This node creates an alpha composition between two color maps at locations defined by a mask.
The principle of the Alpha blend is as follows:
To add a node, right click in the Graph Editor and select Create Node > Color management > Alpha blend.
Link the Alpha blend node to three input nodes: two color maps and a mask.
When you click on the Alpha blend node, the color map is shown as a plane image in the 3D view.
At each vertex:
Both input color maps and the input mask may have different sizes and resolutions. The size and resolution of the output color map is determined by those of the first color map, and the second color map and the mask are enlarged or reduced so that their size corresponds exactly to the size of the output color map.
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