Raycast stealth enemy?

pseudocode... (for a left/right horizontal field of view check, once you learn how this works, you can do another check for up/down field of vision).

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1) make a vector from ai to player Vector3 look = (player_Pos - ai_Pos).normalized;

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2) take ai's transform.forward vector

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3) set y=0 for both vectors, and re-normalize both. (so we jsut do x/z plane check), for left/right field of vision check....

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4) do a Vector3.dotProduct(vec1,vec2) this gives you the cosine of the view angle between Ai's forward vector, and the vector towards the player. (a single value representing angle) result of 1= looking exactly at player. 0= 90 degrees, -1 = looking backwards (180 degrees)

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so now you can just compare that result with cos on angle you want to set for the AI's view angle... If you want your AI to have 180 degree vision just check if the dotProduct result is >0 to see if they can potentially see the player. Then add a raycast if you want to see if obscured by other geometry.

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The dotProduct check is a good first optimization also, to do before doing the raycast.