And the way it will work is that you have to choose an orientation of a surface, which just means choosing one of the two possible unit normal vectors.
具体方法是，先给曲面定向，也就是选择两个单位法向量中的一个。
Let's break the name down. The "normal" is a vector perpendicular to a surface, which we can use to calculate lighting.
首先我们从名字上开始分析，所谓“法线”指的是垂直于平面的向量，我们使用这个来计算光照。
In four locations where a sunspot was soon to emerge, acoustic waves returned to the solar surface with anomalous rapidity-more than a dozen seconds faster than normal.
在有黑子将要浮现的四个地方，返回到太阳表面的声波异常迅速- - -比正常情形快了至少十二秒。
You can remember, if it helps you, that if a surface is to your right then the normal vector will go down.
你也可以这样记，如果曲面在你的右边,那么法向量就向下。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
为了找到带法向量的面元，我就取这两个的叉积。
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
There's no way to choose consistently a normal vector for the Mobius strip So, that's what we call a non-orientable surface.
为Mobius带选一个始终如一的的法向量是不可能的,这就是所谓的不可定向的曲面。
One question for forecasters is whether there will be a transition to La Nina conditions, in which sea surface temperatures fall below normal.
气象预测工作者面临着一个问题是，它是否会过渡为以海面温度降到正常水平之下为特征的拉尼娜现象。
Objective To introduce a method for repairing and restoring hand function of the patients suffering from large surface area burn with scarce normal skin for reconstruction.
目的探索全身大面积烧伤后，晚期在无正常皮肤可供利用的情况下，手功能障碍的治疗方法。
Angle of Incidence the Angle between an incident ray and the normal to a reflecting or refracting surface.
入射角度入射光与照射在反射或折射平面上的正常光线之间的角度。
And a new method to estimate the normal vector of the surface in Direct Voltime Rendering in Image Space is introduced.
在象空间中的直接体绘制方法中，本文提出了一种新的估计表面法向量的方法。
Important: Raytrace map and Raytrace material use a surface's normal to decide whether a ray is entering or exiting a surface.
重要的：光线追踪贴图和光线追踪材质使用表面法线来决定一束光线是否进入或脱离表面。
Conclusions:There is a normal contact area between the inner surface of lateral femoral tendon and lateral femur condylar to reduce the contact pressure of the lateral surface of patella.
结论：①在正常情况下股外侧肌腱内面与股骨外侧髁存在着接触，这可能是缓解髌骨外侧关节软骨面压力的正常接触；
According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.
根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。
Using the changing rate of maximum feed-rate as a threshold, the surface of the part is divided into different areas according to the values of normal curvature radius.
以最大工作进给速度的变化比率为阈值，把零件表面的法曲率半径划分为不同的区域；
Also, a solution is offered to solve the problem of generating tool axis vector when the surface normal ts perpendicular to rotary plane.
同时解决了曲面法矢垂直于回转平面时刀轴矢量难以确定的关键问题。
According to the potential and its normal derivative on the surface, the potential and field intensity on the ground can be calculated by a numerical method.
根据电位和法向导数，可用数值方法计算地面的电位和电场强度。
Contains herbal Verbena oil to benefit skin functioning for a normal metabolism, and keeps skin surface smooth and brilliant as well as absorbs easily the nutrition required for skin.
含有植物性成分及马鞭草精油，帮助表皮层进行比较正常的新陈代谢，表皮显得比较光滑细致，而且易于吸收皮肤保养品的营养成分。
Contains herbal Verbena oil to benefit skin functioning for a normal metabolism, and keeps skin surface smooth and brilliant as well as absorbs easily the nutrition required for skin.
含有植物性成分及马鞭草精油，帮助表皮层进行比较正常的新陈代谢，表皮显得比较光滑细致，而且易于吸收皮肤保养品的营养成分。
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