.