The algorithm firstly determines reference curves that can express vertical outline change of the model, and then select slicing thickness according to tangent of poi.

首先求出能够表示模型垂直方向轮廓变化情况的参考曲线，然后在切片时根据参考曲线上各点处切线确定在该处的切片厚度。

youdao

Next, in the interior of the patches, surface fitting points and cross boundary derivatives are estimated from the reference curves by constructing virtual iso-parametric curves.

其次，在曲面片内部，曲面拟合点和边界方向导数可以从参考曲线中通过构建虚拟等参线的方法得到。

youdao

To model the ground with the correct heights we used the level curves drawn in the reference drawing.

为了给地面模型设置合适的高度，我们使用从参考图提取的等位曲线。

youdao

Mr. Houghton has described them as torn pieces of paper, perhaps in reference to Mr. Gehry's reputed method of crumpling scraps to model his architecture's curves.

WSJ: Frank Gehry | Pershing Square Signature Center | By Julie V. Iovine

To see what was going on, Dr Hansen superimposed the actual curves for each decade from the fifties to the noughties on a normal distribution, which acted as a reference curve.

ECONOMIST: Climate change