My first sucessful script! (Planet Gravity...)

I just recently found unity and have been trying to use it to create planet gravity (like you can find in Super Mario Galaxy)and I have finally suceeded. the script is below (NOTE: must have a rigidbody inside the object):

Code (csharp):

1.  
2. var planet : GameObject;
3. var gravity = 2;
4. function Update(){
5. rigidbody.velocity.x = ((-transform.position.x + planet.transform.position.x)*gravity);
6. rigidbody.velocity.y = ((-transform.position.y + planet.transform.position.y)*gravity);
7. rigidbody.velocity.z = ((-transform.position.z + planet.transform.position.z)*gravity);
8. transform.LookAt(planet.transform.position);
9. }

sorry, I had to access each vector individually to make it work. change the value gravity to determine the power of the gravity. also, define the planet by changing the planet gameobject.[/code]

 

All of your physics/rigidbody code should be under FixedUpdate() instead of Update().

 

ok. I'll fix that.

 

ok. Here's the new code:

Code (csharp):

1.  
2. var planet : GameObject;
3. var gravity = 2;
4. function FixedUpdate(){
5. rigidbody.velocity.x = ((-transform.position.x + planet.transform.position.x)*gravity);
6. rigidbody.velocity.y = ((-transform.position.y + planet.transform.position.y)*gravity);
7. rigidbody.velocity.z = ((-transform.position.z + planet.transform.position.z)*gravity);
8. transform.LookAt(planet.transform.position);
9. }
10.  

anyone have a comment on it?

 

any comments? suggestions? Ideas?

 

isn't this the same as your x, y, z ?


rigidbody.velocity = (-transform.position + planet.transform.position) * gravity ;

transform.LookAt(planet.transform.position);

 

It's Javascript.

--Eric

 

I did a cut&paste; it compiles fine with no errors.

--Eric

 

Ok. A couple of things just to clear it up... It's in JavaScript, it needs to have an object assigned to it, and it needs to have a non-kinematic(is that spelled right?) rigidbody that doesn't use gravity to function correctly. Also, I tried the assigning the whole velocity but it wouldn't work unless I assigned them individually.

 

Oh, if the first person script applies gravity itself this won't work at all.

 

Wox I tried it and it does work well with that segment, as far as I can tell the exact same

 

I have changed this to be based on distance from the object is there a better way to do it?


var planet : GameObject;
var gravity = 2;
function FixedUpdate(){
rigidbody.velocity = ((-transform.position + planet.transform.position) * gravity)/ (Mathf.Abs(-transform.position.x + planet.transform.position.x) + Mathf.Abs(-transform.position.y + planet.transform.position.y) + Mathf.Abs(-transform.position.z + planet.transform.position.z)) ;
transform.LookAt(planet.transform.position);
}

 

Hello , i have one problem, i want to make the gravity 0.2 but i cannot put a point in the variable? how do i fix this!

 

You have to explicitily specify the type of variable. You want a float, but without specifying it the compiler thinks you mean an int.

So change this:

var gravity = 2;

to this:

var gravity : float = 2.0;

 

Exactly how do I set this up? I made a sphere with a third person controller prefab to test it. I put this script on the sphere, added a rigid body with no gravity and non kinematic and its not working. I dont understand what to do now.

 

If you are using the chracter controller component, a rigidbody will not have any effect, you can't reliably combine the two. The posted script is for rigidbodies only

 

I did not understand what you want to do anyway to make it less fast-falling you could work on the drag rigidbody

 

how do you assing it ?

 

http://forum.unity3d.com/threads/39618-My-first-sucessful-script!-(Planet-Gravity-)

http://answers.unity3d.com/questions/359759/how-to-program-gravity-for-planets.html

http://www.gamasutra.com/view/feature/3593/games_demystified_super_mario_.php

 

thanks guys this helped alot