private FBXVector GetEulerXYZ(CSGGroup group, float time)
{
CSGMatrix transformLH = new CSGMatrix();
group.GetTransform(group.Parent, time, ref transformLH);
var transformRH = ConvertTransformToRightHanded_ThisLittleBitTookFourDaysToFigureOut(transformLH);
FBXMatrix matrix = new FBXMatrix(
transformRH.m11,
transformRH.m12,
transformRH.m13,
transformRH.m14,
transformRH.m21,
transformRH.m22,
transformRH.m23,
transformRH.m24,
transformRH.m31,
transformRH.m32,
transformRH.m33,
transformRH.m34,
transformRH.m41,
transformRH.m42,
transformRH.m43,
transformRH.m44);
FBXQuaternion fbxQuaternionRH = matrix.GetQuaternion();
var eulerXYZRH = fbxQuaternionRH.DecomposeSphericalXYZ();
return(eulerXYZRH);
}
private static CSGMatrix ConvertTransformToRightHanded_ThisLittleBitTookFourDaysToFigureOut(CSGMatrix transform)
{
// mirror each base vector's z component
transform.m13 *= -1;
transform.m23 *= -1;
transform.m33 *= -1;
transform.m43 *= -1;
// and now invert the Z base vector to keep the matrix decomposable
// will come out just fine when the meshes are locally mirrored as well
transform.m31 *= -1;
transform.m32 *= -1;
transform.m33 *= -1; // NOTE: this is inverted twice. Not sure why, but if there is a bug, this is probably it.
transform.m34 *= -1;
return(transform);
}
