AI FOV's - GameCreators Forum

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FROGGIE!

21

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Joined: 4th Oct 2003

Location: in front of my computer

Posted: 26th May 2004 18:18

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How can you tell if an enemy is looking at you

?

eg. You can stand behind him but not in front(or 45 degrees either side of the front) without him knowing.

im only using the X+Z axis so you dont need to bother with the Y axis.

I should have changed my signature when asked

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TEH_CODERER

21

Years of Service

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Joined: 12th Nov 2003

Location: Right behind you!

Posted: 26th May 2004 19:16

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I'm not very good at AI either so here's what i'd do:
Make an object like this:

+ Code Snippet

  /|
 / |
/  |
\  |
 \ |
  \|

Then position it in front of your enemy (hidden).
Then if there is a collision between that and the player then it can see you.
Hope that helps.

Current Projects: Dark_Worlds_Map_Editor version0.1 [email protected]

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Macrosii

21

Years of Service

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Joined: 31st Mar 2004

Location: Essex, UK

Posted: 27th May 2004 22:17

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Maybe use dot produect to calc angel between the two. Something like.

Set Vector3 ShipVector, Object Position X(you), Object Position Y(you), Object Position Z(you)
Set Vector3 EnemyVector, Object Position X(Enemy), Object Position Y(Enemy), Object Position Z(Enemy)
phi#=dot product vector3(you, enemy)
anglebetween#=acos((phi#)/(length vector3(targvector) * length vector3(shipvector)))
if angle between < FovAngel /2 then seeyou$ = "yes"

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NathanF

21

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Joined: 24th Mar 2004

Location:

Posted: 28th May 2004 01:45

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The easy way is to position the camera on the AI, and rotate it right. Then check if the player is on the screen, and move back the camera.

.........what's the point of reading this?

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DarkBASIC Discussion / AI FOV's