在2D实拍视频中合成3D动画
发表时间：2005-10-26 2.Create the Animation.
2.创建动画。
I'm not going to talk much about your actual animation. I'll assume you have something simple like a rolling ball or the little car I'm using in my demo. Remember that your camera cannot move in this example (camera matching is supported in MAX, but I'll not touch on that for this demo, we'll be working with a simple locked off camera).
这里不涉及具体动画制作，我肯定你手头上有像球滚动或汽车移动这样的可在这个示例中使用的小动画。一定要保证在动画中摄像机是静止的。（虽然3Dmax支持摄像机匹配，但在这个示例中不涉及这些。我们将处理简单的摄像机被锁死的动画。）
3. Tear your hair out lining up the camera.
So now you have a short animation and a video sequence. The next step is to make the camera in your animation line up with the camera you used for your video shoot.
3.现在准备好了一个小动画和视频序列。下一步是将3D动画中的摄像机与视频中使用的摄像机对齐。
Now is the time all those measurements and notes you took onset will come in handy .. assuming you did actually make all those notes on set. If not then it's a very long slow process of setting the viewing angle and the zoom of the camera and shifting it's orientation until it matches.
现在手头上应该有你在拍摄时的测量数据和笔记。否则设置3D动画中的摄影机的角度、焦距、方向与实拍时一致将会是很慢的过程。
To speed this process up it would help if you'd shot a few frames of a real object in your scene, and then keep this for reference along with the dimensions of the object. Then when you come to MAX you can load a frame of this into your background and create the object using it's exact measurements. Now you can be sure your scale of your 3D objects in relation to the background footage and positioning of the virtual camera will be correct.
为了加速这个过程，在实拍时加几帧参考物体会很有帮助。当进入3Dmax中你可以在如一帧作为背景并以其为参考创建物体。现在已可以保证3D物体的放缩值、移动与实际相符。
I used a video case, took the shot into MAX, created a video box in MAX and then lined them both up perfectly, this way i could be sure where the ground was in my MAX scene, and that the animation would align correctly with the footage.
我把一个录像带盒摄入MAX,再在MAX中创建一个虚拟的方块与其严格对齐，这样我可以保证虚拟的场景与实拍的场景吻合。
As you can see above it can take a lot of work to line the objects up correctly, and you may require a few reference objects to ensure the camera is perfectly matched.
从上图中可以看出对齐物体需要许多工作。你可能需要多个参考物体来使摄像机完美的吻合。
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