import c4d
from c4d import gui, utils
#Welcome to the world of Python

globrot = True
upVector = c4d.Vector(1,1,0)
rotVector = c4d.Vector(utils.Rad(45), 0, 0)

def main():
    rotmgp = utils.HPBToMatrix(rotVector)
    rotmgm = utils.HPBToMatrix(rotVector - c4d.Vector(utils.Rad(180), 0, 0))
    
    if op:
        if globrot:
            for id, pvec in enumerate(op.GetAllPoints()):
                tng = op.GetTangent(id)
                op.SetTangent(id,
                             rotmgp.MulV(tng["vl"]),
                             rotmgp.MulV(tng["vr"]))
        else:
            for id, pvec in enumerate(op.GetAllPoints()):
                dtng = op.GetTangent(id)
                tng = (dtng["vr"] - dtng["vl"]).GetNormalized()
                nrm = (tng % upVector).GetNormalized()
                brnm = (nrm % tng).GetNormalized()
                vmg = c4d.Matrix(pvec, nrm, brnm, tng)
                op.SetTangent(id,
                             (vmg * rotmgm).MulV(c4d.Vector(dtng["vl"].GetLength(),0,0)),
                             (vmg * rotmgp).MulV(c4d.Vector(dtng["vr"].GetLength(),0,0)))
                                          
        op.Message(c4d.MSG_POINTS_CHANGED)
        c4d.EventAdd()
    
if __name__=='__main__':
    main()