What is the origin from these vehicle values?

[Nomada_Firefox]

Looking how there are values in mm for the armor and some new angle values, I am curious what was the source for them. Because I can use the armor values from older game but I have not idea about the angles.

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hull front upper mm	hull front upper angle	hull front lower mm	hull front lower angle	hull side upper mm	hull side upper angle	hull side lower mm	hull side lower angle	hull rear upper mm	hull rear upper angle	hull rear lower mm	hull rear lower angle	hull top mm	hull top angle	hull bottom mm	hull bottom angle	turret front mm	turret front angle	turret side mm	turret side angle	turret rear mm	turret rear angle	turret top mm	turret top angle
 

[SteveMcClaire]

The armor plate thickness and angles come from a number of sources -- some books and some online. I tried to use primary sources (like the US Army technical manuals and the Standard Army Ordnance Catalog) wherever possible. You can find this data out on the internet on various tank-related sites too. The angle value in the game is 'angle from vertical' so a vertical plate (90 degrees from horizontal) would be a 0 angle in the data file. A plate at 60 degrees from horizontal would be 30 degrees from vertical, etc.

Armor values in the older 2D games were pre-calculated based from this same plate angle and thickness data but (because of the limits of the 2D model) had to assume certain impact angles depending on the vehicle facing and high/low incoming angle.

[Nomada_Firefox]

Thanks by the explanation.