Cave and addtexquad

[istarion]

Hey

I have a 3-wall cave and I'm trying to figure out how to put a texture/plain coloured overlay over the scene. The goal is to provide an "emergency switch" to black out the cave in case of a nausea attack or similar, and later on some progress information.

In the single display setup this works:

blackout = viz.addTexQuad(parent=viz.ORTHO)
blackout.color(viz.BLACK)
blackout.drawOrder(-1)
blackout.setBoxTransform(viz.BOX_ENABLED)

In the cave this only places the black texture over the centre projector, not the two side walls. How do I get this to blackout the sidewalls as well?

thanks and cheers