Variable FK 2

variablefk_2.cpp

// ...
const float t = float(i) / float(sampleCount - 1);

for (auto j = 0; j < controlCount; ++j)
{
    const float& param = controlParams[j];
    const float& falloff = controlFalloffs[j];
    const MVector& scale = controlScales[j];

    float weight = 1.0f - std::abs(t - param) / falloff;
    weight = std::max(std::min(weight, 1.0f), 0.0f);
    weight = weight * weight * weight * (weight * (weight * 6 - 15) + 10);

    if (weight <= 0.0f) continue;

    // weighted rotation matrix
    MMatrix rotation = slerp(MQuaternion::identity,
                             MEulerRotation(controlRotations[j]).asQuaternion(),
                             weight).asMatrix();

    // weighted translation matrix
    MMatrix txform;
    const MVector translation(controlTranslations[j] * weight);
    txform[3][0] = translation.x;
    txform[3][1] = translation.y;
    txform[3][2] = translation.z;

    // weighted scale matrix
    MMatrix sclxform;
    sclxform[1][1] = 1.0 + (scale.y - 1.0) * weight;
    sclxform[2][2] = 1.0 + (scale.z - 1.0) * weight;

    // compose the full transformation
    xform = rotation * xform;
    sampleXform = sclxform * rotation * sampleXform * txform;

    controlsHandle.next();
}

parentXform = xform;
sampleFrames.append(sampleXform);
// ...