I am trying to shoot a ray from an game object on a canvas.

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alt text Hey! I am trying to shoot a raycast from a UI image but I cannot figure out how to do so. I have tried using a graphic raycaster but I only was able to get it to shoot from my mouse position. I've attached an image to further show my issue, the red dot is where I need the ray to be shot from and the blue arrow is the direction it needs to go. Does anyone know of any solutions?

Answer 1

Answer by Aluminum18 · Jan 05 at 03:47 AM

 Vector3 screenPoint = yourMainCamera.WorldToScreenPoint(yourRedDotTransform.position);
         Ray aimRay = yourMainCamera.ScreenPointToRay(screenPoint);
         Physics.Raycast(aimRay, out var hit, _maxRayDistance);
 
         // Do something with hit object

The idea is to convert your reddot position in scene into position in screen, then use screen position to do raycast

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LizardLair · Jan 05 at 04:38 AM 0

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Hi, I've used that but it doesn't seem to be working.

 if (Input.GetMouseButtonDown(0))
             {
                 Vector3 screenPoint = cam.WorldToScreenPoint(ringOneLine.transform.position);
                 Ray aimRay = cam.ScreenPointToRay(screenPoint);
     
                 Physics.Raycast(aimRay, out var hit, maxRayDistance);
                 Vector3 forward = ringOneLine.transform.TransformDirection(Vector3.forward) * 100;
                 Debug.DrawRay(ringOneLine.transform.position, forward, Color.red);
             }

I am trying to shoot a ray from an game object on a canvas.

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