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Question by Rizzutp · Jan 29, 2020 at 11:52 AM · cameraboundsboundingbox

Reporting the vertices of a 3D Bounding Box to Screen position

Hello there, I wrote the following method for having the 8 vertices of a 3D bounding box. I need to have those vertices reported with respect to the screen. Here it is my solution:

     public Vector3[] BuildBoundingBox3D(GameObject o, Camera cam)
     {
         Renderer[] rends = o.GetComponentsInChildren<Renderer>();
         Bounds bounds = rends[0].bounds;
 
         foreach (Renderer rend in rends)
         {
             bounds = bounds.GrowBounds(rend.bounds);
         }
 
         Vector3[] results = new Vector3[8];
         results[0] = new Vector3(bounds.min.x, bounds.min.y, bounds.min.z);
         results[1] = new Vector3(bounds.max.x, bounds.min.y, bounds.min.z);
         results[2] = new Vector3(bounds.max.x, bounds.max.y, bounds.min.z);
         results[3] = new Vector3(bounds.min.x, bounds.max.y, bounds.min.z);
         results[4] = new Vector3(bounds.min.x, bounds.min.y, bounds.max.z);
         results[5] = new Vector3(bounds.max.x, bounds.min.y, bounds.max.z);
         results[6] = new Vector3(bounds.max.x, bounds.max.y, bounds.max.z);
         results[7] = new Vector3(bounds.min.x, bounds.max.y, bounds.max.z);
 
         for (int i = 0; i < results.Length; i++)
         {
             results[i] = cam.WorldToScreenPoint(results[i]);
             results[i].y = Screen.height - results[i].y;
         }

         return results;
     }

I don't know if this is correct, or if there exists a better way to obtain the BB vertices w.r.t. the screen

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