Variable FK 4

variablefk_4.cpp

// ...
const int prev_sample = int(std::floor(controlParams[j] * (sampleCount - 1)));
const int next_sample = int(std::ceil(controlParams[j] * (sampleCount - 1)));
const float alpha = controlParams[j] - sampleParams[prev_sample];

const MVector tangent = curveFn.tangent(param);
const MVector up1(sampleFrames[prev_sample][1][0],
                  sampleFrames[prev_sample][1][1],
                  sampleFrames[prev_sample][1][2]);
const MVector up2(sampleFrames[next_sample][1][0],
                  sampleFrames[next_sample][1][1],
                  sampleFrames[next_sample][1][2]);
MVector normal = lerp(up1, up2, alpha);
const MVector binormal = tangent ^ normal;
normal = binormal ^ tangent;

MMatrix xform;
xform[0][0] = tangent.x;
xform[0][1] = tangent.y;
xform[0][2] = tangent.z;
xform[1][0] = normal.x;
xform[1][1] = normal.y;
xform[1][2] = normal.z;
xform[2][0] = binormal.x;
xform[2][1] = binormal.y;
xform[2][2] = binormal.z;
// ...