This thesis presents the notion of geometric continuity between adjacent parametric surfaces. It describes the necessary and sufficient conditions for two adjacent surfaces joining $G^n$-continuously and geometric interpretation of $G^1$-continuity. Triangular and tensor product polynomial Bézier patches are introduced and their properties are given. An important result of this work is a derivation of necessary and sufficient conditions for $G^n$-continuity between two adjacent tensor
product Bézier surfaces. Those conditions, expressed with control points, are then used in examples of $G^1$ and $G^2$-continuous Bézier surfaces. The comparison with $C^1$ and $C^2$-continuity conditions is given too. The obtained results are applied to derive the compatibility conditions for $N$ surfaces joining $G^1$-continuously at the common vertex.
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