目标渲染纹理。
一般情况下,摄像机直接渲染到屏幕,但对于某些效果,
将摄像机渲染到纹理会非常有用。为此,可以创建一个 RenderTexture 对象,
在摄像机上将其设置为 targetTexture。随后,摄像机就会渲染到
该纹理。
当 targetTexture 为 null
时,摄像机渲染到屏幕。
当渲染到纹理时,摄像机始终渲染到整个纹理中;实际上,
rect 和 pixelRect 将被忽略。
也可以使用 SetTargetBuffers 函数,让摄像机渲染到单独的 RenderBuffers,
或同时渲染到多个纹理。
另请参阅:RenderTexture、SetTargetBuffers。
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