Problem with raycastHit and rigidbody!

Unity Engine
1

Hey guys,

I have coded a small crosshair script and now i want to add so that my crosshair changes to another texture when you hover over any rigidbody object in my scene. I am not getting any error messages which is a good sign but neither am i getting any progress.

Heres my script:

var CrosshairTexture : Texture2D;
var InteractIcon : Texture2D;
var Crosshairisenabled = true;
var CrosshairsizeX : int = 64;
var CrosshairsizeY : int = 64;
var hit : RaycastHit;

        function OnGUI(){
       
        GUI.DrawTexture (Rect(Input.mousePosition.x-CrosshairsizeX/3, (Screen.height-Input.mousePosition.y)-CrosshairsizeY/3, CrosshairsizeX, CrosshairsizeY),CrosshairTexture);
        }
   
        Screen.lockCursor = true;
       
        function Update() {
       
        var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        var hit : RaycastHit;
        if (Physics.Raycast (ray, hit, 100)) {
       
        InteractIcon == true;
        }
}
2

InteractIcon is a Texture2D type, not a boolean, so I’m not sure what InteractIcon == true is supposed to do. You’re also testing for equality (==) instead of assignment (=), so that’s another issue.

3

You’re probably looking for something like this:

var crosshairTexture : Texture2D;            
var interactIcon : Texture2D;          
private var currentTexture : Texture2D;         // The current texture to draw
var crosshairsizeX : int = 64;
var crosshairsizeY : int = 64;

        function Start() {
                currentTexture = crosshairTexture; // Set default texture;
        }

        function OnGUI(){
                GUI.DrawTexture (Rect(Input.mousePosition.x-crosshairsizeX/3, (Screen.height-Input.mousePosition.y)-crosshairsizeY/3, crosshairsizeX, crosshairsizeY), currentTexture);
        }
       
        function Update() {
                var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
                var hit : RaycastHit;
                if (Physics.Raycast (ray, hit, 100)) {
                      currentTexture = interactIcon; // Set interact texture 
                } else {
                      currentTexture = crosshairTexture;  // Set default texture
                }
        }
4

Thanks for the quick responses! I have somewhat managed to make it work by adding some additional lines of code but now the icon appears on ANY object at 2 meters distance (which makes sense according to the code) and not ONLY rigidbodies… any ideas? I know you can use tags to rule out colliders for this but there must be a way without them. Sorry im more of a modeler than a scripter…

var crosshairTexture : Texture2D;         
var interactIcon : Texture2D;       
private var currentTexture : Texture2D;         // The current texture to draw
var crosshairsizeX : int = 32;
var crosshairsizeY : int = 32;
       
function Start() {
                currentTexture = crosshairTexture; // Set default texture;
        }
        function OnGUI(){
                GUI.DrawTexture (Rect(Input.mousePosition.x-crosshairsizeX/3, (Screen.height-Input.mousePosition.y)-crosshairsizeY/3, crosshairsizeX, crosshairsizeY), currentTexture);
        }
    
        function Update() {
             
                var fwd = transform.TransformDirection (Vector3.forward);
                var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
                var hit : RaycastHit;
                if (Physics.Raycast (transform.position, fwd, 2)) {
                      currentTexture = interactIcon; // Set interact texture
                } else {
                      currentTexture = crosshairTexture;  // Set default texture
                }
        }
5

You can check the hit if it has a rigidbody.

            if (Physics.Raycast (transform.position, fwd, hit, 2)) {
                if (hit.rigidbody != null) { // Does the hit have a rigidbody?
                    currentTexture = interactIcon; // Set interact texture
                } else {
                    currentTexture = crosshairTexture;  // Set default texture
                }
            } else {

Also, if you don’t use the ray for anything

var ray = Camera.main.ScreenPointToRay(Input.mousePosition);

is not needed.

6

Also

transform.TransformDirection(Vector3.forward);

is the same as

transform.forward
7

I added

if(hit.rigidbody!=null){

and it seems to work, yet it seems like the icon is a bit glitchy.
If i look at the rigidbody from the distance that i entered it does transform the crosshair yet when i look at it and walk backwards and then look away the interacticon stays on screen…

8

Do you set the interacticon both when you miss any colliders and when you hit, but not a rigidbody?