Sorry about the OT, but I couldn't think where else to ask, I am using
OpenSCAD to design and build a Pick-and-Place machine.

This will have a microscope/webcam and I need to set (calibrate) a
target point that is then fixed to the window irrespective where the
window is on the screen.

I have found several windows apps but they all set the cross-hair on the
screen, not the window.

Can anyone suggest a way of doing this, or perhaps suggest a
webcam/microscope app that has cross-hairs ??

Again, sorry for the OT,
Dave

This is very simplistic but can be run without installing it. I've only tried
the zip file with the Windows version.
http://www.imajeenyus.com/computer/20130529_webcam_crosshairs_processing/index.shtml

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Another one. Didn't try this yet.
http://kavionic.com/blog/pixmicro/

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