Would say that the function that calculates the outline breaks on the concave top / bottom.
The reason I think so is the shadow part in the middle, right, where you see the bottom shadow stretch out. But you see as well, that a part is missing of it although the outline of the barrel is not "inexistant" there. It looks like the concave part was just cut out on shadow calculation.
The reason I think so is the shadow part in the middle, right, where you see the bottom shadow stretch out. But you see as well, that a part is missing of it although the outline of the barrel is not "inexistant" there. It looks like the concave part was just cut out on shadow calculation.