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All the cameras need to have a good and clear view of the projection object. The image also needs to be in focus.
Iris focus ring
You can adjust the focus rings on the camera itself and while doing it keep clicking on Refresh the texture button.
Enabling Circles and lines override might help you achieve a precise focus.
Camera’s view of the projection object with Circles and lines content override active on the projector.
Good to know: Once you ensure the focus, it is recommended to tighten the screw a bit, so that the focus doesn't change.