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In this paper, we propose a novel, robust and high capacity watermarking method for 3D Meshes with arbitrary connectivities in spatial domain based on affine invariants. Given a 3D mesh model, a watermark is embedded as affine-invariant length ratios of one diagonal segment to the residing diagonal intersected by the other one in a coplanar convex quadrilateral. In the extraction process, a watermark is recovered by combining all the watermark pieces embedded in length ratios through majoritydoi:10.1145/2344436.2344440 fatcat:snokjgi25nhivau7scthditdpq