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烘焙是根据模型和uv得到的一张uv贴图
把场景中的一些信息，比如着色信息、模型信息、动画信息、物理解算信息等，变成贴图或关键帧的过程。可以导出供其他软件/工程使用，或是减少最终渲染时的运算量，提高最终渲染的运算速度。
Maya烘焙前的准备工作：
1，检查UV是否合理；
2，将UV重叠的部分移动到UV线框外；
3，将面的Normal 使用Soften Edge；
4，根据UV的切分设置软硬边；
5, 所有模型的材质球设置为Lambert 1 。
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