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Chapter 20. Rendering > Multipass Rendering

Multipass Rendering

Several reasons exist for using multipass rendering, the first of which is to give the compositor more control of each element. This is especially important when you are trying to wedge CG elements into a live-action background. You would also use multipass rendering if you needed to revise certain elements. Creating everything in layers gives you the option of rerendering only what is needed, rather than the whole scene. Another reason is that certain effects can be completed only in compositing, so it is absolutely a requirement to render that element as a separate pass.

Render Layers

Render layers are like display layers, except that they tell the renderer to render only what is in that layer. If multiple render layers are enabled, the renderer still saves a separate file for each of those render layers. A convenient feature of this is that the render can create directories for each sequence. Even if you are not rendering separate passes, you might want to use this feature just for the automatic output directory. In Render Globals, Render Layer/Pass Control, if you check on Enable Render Layers, you will get a list of render layers (see Figure 20.22).


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