NukeStudio: Clip/Track additive blending

For anyone wanting to do additive track blending in NukeStudio v10+, here's a step by step.

1.  Starting with two over layed tracks.  By default the top one takes precedence and hides the lower one.



2. Convert the top track to a blend track via the right mouse button menus.  The track header should turn blue.



3. Right mouse over the overlay clip add a BlinkScript soft effect.



4.  Expand the code section, press Clear to remove the default code.  Then copy and paste my code and hit Recompile:




5.  Switch to the Kernal Parameters tab.  Here you will be able to multiply the RGB and A of the overlayed clip, as well as separately controlling an overall Alpha and RGB gain.  Setting Alpha gain to zero is the quickest way make the clip additive.  (Note that these parameters multiply against each other.)



6. You can add other soft-effects, like transforms, other grades etc and things should behave as expected.




Please add a comment if you give this a go.  I would be interested to know if this is useful.

Cheers,

Jeff