Watermarking a 3D mode is one of the hot topics in digital watermark. The most difficulties of the watermarking model 3D models are mainly on maintaining robustness

embedding readable watermark and blind detecting watermarks. In order to enhance the robustness

this paper proposed a local geometric space based watermarking algorithm for the triangular meshes of 3D models. It is defined as a local geometric space by selected vertex and close neighboring vertices of the triangular meshes in the 3D model

Then the watermarks are embedded through adjusting the position of the selected vertex within their related spaces. The parameter of the central angle is rectified for embedding an index of a series of watermark; The distance between vertex and the central point is rectified for embedding high bit of binary numerical value. The experimental results show that the algorithm guarantees the high performance of the watermark robustness such as translation

rotation

scaling

vertex permutation

model cropping and model simplification with this approach

embedded watermarks can be detected without the original model. And the results also present an evident superiority in non sentience of embedding readable watermark.