void VPathRenderingData::RemoveLinkRoll(hkvMat3 const& mPrevRot, hkvMat3& mRot, bool& bDirection) const
{
hkvMat3 mPrevRotInv(mPrevRot);
VVERIFY(mPrevRotInv.invert() == HKV_SUCCESS);
// Calculate the rotation of the current link in the space of the
// previous link
hkvMat3 mThisInPrev = mPrevRotInv.multiply(mRot);
// Check whether we are changing direction (that is, we have a sharp angle
// between two links). In this case, we need to change how we adjust the roll.
hkvVec3 v2(mThisInPrev * hkvVec3(1, 0, 0));
bool bChangingDirection = bDirection ? v2[0] > 0 : v2[0] < 0;
if (bChangingDirection)
bDirection = !bDirection;
// Adjust the roll component
float rgfThisInPrev[3];
mThisInPrev.getAsEulerAngles(rgfThisInPrev[2], rgfThisInPrev[1], rgfThisInPrev[0]);
if (bDirection)
rgfThisInPrev[2] = 180.f;
else
rgfThisInPrev[2] = 0.f;
mRot.setFromEulerAngles(rgfThisInPrev[2], rgfThisInPrev[1], rgfThisInPrev[0]);
// Transform back to global space
mRot = mPrevRot.multiply(mRot);
}
