So, it doesn't look very tangent because it crosses the surface.
它看上去并不是十分地相切，因为它穿过了曲面。
We know that the gradient is perpendicular to this vector that's tangent to the level surface What about other vectors tangent to the level surface?
我们知道梯度向量垂直于这个向量，而速度向量是相切于等值面的，其他相切于等值面的向量，又如何呢？
Well, that means the gradient is actually perpendicular to the tangent plane or to the surface at this point.
那意味着，梯度向量在这点上，垂直于切平面或者是等值面。
Now, if I have two lines tangent to the surface, well, then together they determine for me the tangent plane to the surface. Let's try to see how that works.
现在，假设曲面上有两条相交切线，那么这两条切线可以确定一个切平面，我们来看看这个平面是怎么搞出来的。
And, at this point, I have the tangent plane to the level surface OK, so this is tangent plane to the level.
在这点上，我们有一个切于等值面的切面，这就是等值面的切平面。
OK, and that's going to be the normal vector to the surface or to the tangent plane.
这就是切平面的，或者说这个曲面的法向量。
Being perpendicular to the surface means that you are perpendicular to its tangent plane.
垂直于曲面也意味着垂直于它的切平面，垂直于曲面也意味着垂直于它的切平面。
The other way to think about it, the direction in which the value doesn't change is a direction that's tangent to the level surface.
另一种方法是，函数值不变的方向是,是与等值面相切的方向。
In particular, an easy case where you know you can get away without computing anything is, of course, if your vector field is tangent to the surface because then you know that there is no flux.
特别地，有一种简单的情况，是不用计算的，当向量场与曲面相切，没有通量。
The eye vector can be created in global coordinates by subtracting a surface position from the eye position and transforming the resulting vector into tangent space.
视向量能够在全局坐标系中通过视点坐标减去表面坐标来创建，并且要把结果转换到切线空间中。
Create the surface using sweep 2 rails with the tangency option on. To achieve tangent option you will have to build the surface in parts.
创建表面使用扫描第2轨与相切选项。为了实现切线选项，您将必须建设中的表面部分。
Surface electroosmosis method can reduce coal tangent ial resistance but the pole distribution affects the result of reducing resistance.
表面电渗法可有效地减少煤的切向阻力，但电极分布对电渗效果有很大影响。
From this paper, the equations of tangent planes of a quadratic surface are obtained by matrix operations.
本文应用矩阵的运算，给出求二次曲面的切平面方程的一个筒单方法。
The contact Angle is the Angle between the tangent line at the contact point and the horizontal line of the solid surface.
接触角是角之间的切线的联络点和水平线的固体表面。
The object 's surface often possesses some particular geometric continuities such as the continuity of position, of the tangent plane and even of curvature.
实体的表面一般都具有一定的光滑性，比如位置连续、切平面连续甚至曲率连续。
Because the normal map is mapped to the surface, it already lies flat in tangent space.
因为法线贴图会被映射到表面上，所以它已经是在切线空间中了。
During digitizing, the adaptive sampling planning method based on the curvature of surface and the slope of tangent line of measured point is proposed.
在曲面数字化方面，提出基于曲面曲率和被测点切线斜率的自适应采样规划。
Shade the resulting surfaces in tangent continuity is not good enough all over the surface create more section along the pillar to guide more precisely the surface creation.
阴影所产生的表面相切的连续性不够好各地创造更多的表面沿节的支柱，以指导更精确的表面创造。
We deduce the eigenvalues of 2-neighbors subdivision matrix of the scheme, and prove that the subdivision surface is convergent, and has property of tangent plane continuity.
通过对细分矩阵特征值的理论分析，证明了文中方法的细分极限曲面收敛且切平面连续。
The tangent of the main influencing Angle is an important parameter for mining subsidence prediction and surface displacement range demarcation.
主要影响角正切是开采沉陷预计的重要参数，对于地表影响范围的确定具有重要的意义。
The tangent of the main influencing Angle is an important parameter for mining subsidence prediction and surface displacement range demarcation.
主要影响角正切是开采沉陷预计的重要参数，对于地表影响范围的确定具有重要的意义。
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