in this scene I simply changed the cameras viewport from:
X: 0 Y: 0 W: 1 H: 1
to a possible split screen setting (with two or three cameras, like here):
X: 0 Y: 0 W: 1 H: 0.7
But then the ray cast does not work correct anymore (wrong click/touch position).
I tried to figure out how to change the script but found no solution so far.
Any help would be appreciated.