EyeonTips:Manual/Fusion 6/3DChannel Boolean

From VFXPedia

• Unlike most tools in Fusion, the 3D Channel Boolean doesn't always require a background input. You can connect the Channel Boolean to a Replace Material node and use operands like the XYZ position, for example, to create a world position shader.
• YouTube video: Creating a Normals Shader using the 3D Channel Boolean tool.
• Connect a Background or Blinn Material with a solid "-1" color to the foreground input and select "A * B". This will invert the material's values which is useful to flip the normals of a normals shader.