How can we split a projector projection?

Question

Here's the thing:

We wish to display the same browser window, on a wall, however, it needs to be masket only on certain points of that wall.

So, in between the wall, there will be some objects that we wish NOT to have the projector to project, like so:

------------------------ WALL ------------------------

|content| real flower |content| real flower |content|

We can connect a PC, with a graphic card with 3 outputs, OR we can have 3 graphic cards, with 3 projectors, and perhaps that will work but, does anyone know a way for doing this otherwise? For example, using one single projector?

Thank you in advance

Answer 1

Masking the projector lens will not work because you will end up with blurred boundaries, the mask would have to be at a point where the image is focused, either inside the projector, or at the wall, unless you rigged up some fancy external lens system with a mask at a point where the image was focused then a second lens to focus the image on the wall which is not very practical.

You could try to simply overlay 2 black bars on the content you wish to display on the wall as black on a projector is the absence of projected light(in ideal conditions). In practice there would be some light bleed but it would be similar to shining a light on the wall. You may even want to try white bars which would light up the flowers but still block the website content at that point.

To make the bars you may need to create a program that can display its window on top of the window you are using to show the website, a simple c# application could probably do this and would not require much coding knowledge.