Ambient Occlusion Tutorial

这个视频教程令我非常满意，它探索了环境光遮蔽的阴影，SketchUp 导出的图片通过 Photoshop 可以轻松地、快速地添加真实感的阴影，我们不需要使用渲染引擎就可以完，如Max 或者 Vray，在环境光遮蔽背后的想法基本上是一个非常快速的方式，在角落里添加阴影，几何形状符合真实的感觉。你会经常看到我在视频里使用 Photoshop 的加深工具，这个教程演示了得到一个非常酷的效果是多么的容易，只需使用 SketchUp 导出的图片，和一些 Photoshop 的工具。

如果你们看过我的《KERKYTHEA素模渲染》，你会发现你得到一个类似的效果，这个渲染引擎为你做了所有的工作，这个新教程背后的想法，是为了展现 Photoshop 里加深工具的强大，还有它可以怎样在建筑渲染图中使用，如果图片里没有很多复杂的几何图像（在这里是一幅鸟瞰图），这方法可以作为一个选项来避开复杂的渲染引擎，例如 Kerkythea，仍然可以得到一个非常好看的最终结果。

I’m pretty excited about this video. It explores the idea of Ambient Occlusion shading to easily and quickly add realism to Sketchup images via Photoshop. This is done without ever using a rendering engine such as MAX or VRAY. The idea behind Ambient Occlusion is basically a really fast way of adding realism to a rendering by adding shadows in corners where geometry meets. You will often see me adding this affect in a lot of the videos I created using the BURN tool in Photoshop. This video demonstrates how easy it is to get a really cool effect using just images exported from Sketchup, and a few tools from Photoshop.
If any of you have watched my Kerkythea clay model tutorial, you will notice that you get a similar look. The rendering engine is doing all of the work for you. The idea behind this new video is to show the power of the BURN tool in Photoshop, and how it can be applied to architectural illustrations. If there isn’t a lot of complex geometry in the image (in my case an aerial view of my design) than this method serves as an option to bypass using a rendering engine such as Kerkythea altogether and still get a really nice looking final result. Also, if your final illustration is looking a little flat, its an easy way to add a little punch to it.

从SketchUp中 导出隐藏线/Exported Linework from Sketchup

导出开启阴影，没有边线的SketchUp 图片/Exported SU image with shadows turned on, line work turned off

在用了加深工具和高斯模糊之后的最终的图片/Final Image after using the Burn tool and Gaussian Blur filter in Photoshop

一些小建议：

我可能用过了一点阴影模糊，哈哈，导致这的主要想法是为了避免非常锐利的阴影边缘，建筑物投下的阴影通常会有一点点衰减，离建筑物更远的阴影会衰减更多。

你也许会注意到，在一开始，我导出的图片没有线，开启了阴影，有阴影纹理，然后我在 Photoshop 里调整它，所以我仅仅留下了阴影，SketchUp 7 不会让我在隐藏线的模式下只导出阴影，所以这想出了一些方法，如果你有更好的办法来仅导出阴影，请告诉我。

A couple of notes:
I may have overdone it a little with the blurring of the shadows haha. The main idea to take away from this part is to avoid having really sharp shadow edges. The shadows cast by a building will usually have a little falloff, adding more falloff as the shadow moves further away from the building
You will notice that in the beginning, I export an image with no lines, shadows turned on, and in shaded mode. I then take it into Photoshop and tweak it so that I am left with just shadows. Sketchup 7 will not let me export just shadows in hidden line mode. So this is a little work around I came up with. If you have any better ideas on how to export just shadows, feel free to post them.


出处：本文译自visualizingarchitecture.com/，转载请注明出处。