Multi-destination screen streaming

[flightmansam]

What is the feature:
Implement BetterDisplay to be able to stream a virtual display to two destinations (with per-display custom cropping available). For an extra bonus, bundle this into a macro/plugin that can auto-detect how to configure two selected displays to be a "super-display".

Rationale:
I have a use case where at work I have two small 24" 16:9 1080p monitors (yuck!). I rotate them both 90º and butt the thin bezels together to make a 18:16 (9:8) screen. I then have been using BetterDisplay to make a virtual display that is 9:8 and 2160 x 1920 and then stream one half of that screen to on of my physical monitors and then PiP the other half to the other monitor (using screen cropping). This works fine, but would be nicer just to be able to stream both together as the PiP is cumbersome and then is put into a macOS 'space'.

[waydabber]

Somewhat related to this: #200

[alexykot]

Do want! 😃

I'm looking for the same feature, applied to a different use case.

I need to create an extra-large projected surface for creating 1:1 full-scale blueprints output. I use two HDMI projectors with 1920x1200px resolution each, stacked together into a 1920x2400px overall visual space. The IRL size of the combined projection is 2800x3500mm.

Right now to output a blueprint on this double-projector setup I split the blueprint image file in two horizontally, and output top and bottom part on it's own projector.

Ideally, I want to be able to merge these two projectors into a single virtual screen that I could use as one desktop space.

I didn't try the solution OP described above (didn't find it), but would be great to have this supported out of the box as an intended use case, rather than shoehorn unrelated features to make it work.

[waydabber]

Will work similar to this:

#2965

[waydabber]

[alexykot]

@waydabber Awesome! Thank you! When do you think 3.4.0 may be released?