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1 Select the Ext Matte you want to transform.
2 Open the Key palette, and turn off the Lock Matte checkbox.
3 Use the Pan, Tilt, Zoom, Rotate, Width, Height, HFlip, or VFlip parameters to adjust the matte so it has the correct geometry.
It’s worth mentioning that you can attach as many external mattes to a single clip in DaVinci Resolve as you like. For example, if a CGI shot has been delivered with a set of isolation mattes for each of three characters in the scene, you can import all three mattes and use them to isolate adjustments that you want to make in the Node Editor.
Extracting External Mattes from OpenEXR Layers
OpenEXR media is capable of containing multiple layers and multiple alpha channels, which can also be accessed from EXT MATTE nodes. As a result, DaVinci Resolve uses a slightly different but related procedure for accessing these mattes.
1 Right-click any node, and choose the .exr clip name from the Add Matte submenu of the contextual menu.
By default, the EXT MATTE node that appears has its first output connected to the Connect one of the EXT MATTE node’s triangular key outputs to the key input of a node you want it to limit.
2 Double-click the EXT MATTE node to select it, then right-click it and choose which layer you want to use from the Select Matte submenu.
Right-clicking an OpenEXR file’s EXT MATTE node to choose which layer to use
OpenEXR files with multiple RGBA layers (or passes) embedded within them (RGBA + RGBA + RGBA and so on) or OpenEXR files with multiple alpha channels (RGBA + A + A) expose multiple entries in this submenu. Whichever one you choose is the layer that will be used as a matte by that EXT MATTE node.