How do you get a Entity to follow your mouse cursor?

Unity Engine
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1

I can’t seem to get this right. The cube I made just goes off in a weird direction.

Can anyone share some code?

EDIT: Where does the camera have to be for this to work?

2

I have this in my code. (only demonstration, probably unusable for you but I want to highlight the raycast) It’s a hybrid approach. For pure ECS you’d have to use the Physics package.

public static Entity GetEntityFromMouse(LayerMask mask)
    {
        Entity target = Entity.Null;
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        RaycastHit hit;
        if (Physics.Raycast(ray, out hit, 1000.0f, mask))
        {
            var go = hit.transform.gameObject;

            var comp = go.GetComponent<HybridEntity>();

            if (comp != null)
            {
                target = comp.entity;             
            }
        }

        return target;
    }

Important part is the raycast so you get a proper position where you actually clicked in 3d space. The hit.position will tell you where the cube should go.

For a pure ECS example, I think there’s a mouse raycast sample in the physics package.

1 Like
3

I appreciate the example. I actually figured it out for myself. I was just setting the Vector3.z incorrectly.

I’ll probably be able to share something cool soon.