palette method

void palette(int skin, Float32List nodeMatrices, Float32List out, [ int offset = 0, ])

The palette of skin skin for nodeMatrices (from evaluate): per joint, the top three rows of jointMatrix · inverseBind (kPaletteFloats floats), into out from offset.

Implementation

void palette(
  int skin,
  Float32List nodeMatrices,
  Float32List out, [
  int offset = 0,
]) {
  final data = model.skins[skin];
  final ibm = data.inverseBindMatrices;
  for (var j = 0; j < data.joints.length; j++) {
    final n = data.joints[j] * 16;
    final b = j * 16;
    final o = offset + j * kPaletteFloats;
    // Row r of (N · B): sum over k of N[k*4 + r] * B[c*4 + k], for column c.
    for (var r = 0; r < 3; r++) {
      for (var c = 0; c < 4; c++) {
        out[o + r * 4 + c] =
            nodeMatrices[n + r] * ibm[b + c * 4] +
            nodeMatrices[n + 4 + r] * ibm[b + c * 4 + 1] +
            nodeMatrices[n + 8 + r] * ibm[b + c * 4 + 2] +
            nodeMatrices[n + 12 + r] * ibm[b + c * 4 + 3];
      }
    }
  }
}