A camera follow script with numerous parameters for Unity

CameraFollow.cs

using UnityEngine;

[ExecuteInEditMode]
public class CameraFollow : MonoBehaviour
{
	[Tooltip( "Object to follow" )]
	public Transform Target;

	[Tooltip( "Target distance to the followed object" )]
	public Vector3 DistanceToTarget = new Vector3( 0f, 3f, -5f );

	[Tooltip( "Adds an offset to the camera's focus point" )]
	public Vector3 LookAtOffset = new Vector3( 0f, 0f, 0f );

	[Range( 0f, 1f )]
	[Tooltip( "0.0: Camera will look in the forward direction of the Target\n" +
			  "1.0: Camera will look at the Target (With LookAtOffset applied)" )]
	public float LookAtTargetModifier = 1f;

	[Tooltip( "Lerp modifier for camera's position" )]
	public float MovementSpeed = 10f;

	[Tooltip( "Lerp modifier for camera's rotation" )]
	public float RotationSpeed = 10f;

#if UNITY_EDITOR
	[Tooltip( "Camera follows the target while not in Play mode, too" )]
	public bool ExecuteInEditMode = false;
#endif

	// If the character is moving with physics inside FixedUpdate, then this function should also be changed to FixedUpdate
	private void LateUpdate()
	{
#if UNITY_EDITOR
		if( !UnityEditor.EditorApplication.isPlaying && !ExecuteInEditMode )
			return;
#endif

		if( !Target )
			return;

		// Calculate camera's new position
		Vector3 targetPosition = Target.position;
		Vector3 cameraPosition = targetPosition + new Vector3( 0f, DistanceToTarget.y, 0f );
		Vector3 focusPointOffset = new Vector3( 0f, LookAtOffset.y, 0f );

		Vector3 targetForward = Target.forward;
		targetForward.y = 0f;
		targetForward.Normalize();

		cameraPosition += targetForward * DistanceToTarget.z;
		focusPointOffset += targetForward * LookAtOffset.z;

		if( DistanceToTarget.x != 0f || LookAtOffset.x != 0f )
		{
			Vector3 targetRight = Target.right;
			targetRight.y = 0f;
			targetRight.Normalize();

			cameraPosition += targetRight * DistanceToTarget.x;
			focusPointOffset += targetRight * LookAtOffset.x;
		}

		// Lerp camera's position to the target position
		Vector3 newPosition = Vector3.Lerp( transform.position, cameraPosition, Time.deltaTime * MovementSpeed );
		transform.position = newPosition;

		// Lerp camera's rotation to the target rotation
		Quaternion cameraRotation;
		if( LookAtTargetModifier <= 0f )
			cameraRotation = Quaternion.LookRotation( targetForward );
		else
		{
			Vector3 lookAtDirection = targetPosition + focusPointOffset - newPosition;

			if( LookAtTargetModifier >= 1f )
				cameraRotation = Quaternion.LookRotation( lookAtDirection );
			else
				cameraRotation = Quaternion.LerpUnclamped( Quaternion.LookRotation( targetForward ), Quaternion.LookRotation( lookAtDirection ), LookAtTargetModifier );
		}

		transform.rotation = Quaternion.Lerp( transform.rotation, cameraRotation, Time.deltaTime * RotationSpeed );

#if UNITY_EDITOR
		if( !UnityEditor.EditorApplication.isPlaying && ExecuteInEditMode )
		{
			transform.position = cameraPosition;
			transform.rotation = cameraRotation;
		}
#endif
	}
}