Hello, thank you for getting in touch!
Our Outline implementation should be working for cubes, as you can see in the image below, could you please provide additional details regarding the issue you're having?
Note: Our technique can only function properly in Forward mode, using it in Deferred may lead to all sorts of issues.Are you using the
Outline node for a custom setup, or simply setting the parameter in the
Output Node?
If you could also share a screenshot or video for the effect you're trying to achieve we could point you in the right direction, thanks!