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We can access all the MXI buffers using the MXI extractor. It is an effect plug-in, so first add your MXI footage into a comp, and then apply the “MXI Extractor” effect to the layer. Then, you can “extract” the buffer you want.
Extracting the environment light from an MXI
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The “Channel” parameter allows you to select the buffer, and the “Light” parameter indicates the light buffer you want to use. Using the “Light” parameter only makes sense when you select “Light” or “Shadow” in the “Channel” parameter.
Extracting light number 1 from the MXI
Channels available
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in the MXI files:
- Render channel
- Light channels (if Multilight was enabled).
- Alpha channel
- Object ID channel
- Material ID channel
- Shadow channel
- Motion channel
- Roughness channel
- Z-buffer channel
- Fresnel channel
Creating comps from an MXI footage
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- A comp named “All layers” containing all the buffers that the MXI has.
- A folder named “Comps” containing all the buffers that the MXI has separated.
- A comp named “Multilight” containing all the light buffers in “linear dodge” mode. Furthermore, the “Exposure” effect is applied to each light buffer to adjust the intensities easily.
- A comp named “Multishadow” containing all the shadow buffers.
Multilight comp. Note that the light buffers are blended in “linear dodge” mode