In fact, to be precise: 6.28 = 2x pi, the well-know value: 3.1416, 3.141592, etc.. . The values I remember are 1.57, 3.16, 4.7, nearly a quarter turn each time, and... 2.2 ?.... I don't know why but using this value, I have often stumbled upon a nice-looking situation with hdrihaven's bitmaps... The units are the radians, with the 0 on your right (counter-clockwise), but you may as well enter a negative value: -1.57 corresponds to 4.7.

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