Add a continuous force to the rigidbody, using its mass.
Apply the force in each FixedUpdate over a duration of time. This mode depends on the mass of rigidbody so more force must be applied to push or twist higher-mass objects the same amount as lower-mass objects. This mode is useful for setting up realistic physics where it takes more force to move heavier objects. In this mode, the unit of the force parameter is applied to the rigidbody as mass*distance/time^2.
using UnityEngine;
public class Example : MonoBehaviour { //Use to switch between Force Modes enum ModeSwitching { Start, Impulse, Acceleration, Force, VelocityChange }; ModeSwitching m_ModeSwitching;
Vector3 m_StartPos, m_StartForce; Vector3 m_NewForce; Rigidbody m_Rigidbody;
string m_ForceXString, m_ForceYString; float m_ForceX, m_ForceY; float m_Result;
void Start() { //You get the Rigidbody component you attach to the GameObject m_Rigidbody = GetComponent<Rigidbody>(); //This starts at first mode (nothing happening yet) m_ModeSwitching = ModeSwitching.Start; //Initialising the force which is used on GameObject in various ways m_NewForce = new Vector3(-5.0f, 1.0f, 0.0f); //Initialising floats m_ForceX = 0; m_ForceY = 0;
//The forces typed in from the text fields (the ones you can manipulate in Game view) m_ForceXString = "0"; m_ForceYString = "0";
//The GameObject's starting position and Rigidbody position m_StartPos = transform.position; m_StartForce = m_Rigidbody.transform.position; }
void Update() { //If the current mode is not the starting mode (or the GameObject is not reset), the force can change if (m_ModeSwitching != ModeSwitching.Start) { //The force changes depending what you input into the text fields m_NewForce = new Vector3(m_ForceX, m_ForceY, 0); }
//Here, switching modes depend on button presses in the Game mode switch (m_ModeSwitching) { //This is the starting mode which resets the GameObject case ModeSwitching.Start: //This resets the GameObject and Rigidbody to their starting positions transform.position = m_StartPos; m_Rigidbody.transform.position = m_StartForce; //This resets the velocity of the Rigidbody m_Rigidbody.velocity = new Vector3(0f, 0f, 0f); break;
//These are the modes ForceMode can force on a Rigidbody //This is Acceleration mode case ModeSwitching.Acceleration: //The function converts the text fields into floats and updates the Rigidbody’s force MakeCustomForce(); //Use Acceleration as the force on the Rigidbody m_Rigidbody.AddForce(m_NewForce, ForceMode.Acceleration); break;
//This is Force Mode, using a continuous force on the Rigidbody considering its mass case ModeSwitching.Force: //Converts the text fields into floats and updates the force applied to the Rigidbody MakeCustomForce(); //Use Force as the force on GameObject’s Rigidbody m_Rigidbody.AddForce(m_NewForce, ForceMode.Force); break;
//This is Impulse Mode, which involves using the Rigidbody’s mass to apply an instant impulse force. case ModeSwitching.Impulse: //The function converts the text fields into floats and updates the force applied to the Rigidbody MakeCustomForce(); //Use Impulse as the force on GameObject m_Rigidbody.AddForce(m_NewForce, ForceMode.Impulse); break;
//This is VelocityChange which involves ignoring the mass of the GameObject and impacting it with a sudden speed change in a direction case ModeSwitching.VelocityChange: //Converts the text fields into floats and updates the force applied to the Rigidbody MakeCustomForce(); //Make a Velocity change on the Rigidbody m_Rigidbody.AddForce(m_NewForce, ForceMode.VelocityChange); break; } }
//The function outputs buttons, text fields, and other interactable UI elements to the Scene in Game view void OnGUI() { //Getting the inputs from each text field and storing them as strings m_ForceXString = GUI.TextField(new Rect(300, 10, 200, 20), m_ForceXString, 25); m_ForceYString = GUI.TextField(new Rect(300, 30, 200, 20), m_ForceYString, 25);
//Press the button to reset the GameObject and Rigidbody if (GUI.Button(new Rect(100, 0, 150, 30), "Reset")) { //This switches to the start/reset case m_ModeSwitching = ModeSwitching.Start; }
//When you press the Acceleration button, switch to Acceleration mode if (GUI.Button(new Rect(100, 30, 150, 30), "Apply Acceleration")) { //Switch to Acceleration (apply acceleration force to GameObject) m_ModeSwitching = ModeSwitching.Acceleration; }
//If you press the Impulse button if (GUI.Button(new Rect(100, 60, 150, 30), "Apply Impulse")) { //Switch to impulse (apply impulse forces to GameObject) m_ModeSwitching = ModeSwitching.Impulse; }
//If you press the Force Button, switch to Force state if (GUI.Button(new Rect(100, 90, 150, 30), "Apply Force")) { //Switch to Force (apply force to GameObject) m_ModeSwitching = ModeSwitching.Force; }
//Press the button to switch to VelocityChange state if (GUI.Button(new Rect(100, 120, 150, 30), "Apply Velocity Change")) { //Switch to velocity changing m_ModeSwitching = ModeSwitching.VelocityChange; } }
//Changing strings to floats for the forces float ConvertToFloat(string Name) { float.TryParse(Name, out m_Result); return m_Result; }
//Set the converted float from the text fields as the forces to apply to the Rigidbody void MakeCustomForce() { //This converts the strings to floats m_ForceX = ConvertToFloat(m_ForceXString); m_ForceY = ConvertToFloat(m_ForceYString); } }