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Texture mapping subdivision surfaces with hard constraints

机译:具有硬约束的纹理贴图细分曲面

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We propose a texture mapping technique that allows user to directly manipulate texture coordinates of subdivision surfaces through adding feature correspondences. After features, or constraints, are specified by user on the subdivision surface, the constraints are projected back to the control mesh and a polygon matching/embedding algorithm is performed to generate polygon regions that embed texture coordinates of control mesh into different regions. After this step, some Steiner points are added to the control mesh. The generated texture coordinates exactly satisfy the input constraints but with high distortions. Then a constrained smoothing algorithm is performed to minimize distortions of the subdivision surface via updating texture coordinates of the control mesh. Finally, an Iterative Closest Point (ICP)-based deformation algorithm is performed to remove subdivision errors caused by the added Steiner points.
机译:我们提出了一种纹理映射技术,该技术允许用户通过添加特征对应关系直接操纵细分曲面的纹理坐标。在用户在细分表面上指定了特征或约束之后,将约束投影回控制网格,并执行多边形匹配/嵌入算法以生成将控制网格的纹理坐标嵌入不同区域的多边形区域。完成此步骤后,会将一些Steiner点添加到控制网格中。生成的纹理坐标恰好满足输入约束,但失真很高。然后执行约束平滑算法,以通过更新控制网格的纹理坐标来最小化细分表面的变形。最后,执行基于迭代最近点(ICP)的变形算法,以消除由添加的Steiner点引起的细分误差。

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