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法线
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{| class="https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E6%B3%95%E7%BA%BF%E7%A4%BA%E6%84%8F%E5%9B%BE&step_word=&hs=0&pn=30&spn=0&di=7077213605308923905&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=-1&cs=1299384134%2C2533788451&os=2820116252%2C354796586&simid=2573927714%2C2212623342&adpicid=0&lpn=0&ln=886&fr=&fmq=1652431682840_R&fm=rs4&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=%E6%B3%95%E7%BA%BF&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fimage.imufu.cn%2Fforum%2Fmonth_0805%2F20080519_293fa9faea62f1cb2eb1CICGhUta4vKt.png%26refer%3Dhttp%3A%2F%2Fimage.imufu.cn%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1655023821%26t%3Deed755759f197924f5f32a31c9eb32bb&fromurl=ippr_z2C%24qAzdH3FAzdH3Fkkf_z%26e3Bt47u7_z%26e3BvgAzdH3F%3F451%3Detjopi6jw1%26pt1%3Dl8900%26it2ist2ip%3D%25E0%25An%25Ab%25El%25lc%25lC&gsm=1f&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined" style="float:right; margin: -10px 0px 10px 20px; text-align:left"|<center>'''法线'''<br><imgsrc="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimage.imufu.cn%2Fforum%2Fmonth_0805%2F20080519_293fa9faea62f1cb2eb1CICGhUta4vKt.png&refer=http%3A%2F%2Fimage.imufu.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1655023821&t=eed755759f197924f5f32a31c9eb32bb " width="280"></center><small> 圖片來自百度</small> |}
'''法线''' （始终垂直于某平面的虚线)（normal line），是指始终垂直于某平面的直线。在[[几何学]]中，[[法线]]指平面上垂直于曲线在某点的切线的一条线。法线也应用于光学的[[平面镜反射]]上。
曲面法线的法向不具有[[唯一性]]；在相反方向的法线也是曲面法线。定向曲面的法线通常按照[[右手定则]]来确定。
{| class="https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E6%B3%95%E7%BA%BF%E7%A4%BA%E6%84%8F%E5%9B%BE&step_word=&hs=0&pn=5&spn=0&di=7077213605308923905&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=-1&cs=3343720546%2C949817890&os=1058596123%2C2441967294&simid=3343720546%2C949817890&adpicid=0&lpn=0&ln=886&fr=&fmq=1652431682840_R&fm=rs4&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=%E6%B3%95%E7%BA%BF&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fimg-blog.csdnimg.cn%2F20210228213753507.png%3Fx-oss-process%3Dimage%2Fwatermark%2Ctype_ZmFuZ3poZW5naGVpdGk%2Cshadow_10%2Ctext_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppdW1hb2w%3D%2Csize_16%2Ccolor_FFFFFF%2Ct_70%26refer%3Dhttp%3A%2F%2Fimg-blog.csdnimg.cn%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1655024251%26t%3D78fe48b2ac18dc24b1709baf94d4de46&fromurl=ippr_z2C%24qAzdH3FAzdH3Fks52_z%26e3Bvf1g_z%26e3BgjpAzdH3F3t74w5sAzdH3Fw6ptvsjAzdH3F1jpwtsfAzdH3F889d9a9c0&gsm=6&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined" style="float:right; margin: -10px 0px 10px 20px; text-align:left"|<center>'''法线'''<br><imgsrc=" https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg-blog.csdnimg.cn%2F20210228213753507.png%3Fx-oss-process%3Dimage%2Fwatermark%2Ctype_ZmFuZ3poZW5naGVpdGk%2Cshadow_10%2Ctext_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppdW1hb2w%3D%2Csize_16%2Ccolor_FFFFFF%2Ct_70&refer=http%3A%2F%2Fimg-blog.csdnimg.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1655024251&t=78fe48b2ac18dc24b1709baf94d4de46" width="280"></center><small> 圖片來自百度</small> |}
==计算==
对于像三角形这样的多边形来说，多边形两条相互不平行的边的[[叉积]]就是多边形的法线。
三维软件中对于法线的显示与编辑几乎大同小异，如在MAYA中，即为：勾选Display菜单下 Polygons下 Face Normals可以看到，Polygons板块下的Normals菜单是关于法线的，其中最常用的是翻转法线命令，还有Mesh 菜单下Cleanup...命令是可以修正拓扑错误的，法线错误属于拓扑错误中的一种。
'''视频'''
'''3DMAX基础教程：法线贴图'''
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==参考文献==
{{Reflist}}