I think you are roughly right, but it isn't quite as obvious as you make out: there are a few sensible options. Sil uses the NPP system:
1) X has LOS on Y if and only if there is a line from the centre of X to any part of Y
2) X has LOF on Y if and only if there is a line from the centre of X to the centre of Y
So LOF is symmetric, but LOS isn't. This seems to work pretty well. Note that there is a very good thread on this somewhere on this forum.
Either of them could be logically asymmetric as one's eyes (or hands) are smaller than one's body. e.g. there are many cases where people are hiding between pillars, trees, corners etc where one person can see part of someone else's body but the other person can't see them.
That said, I'm in agreement that the current V system is not good.
1) X has LOS on Y if and only if there is a line from the centre of X to any part of Y
2) X has LOF on Y if and only if there is a line from the centre of X to the centre of Y
So LOF is symmetric, but LOS isn't. This seems to work pretty well. Note that there is a very good thread on this somewhere on this forum.
Either of them could be logically asymmetric as one's eyes (or hands) are smaller than one's body. e.g. there are many cases where people are hiding between pillars, trees, corners etc where one person can see part of someone else's body but the other person can't see them.
That said, I'm in agreement that the current V system is not good.
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