Because of things like this, it's always good to know what formats your post processing application can support. Even though many formats like the EXR or PSD support layers if you are working with After Effects than you'll want to disable this feature as After Effects does not deal with Multi-Layered files like this in a manner you would expect. Next, you have a check box for a "Multi-Layer File" this will fold all the passes into a single file with each pass as a layer with in that file. Now, you can actually create 16 bit the EXR's, but this is been hidden away and can only be accessed by clicking on the options button.
MULTIPASS RENDERING 32 BIT
When working with OpenEXR you don't need to worry about the bit depth drop down as 32 bit is the only option there. In this case, "OpenEXR" this format is considered an industry standard, and will work great in almost every case where you need to render to a 32 bit format. Once you've set the file path you will then want to set the format to something that supports 32 bits per channel. Then make sure to set the file name to "cv_rocket". So, click the open file dialog button and then create a new folder called "cv_rocket_mp".
Now, depending on how you work you can just copy & paste the file path from the regular image section into the file path for the multi pass image, but you might also want to set a different path. By clicking the check box you will activate the attribute for saving a Multi-Pass image. If you look just below the save tab in the render settings you can find the Multi-Pass tab, and to the left of the name you'll see a check box. So, you need to activate multi-pass first. Now, if you click on the save tab you'll see the previous settings that you set for the regular image, but nothing that relates directly to Multi-Pass. So, to get started you'll want to go to the render settings to set the save path for the passes, and to select which passes will be rendered. This means that you have a lot of control over the look of things like the brightness of reflections or speculars, the brightness of the glow, or the density of shadows. Now, Multi-Pass rendering allows you to extract each of those passes, and then manually combine them together in a post processing application.
These passes are then blended together internally, and a final image is displayed to you. First, what is Multi-Pass rendering? When a render is calculated it is done so in passes so it starts by calculating the surface texture of an object, then the diffuse lighting, and then the speculars, than reflections and so on.
MULTIPASS RENDERING HOW TO
You'll also learn how to determine which image passes you'll need to render. In this video you'll learn how to adjust to render settings set in the previous video for when you want to work with multi-pass rendering.
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