设置摄像头参数
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预备知识
介绍
当你把一个轨道摄像头添加到场景里后，你可以利用以下积木设置它的距离、角度（俯视角度，仰视角度），同时它也支持动画效果。
参数
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距离: 摄像头与目标之间的距离。
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俯视角度: 摄像头俯视角度的度数。
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侧视角度: 摄像头侧视角度的度数。
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目标 X/Y/Z：摄像头目标点（摄像头正在注视的点）的位置。如不设置，那么摄像头将把目标设定为原点，即 x = 0, y = 0, z = 0的位置。
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时长: 如果时长为 0 或没有填入任何数值，那么距离、俯视角度和侧视角度会在程序运行时被立刻改变。反之，以上三个参数会随着时长而逐渐改变，直到变成被设置的参数为止，参数逐渐改变的过程会创造出一个动态的摄像头视角。
演示
在这个程序中，我们让摄像头围着物体旋转5秒。
https://cdncreaticodecom.b-cdn.net/scratch-gui-projects/forum/3e56cf3a-b9d5-479e-8748-d71aa1d7a2b8.gif" width="900" style="border-radius: 5px; border: 1px solid #29622d;">
你可以打开这个项目试试看:https://play.creaticode.cn/projects/64d3629d786c29288acc4218
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