这是一篇作旧金属的教程，由于比较简单而且图片比较丰富，这里就不作翻译了，相信大家都能看的懂。
效果图：
01这是宇宙空间站中的一个场景，整个场景都是使用Nurbs建模。
02贴图
03按下图方式创建一“2D placement node”模式贴图。我们使用如上材质设置color和bump。
04得到如下效果：
05设置材质属性
06Next I map the "Specular Color". We make a duplicate of the file texture "With Connections to Network". This way I only need one texture placement node. Then I connect the duplicate with the Specular Color of the shader.
07Now the highlight looks a little more interesting.
Next I will try some variations on the Specular color by connecting a Ramp to the "Color Remap" of the "Specular Color" file.
08In the file of the "Specular Color" under Effects click the "Insert" button next to "Color Remap".
09This is my final network for the tube shader, all that's left is editing the "Ramp" to get the disired look.
With the help of the IPR it's easy to check out different settings. Now open the "Remap Ramp" and experiment. Below are some Testrenders with their appropriate "Ramps".
10通过调整ramp以后所得到的不同效果
11继续调整ramp
OK，到这里就结束了，方法很简单但是效果很好。
