Understanding Velocity Acceleration Force

Downloads:

For Buildbox you can download bbasset file, drag and drop it in your projects world window. A "VAF Nodes v_1.0" object will be added to your asset list, you can go inside node-editor and copy over the node you what to use. To copy select the node you copying, and press "Command+C" (Mac) or "Ctrl+C" (Windows). Go to your asset and past by pressing "Command+V" (Mac) or "Ctrl+V" (Windows)

Velocity

Buildbox 3 script:

Required: Vector3D "Velocity" attribute and 1 input

let _velocity;
let _physics;


function init(){
    _velocity = this.attribute('Velocity');
    _physics = this.entity().physics();
}

function signal(name, value){
    if(value){
        let vel = _physics.linearVelocity();
        if(_velocity.x != null){
            vel.x = _velocity.x;
        }
        if(_velocity.y != null){
            vel.y = _velocity.y;
        }
        if(_velocity.z != null){
            vel.z = _velocity.z;
        }
        _physics.setLinearVelocity( vel.x, vel.y, vel.z );
    }
}                     
                  

Unity code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Velocity : MonoBehaviour
{
    private Rigidbody2D r2d;
    public Vector2 velocity;

    void Start()
    {
        r2d = GetComponent();
        r2d.velocity = velocity;
    }
}
                                       
                    

Acceleration

Buildbox 3 script:

Required: Vector3D "Acceleration" attribute and 1 input

let _acceleration;
let _physics;
let _go = false;


function init(){
    _acceleration = this.attribute('Acceleration');
    _physics = this.entity().physics();
}

function update(dt){
    if(_go){
        let vel = _physics.linearVelocity();
        if(_acceleration.x != null){
            vel.x += _acceleration.x*dt;
        }
        if(_acceleration.y != null){
            vel.y += _acceleration.y*dt;
        }
        if(_acceleration.z != null){
            vel.z += _acceleration.z*dt;
        }
        _physics.setLinearVelocity( vel.x, vel.y, vel.z );
    }
}


function signal(name, value){
  _go=value;
}                    
                  

Unity code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Acceleration : MonoBehaviour
{
    private Rigidbody2D r2d;
    public Vector2 acceleration;

    void Start()
    {
        r2d = GetComponent();
    }

    void FixedUpdate()
    {
        r2d.AddForce(acceleration * r2d.mass);
    }
}
                      
                                       
                    

Force

Buildbox 3 script:

Required: Vector3D "Force" attribute and 1 input

let _force;
let _physics;
let _go = false;


function init(){
    _force = this.attribute('Force');
    _physics = this.entity().physics();
}

function update(dt){
    if(_go){
        let vel = _physics.linearVelocity();
        let mass = _physics.mass();
        if(_force.x != null){
            vel.x += _force.x*dt/mass;
        }
        if(_force.y != null){
            vel.y += _force.y*dt/mass;
        }
        if(_force.z != null){
            vel.z += _force.z*dt/mass;
        }
        _physics.setLinearVelocity( vel.x, vel.y, vel.z );
    }
}


function signal(name, value){
  _go=value;
}
  
                      
                  

Unity code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Force : MonoBehaviour
{
    private Rigidbody2D r2d;
    public Vector2 force;

    void Start()
    {
        r2d = GetComponent();
    }

    void FixedUpdate()
    {
        r2d.AddForce(force);
    }
}