Screen Coordinates of an object's corners

Question

I'm wondering how to tell where the furthest left and "top" screen coordinates of an object is.

I had thought to use the transform.collider.min and doing worldtoscreenpoint, but as the camera rotates around the object (especially around the x axis) this doesn't always hold up.

Thanks!

Answer 1

Best Answer

Answer by Jaap Kreijkamp · Jun 20, 2010 at 07:18 AM

I'm afraid there's no easy solution for this. You could go over all the points of your collider, calculate screencoords and calculate min/max values on them.

1 Show 1 · Share

Adamv · Jun 20, 2010 at 04:55 PM 0

Share

Yeah, that sounds painful. If it can't be done, it can't be done though. Maybe I'll add a comment about this in the GUI thread at feedback.unity3d.com.

Answer 2

Answer by Auberhine · Sep 27, 2010 at 02:39 PM

If you still havent found an easier solution for this, here is my complicated and not very accurate solution.

This is the function you need for getting an objects PIXEL SIZE (size drawn on screen)

    //Gives pixel size of an object
    public static float angularSize (float diam, float dist, Camera cam) {
        float aSize = (diam / dist) * Mathf.Rad2Deg;
        float pSize = ((aSize * Scr.height) / cam.fieldOfView);
            return pSize;
    }

Where diam is, diam = transform.collider.bounds.extents.magnitude; dist is, dist = Vector3.Distance (transform.position, Camera.main.transform.position); cam is the camera you are using.

This works for square or circular objects best. Then you can work your way through objects screen position and the objects screen size to find your answer.

Regards,

Aubergine

0 · Share

Screen Coordinates of an object's corners

2 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions