Multi Screen

Hello everyone!

I want to create 360 degrees panorama in my application. For this I write code that generates several cameras, every camera looks to special direction. There is no problem how many monitors or computers I want to use to draw panorama. The problem is in the next picture I see when I'm looking down to generated cameras.





In example I generated 6 cameras and I saw that every camera didn't touch by left and right sides another cameras. So there will be "holes" between every two cameras in my panorama.

I use exact geometrical formula, why the result is not as expected ?
Angle around Y axis (I called it Alpha) is 60 degrees (FOV is equal to 48.02031).
There is a formula to convert Alpha to FOV:
tg(Alpha/2) / Screen.width == tg (FOV/2) / Screen.height


Script below generates cameras. I have also attached project to topic.

Code (csharp):

1.  
2. using UnityEngine;
3.  
4.  
5. public class MultiScreenController : MonoBehaviour
6. {
7.  
8.     public Camera LeftCamera = null;
9.     public int Number = 6;
10.     public Camera[] Cameras = null;
11.  
12.     private float angle = 60;
13.     private float timer = 3.0f;
14.     private bool exit = false;
15.  
16.     void Awake()
17.     {
18.         CreateCameras();
19.     }
20.  
21.     private void CreateCameras()
22.     {
23.         print(Screen.width + " x " + Screen.height);
24.         print(LeftCamera.aspect);
25.         print(1.0f * Screen.width / Screen.height);
26.  
27.         //float aspect = LeftCamera.aspect;
28.         float aspect = 1.0f * Screen.width / Screen.height;
29.  
30.         angle = 360.0f / Number;
31.  
32.         float fov = CalculateFOW(aspect, angle);
33.         print("FOV = " + fov);
34.         float alpha = CalculateAlpha(aspect, fov);
35.         print("ALPHA = " + alpha);
36.  
37.         Cameras = new Camera[Number];
38.         Cameras[0] = LeftCamera;
39.         Cameras[0].fov = fov;
40.         for (int i = 1; i < Number; i++)
41.         {
42.             Cameras[i] = Instantiate(LeftCamera, LeftCamera.transform.position, Quaternion.identity) as Camera;
43.             if (null == Cameras[i])
44.             {
45.                 Debug.LogError("null == Cameras[i]");
46.                 return;
47.             }
48.  
49.             Cameras[i].gameObject.name = "0" + i + "Camera";
50.             Cameras[i].transform.parent = LeftCamera.transform.parent;
51.  
52.             Cameras[i].fov = fov;
53.             Cameras[i].transform.rotation = Quaternion.Euler(0, i * angle, 0);
54.         }
55.     }
56.  
57.     private float CalculateFOW(float aspect, float alpha)
58.     {
59.         float angle = alpha * Mathf.Deg2Rad;
60.  
61.         float fovRadians = 2 * Mathf.Atan(Mathf.Tan((1.0f / aspect) * (angle / 2.0f)));
62.  
63.         float fovDegrees = fovRadians * Mathf.Rad2Deg;
64.  
65.         return fovDegrees;
66.     }
67.  
68.     private float CalculateAlpha(float aspect, float fov)
69.     {
70.         float fovRadians = fov * Mathf.Deg2Rad;
71.  
72.         float alphaRadians = 2 * Mathf.Atan(Mathf.Tan(aspect * (fovRadians / 2.0f)));
73.  
74.         float alphaDegrees = alphaRadians * Mathf.Rad2Deg;
75.  
76.         return alphaDegrees;
77.     }
78. }
79.  

 

The correct formula for calculating the camera's field of view (vertical) from the horizontal field of view is:-

Code (csharp):

1. camera.fieldOfView = 2f * Mathf.Rad2Deg * Mathf.Atan(Mathf.Tan(.5f * Mathf.Deg2Rad * horizFOV) / camera.aspect);

 

Thank you for quick answer !

I did a mistake then I was transforming my formula.

Your formula is actually correct.