Template:NW4FCurve

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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 0x24 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 relative flags.
Value Size Type
0 4 Single
1 2 16-bit fixed point value (10 bits integral and 5 bits fractional)
2 1 Byte
  • CCC determines what kind of curve data is stored, resulting in a different number of elements stored per Key. The exact meaning on how to interprete these values is unknown, they are used to set the interpolation method from one key to the next.
Value Description Elements per Key
0 Cubic Single 4 (hermite interpolation)
1 Linear Single 2 (linear interpolation)
2 Baked Single 1
4 Step Integer 1
5 Baked Integer 1
6 Step Boolean 1
7 Baked Boolean 1
0x02 2 UInt16 Key count.
0x04 4 UInt32 Target Offset, an offset in bytes into the corresponding Animation Data structure to animate the field at that relative address.
0x08 4 Single Start frame.
0x0C 4 Single End frame.
0x10 4 Int32 / Single Data scale, multiplier to the raw values to get the final result.
if BFRES version >= 3.4.0.0
0x14 4 Single Data offset, added to the raw values (after multiplication with Data scale) to get the final result.
0x18 4 Single Data delta, unknown purpose.
0x1C 4 Int32 Frame array offset.
0x20 4 Int32 Key array offset.
0x24 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, multiplied by the number of elements stored per key (depended upon the CCC Curve Type bits in the Curve Flags as described above). The type of each element is given by the KK Key Type bits in the Curve Flags.

The end of the array is aligned to 4 bytes.