目的 为保护3维模型数据的版权，提出一种在3维视图下和线框视图下都可察觉的3维网格可见水印，并针对三角形网格建立了相应的可见水印算法。方法 该算法首先将待嵌入区域投影到2维平面上，再将矢量形式的水印信息嵌入其中，最后将该区域投影到原模型上。算法的核心过程是将三角形划分成在水印信息内和在水印信息外的两部分。文中借鉴了Sutherland-Hodgeman多边形裁剪算法，将其应用于水印嵌入的过程。结果 为验证算法的可行性，使用3个3维模型数据进行了实验，实验结果表明该算法较好地保持了原模型的外观，且嵌入的水印信息在两种视图下清晰可见，嵌入水印后的数据增加量约为10%。结论 本文算法可有效地嵌入水印信息，达到保护3维模型数据版权的目的。

Objective To protect the copyright of 3D model data, a scheme of visible watermark for 3D mesh models that is perceptible in the 3D view and the wireframe view is proposed. A new visible watermarking algorithm for 3D triangle meshes is established as well. Method First, the region to embed is projected onto the 2D plane. Then, the watermark in vector format is embedded into the region. Finally, the region is projected onto the original meshes. The core process of this approach is to separate the triangles into two parts. One part is in the watermark, and the other part is outside the watermark. The Sutherland-Hodgeman algorithm for clipping polygons is altered and used in the embedding. Result To verify the effectiveness of the proposed algorithm, experiments are conducted with 3D model data. The algorithm keeps the visual characteristics of the original model well, and the watermark is plainly visible in both views. The increment of the size of the embedded data is about 10 percent. Conclusion The proposed approach is an effective way to embed watermark into triangle meshes and can be used in the copyright protection of 3D mesh models.