soya.forward = soya.Vector(self, 0,0,-1)

but how can I translate that to root Coord?

I think you can do :

        forward = soya.Vector(self, 0,0,-1)
        forward.convert_to(self.get_root())

I already tried this but convert_to only converts soya.Point not vectors, it returns None when so..

Point.convert_to(parent)\n\nConverts a Point to the coordinates system PARENT 
in place. The x, y and z\ncoordinates are modified, and the Point\'s parent is 
set to PARENT




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