透视相机模式

下面展示一些 内联代码片。

/// <summary>
        /// 获取摄像机的视口区域(透视相机模式)
        /// </summary>
        /// <param name="distance">距离相机的距离</param>
        /// <returns></returns>
        public static Vector3[] GetCorners(Camera _camera,float distance)
        {
            Vector3[] corners = new Vector3[ 4 ];
            float halfFOV = ( _camera.fieldOfView * 0.5f ) * Mathf.Deg2Rad;
            float aspect = _camera.aspect;
			
            float height = distance * Mathf.Tan( halfFOV );
            float width = height * aspect;
            Transform cameraTransform = _camera.transform;
            var position = cameraTransform.position;
            var right = cameraTransform.right;
            var up = cameraTransform.up;
            var forward = cameraTransform.forward;
             // UpperLeft
            corners[ 0 ] = position - ( right * width );
            corners[ 0 ] += up * height;
            corners[ 0 ] += forward * distance;
			
            // UpperRight
            corners[ 1 ] = position + ( right * width );
            corners[ 1 ] += up * height;
            corners[ 1 ] += forward * distance;
            // LowerLeft
            corners[ 2 ] = position - ( right * width );
            corners[ 2 ] -= up * height;
            corners[ 2 ] += forward * distance;
			
            // LowerRight
            corners[ 3 ] = position + ( right * width );
            corners[ 3 ] -= up * height;
            corners[ 3 ] += forward * distance;
                 return corners;
            
        }