Double stack and soft edge problem

[arighetto]

Hi everybody,
i found what I think is a buggy behaviour when using 4 projectors configured as a double stack (to increase brightness) and soft edge (to cover the whole projection area).

Projectors are set up so 2 are assigned the "left slice" and the other 2 the "right slice". The overlapping area is of 25% of projector rasters. The size of the composition is of 3360x1080 px.

When the secondary (stacked) projectors outputs are turned off the soft edge is correct and you can see the gradient on the central part of the screen.

When turning on also the "stack" projectors the central part remains correct but the bottom or the top part of the slice also shows a gradient and that is not correct. This happens when 2 slices of 2 different projectors overlap perfectly. In this way when all 4 projectors are turned on there will be a gradient fading to black on the lower part of the projection area.

I attached some screenshots to show the problem.

Do you have any idea on how to solve this problem?
It would be really nice if you could add a feature to disable the soft edge on certain sides of the slice.

Alberto

[elgarf]

Hi.

You can make virtual screen, which mirrors composition and set Input source of top slices to virtual screen.
Or make invisible layer router on top of composition.

Main idea is make different input sources on different soft edge groups.

[arighetto]

Thank you elgarf, your solution works really well.
I get the best fps performace when using the virtual device to mirror the composition. It's also more straightforward than layer router.


For future reference on this topic here it is a short explanation with screenshots:

- Create your composition (for example 3360x1080 px)

- Set up a virtual output with the exact size of your composition and call it "COMP_MIRROR"

- In COMP_MIRROR create only one slice taking the whole composition area and "Composition" as input source

- Check that the output transformation covers the whole area

- set up the first projector of the "left stack", with only one slice and "composition" as input source. Don't forget to turn on "Soft Edge" checkbox

- set up the second projector of the "left stack", with only one slice and "COMP_MIRROR" as input source. Turn on Soft Edge

- Do the same with the right part of the stack

- Assign outputs to your phisical projectors

- Use "Ouput Transformation" to get the stack (and soft edge) perfectly aligned


Alberto