unity raycast 2d

// detect object that was clicked using raycast

RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
 
if(hit.collider != null)
{
    Debug.Log ("Target name: " + hit.collider.name);
}

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3.8

David 95 points

                                    using UnityEngine;public class Example : MonoBehaviour
{
    // Float a rigidbody object a set distance above a surface.    public float floatHeight;     // Desired floating height.
    public float liftForce;       // Force to apply when lifting the rigidbody.
    public float damping;         // Force reduction proportional to speed (reduces bouncing).    Rigidbody2D rb2D;
    void Start()
    {
        rb2D = GetComponent&lt;Rigidbody2D&gt;();
    }    void FixedUpdate()
    {
        // Cast a ray straight down.
        RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up);        // If it hits something...
        if (hit.collider != null)
        {
            // Calculate the distance from the surface and the &quot;error&quot; relative
            // to the floating height.
            float distance = Mathf.Abs(hit.point.y - transform.position.y);
            float heightError = floatHeight - distance;            // The force is proportional to the height error, but we remove a part of it
            // according to the object's speed.
            float force = liftForce * heightError - rb2D.velocity.y * damping;            // Apply the force to the rigidbody.
            rb2D.AddForce(Vector3.up * force);
        }
    }
}

Thank you! 5

3.8 (5 Votes)

4.57

Aduku 135 points

                                    Physics2D.Raycast(Vector2 origin, Vector2 direction, float distance = Mathf.Infinity, int layerMask = DefaultRaycastLayers, float minDepth = -Mathf.Infinity, float maxDepth = Mathf.Infinity);

Thank you! 7

4.57 (7 Votes)

Consuela Albu 105 points

                                    using UnityEngine;public class Example : MonoBehaviour
{
    // Float a rigidbody object a set distance above a surface.    public float floatHeight;     // Desired floating height.
    public float liftForce;       // Force to apply when lifting the rigidbody.
    public float damping;         // Force reduction proportional to speed (reduces bouncing).    Rigidbody2D rb2D;
    void Start()
    {
        rb2D = GetComponent&lt;Rigidbody2D&gt;();
    }    void FixedUpdate()
    {
        // Cast a ray straight down.
        RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up);        // If it hits something...
        if (hit.collider != null)
        {
            // Calculate the distance from the surface and the &quot;error&quot; relative
            // to the floating height.
            float distance = Mathf.Abs(hit.point.y - transform.position.y);
            float heightError = floatHeight - distance;            // The force is proportional to the height error, but we remove a part of it
            // according to the object's speed.
            float force = liftForce * heightError - rb2D.velocity.y * damping;            // Apply the force to the rigidbody.
            rb2D.AddForce(Vector3.up * force);
        }
    }
}

Thank you! 1

4 (1 Votes)

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