Trigger something when the player looks in a specific direction.

[lxFirebal69xl]

I was looking to create a specific segment for my game that had a trigger happen when the player looked at something (it could be a model or a pivot, either would work).

Thing is how would this be possible? Since we're talking about the player's vision and not collision I have no idea how to even start doing this.

 

 

Here's an example, where you see the player running around everywhere, but only when he looks in a specific direction (in this case, up) does something happen.

[thehankinator]

Stupid back button, lost everything.

 

The easiest way would be to create a trigger zone with a script that takes an entity as a property (this is the object you are checking for, don't use a pivot) do a world:pick from the camera to a point some distance in front of the camera and check if it is the object you are looking for.

 

Disclaimer: I didn't even try to run this code so there could be syntax/logical errors but the concept should work.

 

Script.object = nil --entity

function Script:Collision(entity, position, normal, speed)
 --todo add guards to ensure we only try this with the player
 local p0 = entity:GetPosition(true)
 local p1 = Transform:Point(0,0,20,entity.script.camera,nil)--change 20 to whatever max distance you want it to trigger with
 local pickInfo = PickInfo()

 if world:Pick(p0, p1, pickInfo, 0, true, Collision.LineOfSight) then
   if pickInfo.entity == self.object then
     --do something scary
     --hide to prevent triggering twice
   end
 end
end

 

Another way:

Get the difference between the camera's position and the object, get the rotation of the camera then get the dot product(Vec3:Dot()) of the two. Might get awkward but you could use a pivot.

[Rick]

As hank said use a pick, but you can also pick from the camera itself (where the mouse position is the center of the screen). No need for that specific example to use the world and Transform:Point(). Same idea, just an alternative way to do it.

 

http://www.leadwerks.com/werkspace/page/api-reference/_/camera/camerapick-r199

[Josh]

Use the Draw() script function, together with a distance check maybe.