Brushed Stainless Steel (Tutorial)

每隔一段时间，我就会需要渲染一个拉丝不锈钢的柱子的图片，就像上图所示一样。以我来看，在任何渲染软件里调整“反光”设置来获得拉丝效果会非常增加渲染时间。最重要的是，它可以采取多种测试渲染来达到我希望的风格。所以我创建了一个类似的渲染，这个过程很简单，但功能强大。基本流程涉及到渲染材质，比如一个简单的镜面反射。和调整“反光”设置不同，渲染成镜面反射的效果几乎不会增加渲染时间。移到 Photoshop 里后，我用了一个动感模糊和高斯模糊来使它呈现出柔软的、拉丝不锈钢效果。

大多数渲染软件可以轻松创建反射表面。我可以用一些简单的步骤来向使用 Keykythea 的人展示如何完成。

Every so often, there comes a time when I need to illustrate a brushed stainless steel finish like the column in the above image. In my experience, adjusting the “shininess” settings in any rendering program to get that brushed look dramatically increases the rendering time. On top of that, it can take multiple test renderings to get the result I am hoping for. So… I created a work around. The process is simple, but powerful. The basic workflow involves rendering the material as a simple mirror reflection. Rendering as a mirror reflection adds almost no time to the total render time unlike adjusting the “shininess” settings. Once in Photoshop, I apply a motion blur and Gaussian blur to give it that soft, brushed stainless steel look.
Most rendering software can create reflective surfaces easily. For those of you who use Kerkythea, I have added some quick steps to show you how it’s done.


1）在 Kerkythea里，选择你想要有拉丝模糊效果的材质，在左侧面板里，一颗星星会高显在被选择的材质里，右键单击材质，选择“编辑材质”。

1) In Kerkythea, select the material you want to have the brushed finish. In the left panel, a star will highlight the material selected. Right-click on that material and choose “Edit Material”.



  
2）在“材质编辑器”对话框里，右键单击“反射”，选择“添加颜色”图标。

2) Once in the “Material Editor” dialogue box, right-click on the work “Reflection” and choose the “Add Color” icon.



  
3）在“选择颜色”对话框中，选择一个白色，然后选择“接受”。
  
3) In the “Select Color” dialogue box, choose a white color. Then choose “Accept”.


  

4）随着材质的设置，渲染出几何图形，并将其在 Photoshop 里打开。在Photoshop里使用“多边形套索工具“来选择需要被模糊软化的部分，然后在选区里右键单击，将选区复制为图层。

PHOTOSHOP POST PROCESSING:
4) With the materials setup, render the geometry and open the rendering in Photoshop. Once in Photoshop, choose the “Polygonal Lasso Tool” and select the mirror reflection items to be softened. Once selected, right-click inside of the selection and choose “Layer via Copy”.




5）现在我想选择刚才复制的新图层，这样当我模糊图层时，他会保持清新的边缘。要完成这一步，选择“魔术棒工具”，然后选择周边的区域的新图层，接下来，选择“选择>反选”，来翻转选区，使金属柱子在新的图层中。

5) I now want to reselect this new layer so that when I blur the layer, it will maintain crisp edges. To do this, choose the “Magic Wand Tool”, and select the area around the new layer. Next, choose “Select>Inverse” to flip the selection to the metal material in the new layer.




6）在顶部，选择“滤镜>模糊>动感模糊”。
  
6) At the top, choose “Filter>Blur>Motion Blur”.



  
7）“动感模糊”（Motion Blur）对话框打开后，出现一个“角度”的对话框。因为柱子是一个垂直元素，所以我想要模糊也是垂直的感觉。因此，我把角度设置为 90 度，不同图片的距离会不同。200 像素对于这张图来说最合适了。

7) With the “Motion Blur” dialogue box open, go to the box marked “Angle”. Since the column is a vertical element, I want the blur to move vertically as well. Therefore, I am setting the angle to 90 degrees. The distance will vary from illustration to illustration. It seemed like 200 pixels worked best for this image.



  
8）垂直条纹仍然显得太尖锐。选中柱子，添加一个高斯模糊，进入“滤镜>模糊>高斯模糊”，打开对话框。

8) The vertical streaks are still too sharp. With the column still selected, I am going to give it a Gaussian Blur. Go to “Filter>Blur>Gaussian Blur” to open the dialogue box.




9）在“高斯模糊”对话框中，调整半径以软化金属的反射，这个步骤很容易操之过度，因此请确保谨记关于反射亮部和暗部的定义。
  
9) In “Gaussian Blur” dialogue box, adjust the radius to soften the metal reflection. It’s easy to overdo it in this step so make sure you don’t lose the definition of the light and dark areas of the reflection.



  
10）最后一步，有时需要复制拉丝金属图层，获得更加强烈的边缘效果，从而弥补模糊可能会导致的边缘有些透明的缺陷。

我一直用这个方法，而且效果都不错。尽管它开始看起来复杂，但事实上，流程非常简单。我才开始深入研究每一步，期望能回答大家提出的各种问题。

10) As a final step, sometimes it is necessary to duplicate the brushed metal layer to get more definition around the edges since blurring may cause the edges to be somewhat transparent.
I use this technique all the time and the results almost always come out great. Although it may seem complicated at first, in reality, it is a very simple workflow. I just went into great depth in each step in hopes of answering most questions that may come up.


上图：使用Photoshop的软化技术之前的柱子

Above: The column before the Photoshop softening technique.



上图：使用Photoshop的软化技术之后的柱子

Above: The column after the Photoshop softening technique.


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