Camera Control
Tutorial
Intermediate
30 Mins
Overview
Overview
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1.
Tanks Camera Control
Summary
Part 3 of the Unity Tanks project teaches you how to create a Camera which pans and zooms to keep all tanks onscreen at once.
Language
English
Recommended Unity Versions
5.2
Tutorial Materials
Tutorial
Camera Control
1.
Tanks Camera Control
Phase 3 teaches you how to create a Camera which pans and zooms to keep all tanks onscreen at once.

CameraControl Script

using UnityEngine; public class CameraControl : MonoBehaviour { public float m_DampTime = 0.2f; // Approximate time for the camera to refocus. public float m_ScreenEdgeBuffer = 4f; // Space between the top/bottom most target and the screen edge. public float m_MinSize = 6.5f; // The smallest orthographic size the camera can be. [HideInInspector] public Transform[] m_Targets; // All the targets the camera needs to encompass. private Camera m_Camera; // Used for referencing the camera. private float m_ZoomSpeed; // Reference speed for the smooth damping of the orthographic size. private Vector3 m_MoveVelocity; // Reference velocity for the smooth damping of the position. private Vector3 m_DesiredPosition; // The position the camera is moving towards. private void Awake () { m_Camera = GetComponentInChildren<Camera> (); } private void FixedUpdate () { // Move the camera towards a desired position. Move (); // Change the size of the camera based. Zoom (); } private void Move () { // Find the average position of the targets. FindAveragePosition (); // Smoothly transition to that position. transform.position = Vector3.SmoothDamp(transform.position, m_DesiredPosition, ref m_MoveVelocity, m_DampTime); } private void FindAveragePosition () { Vector3 averagePos = new Vector3 (); int numTargets = 0; // Go through all the targets and add their positions together. for (int i = 0; i < m_Targets.Length; i++) { // If the target isn't active, go on to the next one. if (!m_Targets[i].gameObject.activeSelf) continue; // Add to the average and increment the number of targets in the average. averagePos += m_Targets[i].position; numTargets++; } // If there are targets divide the sum of the positions by the number of them to find the average. if (numTargets > 0) averagePos /= numTargets; // Keep the same y value. averagePos.y = transform.position.y; // The desired position is the average position; m_DesiredPosition = averagePos; } private void Zoom () { // Find the required size based on the desired position and smoothly transition to that size. float requiredSize = FindRequiredSize(); m_Camera.orthographicSize = Mathf.SmoothDamp (m_Camera.orthographicSize, requiredSize, ref m_ZoomSpeed, m_DampTime); } private float FindRequiredSize () { // Find the position the camera rig is moving towards in its local space. Vector3 desiredLocalPos = transform.InverseTransformPoint(m_DesiredPosition); // Start the camera's size calculation at zero. float size = 0f; // Go through all the targets... for (int i = 0; i < m_Targets.Length; i++) { // ... and if they aren't active continue on to the next target. if (!m_Targets[i].gameObject.activeSelf) continue; // Otherwise, find the position of the target in the camera's local space. Vector3 targetLocalPos = transform.InverseTransformPoint(m_Targets[i].position); // Find the position of the target from the desired position of the camera's local space. Vector3 desiredPosToTarget = targetLocalPos - desiredLocalPos; // Choose the largest out of the current size and the distance of the tank 'up' or 'down' from the camera. size = Mathf.Max(size, Mathf.Abs(desiredPosToTarget.y)); // Choose the largest out of the current size and the calculated size based on the tank being to the left or right of the camera. size = Mathf.Max(size, Mathf.Abs(desiredPosToTarget.x) / m_Camera.aspect); } // Add the edge buffer to the size. size += m_ScreenEdgeBuffer; // Make sure the camera's size isn't below the minimum. size = Mathf.Max (size, m_MinSize); return size; } public void SetStartPositionAndSize () { // Find the desired position. FindAveragePosition (); // Set the camera's position to the desired position without damping. transform.position = m_DesiredPosition; // Find and set the required size of the camera. m_Camera.orthographicSize = FindRequiredSize (); } }