Unity Camera

获取摄像机视图窗口区域： camera.ViewportToWorldPoint (new Vector3 (0, 1, 10.0f))　　

void OnDrawGizmosSelected(){
        print (camera.ViewportToWorldPoint (new Vector3 (0, 1, camera.farClipPlane)));
        Vector3 p = camera.ViewportToWorldPoint (new Vector3 (0, 0, camera.farClipPlane));
        Gizmos.color = Color.yellow;
        Gizmos.DrawSphere (p, 1f);
    }

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