Make an FPS gun point at the mouse position.

Question

Hi,

Im new to unity and trying to make an on rails shooter, similar to time crysis or house of the dead. I also want the gun to be displayed on the screen but to point at where the mouse is, similar to how it does in red steel on the wii.

My problem is that I cant get the gun to reliability point at the cursor.

I found some usefull code HERE

private var targetPlane : Plane;

function Start(){ targetPlane = Plane(Vector3().up, 0); }

function Update () {

var ray = Camera.main.ScreenPointToRay(Input.mousePosition); var dist : float; if(targetPlane.Raycast(ray, dist)){ var pos = ray.GetPoint(dist); transform.LookAt(pos, Vector3().up); } }

This works well, except you cant point the gun up. So i changed Vector3().up to Vector3.().one. Now the gun can point in all directions, untill the camera faces back on itself from the starting position, when the gun will no longer follow the mouse at all.

Im using some code that I found HERE to move the camera from point to point, if its any help.

Ive been surching through the unity forums and pulling my hair out for best part of two days now. All Ive managed to figgure out is that Im 99% sure its something to do with where the plane is drawn and not being able to see it when the camra is rotated.

Thanks in advance!

Answer 1

Best Answer

Answer by Eric5h5 · Mar 04, 2010 at 08:39 PM

Try using ScreenToWorldPoint:

var zDistance = 10.0;

function Update () {
    var mousePos = Input.mousePosition;
    transform.LookAt(Camera.main.ScreenToWorldPoint(Vector3(mousePos.x, mousePos.y, zDistance)));
}

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orv · Mar 05, 2010 at 11:53 AM 0

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Yep, that it it. Thanks very much!

jeanRicK · Dec 21, 2010 at 09:48 PM 0

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Quick question... I am trying to use this method to achieve something similar (if not the same thing). Basically, I'm trying to get a gun to point at the cursor, however, when I use this method it feels like the gun isn't pointing at the cursor directly all the time especially as it moves from the 'center' of the screen. It feels like it has to be scaled to fit the screen or something. Is this normal and if so how do you fix this?

Eric5h5 · Dec 21, 2010 at 10:52 PM 0

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@jeanRic$$anonymous$$: try setting zDistance to different values.

Answer 2

Answer by caden-burleson · Jan 31, 2017 at 08:26 PM

What about if It's a third person character an I have the gun parented to the character. It seems that the guns rotation starts off in the wrong rotation and isn't following the target properly....

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Make an FPS gun point at the mouse position.

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