I am very interested in learning this now that I am into Fusion. Is it easy to export a WPP file from Blender?
Yes it’s easy. I don’t know what values Fusion expects, but it’s rather easy to recalculate if you had a need to.
In Cycles - create separate render layer and use material override. The material to be used as this should be just emission shader with “Position” output of “Geometry” node plugged into the emission color.
The values you’ll get will give you X position in Red channel, Y in Green and Z in Blue in Blender Units. This means you’ll have positive and negative values and of-course some values above 1.0.