Get Random Point On Sphere

[speedything]

Hi all,

First post and just want to say that I'm absolutely loving this add-on. I'm Design Director at my company and next year I'm going to try to roll it out to my guys to use for prototyping.

Anyway, here's an action I just had to add for my own project. It will create a random point on a fictional sphere's surface which can be stored either as a Vector3 or as XYZ floats.

Code: [Select]

using UnityEngine;
using System.Collections;

namespace HutongGames.PlayMaker.Actions
{
[ActionCategory(ActionCategory.Vector3)]
[Tooltip("Get Random Vector3 from the surface of a radius 1 Sphere")]
public class GetRandomPointOnSphere : FsmStateAction
{

[UIHint(UIHint.Variable)]
public FsmVector3 vector;

[UIHint(UIHint.Variable)]
public FsmFloat x;

[UIHint(UIHint.Variable)]
public FsmFloat y;

[UIHint(UIHint.Variable)]
public FsmFloat z;

public bool everyFrame;

public override void Reset()
{
vector = null;
x = null;
y = null;
z = null;
everyFrame = false;
}

public override void OnEnter()
{
DoGetRandomPointOnSphere();

if (!everyFrame)
Finish();
}

public override void OnUpdate()
{
DoGetRandomPointOnSphere();
}

void DoGetRandomPointOnSphere()
{
Vector3 position;

position = Random.onUnitSphere;

vector.Value = position;
x.Value = position.x;
y.Value = position.y;
z.Value = position.z;
}


}
}

It's pretty basic code that simply calls Unity's Random.onUnitSphere. Unfortunately the sphere has to be of radius 1 but you can then do stuff with the floats as a second step.

Bye,

[Alex Chouls]

Cool! Would be convenient to set a radius right in this action...

[Andrew.Lukasik]

Hi
Can you describe one or two situations in which this script comes most handy for you?

Thanks for sharing!
Andrew

[speedything]

The situation I'm using it for is to generate an asteroid belt around a sun. I get my random point, do a little multiplication on the X and Z, and then instantiate an asteroid at the location.

Most other situations I can think of also involve spawning, but I can imagine it could be used for other things. Maybe generating a random 3D movement direction or similar?

[elmoeduardo]

Started with your code and upgraded it a little.
i actually use it to set random wandering points for an enemy within a certain radius, and it also translates that point to the sphere origin. Hope it helps somebody  

Code: [Select]

using UnityEngine;
using System.Collections;

namespace HutongGames.PlayMaker.Actions
{
[ActionCategory(ActionCategory.Vector3)]
[Tooltip("Get Random Vector3 from a sphere")]
public class GetRandomPointOnSphere : FsmStateAction
{

[UIHint(UIHint.Variable)]
public FsmVector3 sphereCenter;

[UIHint(UIHint.Variable)]
public FsmFloat sphereRadius;

[UIHint(UIHint.Variable)]
public FsmVector3 storeResult;

public bool everyFrame;

public override void Reset()
{
sphereCenter = null;
sphereRadius = new FsmFloat { UseVariable = true };
storeResult = null;
everyFrame = false;
}

public override void OnEnter()
{
DoGetRandomPointOnSphere();

if (!everyFrame)
Finish();
}

public override void OnUpdate()
{
DoGetRandomPointOnSphere();
}

void DoGetRandomPointOnSphere()
{
Vector3 position;

position = Random.onUnitSphere;
position *= sphereRadius.Value;
position += sphereCenter.Value;

storeResult.Value = position;

}


}
}

[jeanfabre]

Hi,

 Used them actions to make two actions on the Ecosystem ( with advanced feature for update, fixed and lateupdate feature).

https://twitter.com/JeanAtPlayMaker/status/720155971356647425


Bye,

 Jean