how to run a function when player is looking at that entity?

[dull vortex]

execute as @a at @s facing entity @e[type=custom:entity,r=50] feet positioned ^^^1 rotated as @s positioned ^^^-1 if entity @s[r=0.7] run function customfunc

[dull vortex]

if ur looking at a entity with the identifier "custom:entity" thats within a 50 block radius of u, it runs "customfunc"

there might be better ways to do this, but this is the easiest method ik lmao ( easiest for me to setup and understand dat is )

[dull vortex]

it also doesnt check for blocks, this means if u "see" the entity through blocks, it's still gonna run the function even if u didnt actually see him

[slow quartz]

😡