raycast in unity in csharp

To cast a ray in Unity using C#, you need to use the Physics.Raycast() method. This method takes in a Ray object and returns a bool value indicating whether the ray hit something or not.

Here's an example of how to do a raycast in Unity using C#:

main.cs
// Define a ray starting at the camera position and going in the camera's forward direction
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

// Create a variable to store the hit information
RaycastHit hit;

// Check if the ray hit something
if(Physics.Raycast(ray, out hit))
{
    // Do something with the hit information
    Debug.Log("Hit object: " + hit.collider.gameObject.name);
}
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In this example, we are casting a ray from the camera position towards the mouse position on the screen. If the ray hits something, the hit variable will be filled with information about what it hit. We can then use this information to do something in code, such as print the name of the hit object to the console using Debug.Log().