How to find out if player is aiming at a holo?

[Nikita]

Once again I fail at angles. Is there any formula that I can use to know if or not a player is aiming at a certain holo with arbitrary coordinates?

[Hitman271]

aimEntity( holoEntity( whateverHologramIndex ) )

[jacoby6000]

This will give you the angle part, you can make the tolerance stuff urself I think.

TargetAngle=Player:shootPos()-holoEntity(I):pos()
CurrentAngle=Player:eyeAngles()
if(CurrentAngle:inRange(TargetAngle-Tolerance,TargetAngle+Tolerance){
 Player is aiming at holo
}else{
 Player is not aiming at holo

[timas]

Oh god, i did all theese calculations with trigonometry xD Didden't know it whas this simple.

[Nikita]

Sorry, neither works because there is no inRange for angles, and aimEntity does not accept an entity as a parameter except the one before ':'.

Thanks for Player:shootPos() though, I totally forgot about that one.

[Magos Mechanicus]

First up, use a vector dot product to get the angle between the player's camera facing and the direction from the player to the hologram.
Toholo = Hologram:pos() - Player:shootPos()
Angle = acos( Player:eye():dot(Toholo:normalized()) )

Now, you could just check whether the angle is smaller than a fixed amount, but if your hologram is very far away it might be within 5 degrees or whatever even though you're pointing far away from it. To compensate for that, we need trig. We know (or at least can get with holoScaleUnits(Index) ) the size of the hologram. For the most simplistic collision checking, we can assume the hologram is a sphere with this radius. So we draw up a right triangle where one side is the line from player to hologram and the other is that radius, then use arctangent to find the angle we're missing. Now we have an angle tolerance that scales to the hologram's distance from the player.

Radius = holoScaleUnits(Hologramindex):length()
Angletolerance = atan( Radius/Toholo:length() )
if(Angle < Angletolerance){ Player is looking at hologram, do stuff }

[Lyinginbedmon]

I just use

Des=Holo:pos()
Pro=Owner():shootPos()
Pro+=Pro:distance(Des)*Owner:eye()
if(Pro:distance(Des)<=X){do stuff}

[Divran]

I just use

Des=Holo:pos()
Pro=Owner():shootPos()
Pro+=Pro:distance(Des)*Owner:eye()
if(Pro:distance(Des)<=X){do stuff}

Me too.

I even did this for my lua aimbot (which I made yesterday) to determine who is closest to my crosshair and then lock on to that person (edit: note: closest to my crosshair, not aimpos. edit2: imagine a line drawn from my crosshair to my aimpos. whoever is closest to that line that's better explained.)

[Nikita]

Thanks Magos, that really helped!

You are all nice!

[Syranide]

If you want to know ONLY when a player has the target on a holo, check out "ray-triangle/quad/cube/etc intersection" equations.

Otherwise, "ray point-distance" equqations can be used to just know how far off you're aiming. Meaning, you can for instance use the size of the holo to estimate a radius.