[page:Color_Hex_or_String r] - (optional) If arguments [page:Float g] and [page:Float b] are defined, the red component of the color.
If they are not defined, it can be a [link:https://en.wikipedia.org/wiki/Web_colors#Hex_triplet hexadecimal triplet] (recommended), a CSS-style string, or another Color instance.<br/>
[page:Float g] - (optional) If it is defined, the green component of the color.<br/>
[page:Float b] - (optional) If it is defined, the blue component of the color.<br/><br/>
Note that standard method of specifying color in three.js is with a [link:https://en.wikipedia.org/wiki/Web_colors#Hex_triplet hexadecimal triplet], and that method is used
throughout the rest of the documentation.<br/><br/>
When all arguments are defined then [page:Color_Hex_or_String r] is the red component, [page:Float g] is the green component and [page:Float b] is the blue component of the color.<br/>
When only [page:Color_Hex_or_String r] is defined:<br/>
当所有参数被定义时，r是红色分量，g是绿色分量，b是蓝色分量。<br/>
当只有 [page:Color_Hex_or_String r] 被定义时：<br/>
<ul>
<li>It can be a [link:https://en.wikipedia.org/wiki/Web_colors#Hex_triplet hexadecimal triplet] representing the color (recommended).</li>
will result in the [page:.elements elements] array containing:
元素数组[page:.elements elements]将存储为:
<code>
m.elements = [ 11, 21, 31,
12, 22, 32,
13, 23, 33 ];
</code>
and internally all calculations are performed using column-major ordering. However, as the actual ordering
makes no difference mathematically and most people are used to thinking about matrices in row-major order,
the three.js documentation shows matrices in row-major order. Just bear in mind that if you are reading the source
code, you'll have to take the [link:https://en.wikipedia.org/wiki/Transpose transpose] of any matrices outlined here to make sense of the calculations.
Sets this matrix as the upper left 3x3 of the [link:https://en.wikipedia.org/wiki/Normal_matrix normal matrix]
of the passed [page:Matrix4 matrix4]. The normal matrix is the [link:https://en.wikipedia.org/wiki/Invertible_matrix inverse] [link:https://en.wikipedia.org/wiki/Transpose transpose]
of the matrix [page:Matrix4 m].
将这个矩阵设置为给定矩阵的正规矩阵[link:https://en.wikipedia.org/wiki/Normal_matrix normal matrix]（左上角的3x3）。
A two dimensional surface that extends infinitely in 3d space, represented in [link:http://mathworld.wolfram.com/HessianNormalForm.html Hessian normal form]
