Hi Tom, also you can calibrate MoI in a similar way like Colin describes above.

Something like - draw a 10 inch line, then zoom until your line matches 10 inches on a ruler and now you're calibrated and any dimensions that you draw will be at real size until you alter the zoom or viewport size.

- Michael

This is similar in concept, but adds some bells and whistles.
It's Free

IC Measure provides powerful tools for the manual measurement of circles, lines, polygons and angles. The convenient user interface enables the easy measurement of lengths, angles and surfaces directly from the image displayed on the monitor. Measurement data can be exported as CSV file.

IC Measure - manual on-screen image measurement and image acquisition

Dimension Images


Load photos from disk.
There is a toolbar tab that says "Microscope", think of it as my "Photo-Rig-Setup's" saved calibration.

Michael, the zoom factor cant be entered manually or even stored, am I right ?

Thats an amazing find - thank you !

Hi Tom, the zoom factor is part of the view definition, it will be saved when you save to a .3dm file and reload.

The zoom factor value for an ortho view does not have a spot in the regular UI for directly editing it but it can be accessed by script.

script: /* display top view zoom factor */ moi.ui.alert( moi.ui.mainWindow.viewpanel.getViewport( 'Top' ).fieldOfViewAngle );

script: /* set top view zoom factor */ moi.ui.mainWindow.viewpanel.getViewport( 'Top' ).fieldOfViewAngle = 30.0;

- Michael

Thats awesome.
So by entering the desired zoomfactor into the command line of the script I
can always return the "real world" size.

MOI feels like a silken glove - the smoothest workflow ever ;-)