A Note on the G1 Conditions Between Bèzier Surface Patches

A G¹ necessary and sufficient condition between Bèzier surface patches was given by author．A set of parameters are contained in the condition，but no restraint conditions are explained there．In fact，these parameters are not fully free，they must satisfy certain restraint conditions．In this short paper，some restraint conditions are conducted and a relation between the shape functions and the shape of the adjacent patches along the shared boundary curve is presented．