koobas.hobune.stream
Displaying velocity of a game object
Hi, I am working on to get a game object's velocity. I got stock on displaying the values
using UnityEngine;
using System.Collections;
public class UnitDisplayScript : MonoBehaviour {
void FixedUpdated()
{
speed = GameObject.rigidbody.velocity.magnitude;
}
void OnGUI()
{
GUI.Box(new Rect(10,10,100,90), "Measurements");
GUI.Label(new Rect(20,40,80,20), speed + "m/s");
}
}
GUI does appear on the left top corner of the display. Just that velocity does not change...
If it does display will it be resultant velocity? Also, how would I display vertical and horizontal velocity?
im trying to do the same but it will only display 0. any ideas?
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class yeet : $$anonymous$$onoBehaviour {
private float speed;
void FixedUpdated()
{
speed = GetComponent<Rigidbody>().velocity.magnitude;
}
void OnGUI()
{
GUI.Box(new Rect(10, 10, 100, 90), "$$anonymous$$easurements");
GUI.Label(new Rect(20, 40, 80, 20), "velocity is:" + speed );
}
}
Please don't post questions as answers - it looks like your problem is that you copied the FixedUpdated typo... This should be changed to FixedUpdate else Unity won't call it and speed will remain zero.
GameObject is the class where all the objects inherit from, in order to access the specific gameObject, write it with a non-capital letter. Change
GameObject.rigidbody.velocity.magnitude
to one of those alternatives
gameObject.rigidbody.velocity.magnitude
rigidbody.velocity.magnitude
GetComponent<Rigidbody>().velocity.magnitude
Note that rigidbody and GetComponent< Rigidbody>() are identical, so you better cache the rigidbody parameter in the Start Function and use that one (_rigidbody) all the time:
private Rigidbody _rigidbody;
private void Start()
{
_rigidbody = rigidbody;
}
This may be micro optimizing, but as you plan to call this every frame it's worth a thought.
I am getting an error: "The name 'speed' does not exist in the current context"
using UnityEngine;
using System.Collections;
public class UnitDisplayScript : $$anonymous$$onoBehaviour {
void FixedUpdated()
{
speed = rigidbody.velocity.magnitude;
}
void OnGUI()
{
GUI.Box(new Rect(10,10,100,90), "$$anonymous$$easurements");
GUI.Label(new Rect(20,40,80,20), speed + "m/s");
}
}
What have I done wrong?
You have to declare the variable globally first and put it in line 5:
private float speed;
And like merry_christmas correctly noted the function should be called FixedUpdate() and not FixedUpdated(), otherwise it's not going to be called.
