在2D实拍视频中合成3D动画
发表时间：2005-10-26 11. Foreground and Masking.
11. 前景和遮罩
By now I'll assume you have a fairly convincing CG element composited into your background.
现在我肯定你有相当可信的CG元素合成到背景中了。
Now comes the really boring part, you'll have to take a copy of your background plate, and place it at the top layer. Now draw a mask around any foreground elements that may clip your CG element (in my example this would be the monitor). If your foreground elements are moving or very detailed, then oh dear !, you have no choice but to rotoscope the whole sequence, masking out the foreground objects one by one.
现在到了一个烦人的部分，你需要拷贝一份背景图层，将其放置在最上层。现在围绕着任何会遮挡CG的前景元素画一个遮罩。（在这个例子中是显示器。）如果你的前景元素是移动的或有很多细节，天呀！你必须吃透整个场景，一个一个地为前景画出遮罩。
Now you can place this foreground element back over your scene as in the image below.
现在你可以把前景元素放回图像后面了。
12. Nearly there ! - Shadows.
12. 马上要成功了！阴影。
Congratulations !, you're nearly there. Now you just need to take your 3 shadow elements and take them through the process outlined above to blur, add noise and alter their opacity correctly.
祝贺你！你马上要成功了。现在你只需要把你的3个阴影元素放到合成中并添加噪声、恰当的设置他们的透明度。
The image below shows my finished frame.
下图为我完成的帧。
Notes
It's not perfect, the shadows aren't perfectly aligned, the cup handle doesn't recieve any shadows and I've yet to add motion blur. In a perfect world I would have liked to make a better job of the reflections on the car's body, but this would have pushed render time too high with my rather inefficient mesh. Enjoy!
后记
这不完美，阴影不是完美的吻合。杯子的手柄不能接受任何阴影，我还加入的运动模糊。为了完美，我想要为车身做出更好的反射，但这将加长渲染时间。
更正失误：'cast shadows only'（只投射阴影）的纹理插件在3Dmax5上运行出要错误。 希望没有给你造成麻烦。
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