Hi FDP, are you referring to the size readout in the properties panel in the upper-right corner of the window, that shows up when an object is selected?
That size is obtained from the display mesh bounding box, so it's not going to be accurate to a high number of decimal points. If you set your decimal display precision under Options > General > "Decimal display" to 2 decimal places it would then probably display better in this case.
That size uses the display mesh so it can give a result very quickly - that part of the UI is updated whenever you change selection and calculating an accurate bounding box can be a somewhat time consuming operation. When you click on it though, MoI will do a high accuracy calculation at that time so the result in the popup menu will be more accurate.
I guess probably a good solution would be to do a high accuracy calculation on a background thread so it wouldn't make the UI potentially stutter on every selection change. However, this is a pretty sensitive thing to get right because of things like the possibility of the background thread still processing things while the object is deleted. So it's something that will require a fair amount of effort.
- Michael
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