Doors vs. sandbags coverage

[Harry_Dicks]

Cover depends on the angle. In the lux3y's last screenshot the shooter isn't standing in a straight line from the target but some tiles to the right. At a certain angle cover values decrease. lux3y found a sweet spot where the door still grants its maximum cover (75%) like at a frontal angle but the sandbag to the right also comes into play (13%). The number above (Cover 22%) is the result of adding up multiple cover values with diminishing returns and substracting that from 100 %, in this case: firstCoverSource + ((1 - firstCoverSource) * secondCoverSource)  = 0.75 + (1 - 0.75) * 0.13 = 0.75 + 0.0325 = 0.7825. 100% - 78,25% = ~22%.

This part is a bit confusing because Cover 22% would be better stated as Cover 78% but in the end this does reduce the shooter's hit chance to 22% of whatever it was before cover was applied. If you check ingame setups you want the "Cover" value to be as low and the "X stops" value as high as possible.

To illustrate the effect of the angle I replicated the setup and changed the shooter's angle 4 times:
https://imgur.com/a/ZLBBI

Edit: I realized I am not exactly sure which sandbag grants the additional 13%. It might not be the one next to the door but one in the row in front of it. You could check easy enough by only building 1 sandbag at a time and checking the result (GodMode recommended).

Thank you so much for the visual diagram. I don't think I would have ever understood it with just a description