Information exchange between Unity and Rain

[JaroslavParticipant]

Hello all!

I’ve been wondering for days now, how to exchange information between Unity and Rain. For example, when you have FPS shooter and you cast a Raycast via unity script, you hit the enemy and then play death animation. But in behaviour tree the enemy is still moving because I didn’t know how to send message from unity script to rain script informing the rain, that enemy is dead. Today i found out, that by writing custom extension and adding it to the AI I can manipulate working memory and change decisions in behavior tree.

Now my question is, how to access working memory from outside RAIN (in Unity).
For example:

// cast a ray from gun
if (Physics.Raycast (ray, out hit))
{  
    // code for parent omitted
    // if object is not an environment or dead enemy
    if (parent.tag != "Environment" && hit.collider.gameObject.tag != "Dead")
    {
        // get animator
        Animator animator = (Animator) hit.collider.gameObject.GetComponent(typeof(Animator));
	if (animator != null)
	{
            // play death enimation
            animator.SetBool("Dead", true);
            // CODE TO IMPLEMENT:
            // inform RAIN memory that target is dead so change behavior
	}
    }
}

I’ve seen http://rivaltheory.com/forums/topic/custom-code-to-change-int-value-in-memory/, but I’m not sure I got it.

Thank you!

EDIT:

I think I found it here: http://rivaltheory.com/forums/topic/integrating-with-scripts/

• This topic was modified 3 months, 2 weeks ago by  Jaroslav.
• This topic was modified 3 months, 2 weeks ago by  Jaroslav.

[MolochParticipant]

You should create a variable in the AIRig memory and set it using:
AIRig rig = GetComponentInChildren<AIRig>();
rig.AI.WorkingMemory.SetItem<T>(string name, <T> value);
In this case an isDead bool would be appropriate.

Then in the enemy behaviour tree, have a component that checks if the condition is false - behave normaly as an enemy does, but if the bool is true - animate death. Set the animation through the behaviour tree, it is preferable.

I am really new to RAIN, so pardon me if I say anaything wrong, but I am using this in my BT and it is working.
Hope this helps and ask away. We beginner are in this together.

[JaroslavParticipant]

You should create a variable in the AIRig memory and set it using:
AIRig rig = GetComponentInChildren<AIRig>();
rig.AI.WorkingMemory.SetItem<T>(string name, <T> value);
In this case an isDead bool would be appropriate.

Then in the enemy behaviour tree, have a component that checks if the condition is false – behave normaly as an enemy does, but if the bool is true – animate death. Set the animation through the behaviour tree, it is preferable.

I am really new to RAIN, so pardon me if I say anaything wrong, but I am using this in my BT and it is working.
Hope this helps and ask away. We beginner are in this together.

Yep, It’s working Thanks for the point about setting the animation through BT, I absolutely forgot about that!

[primeKeymaster]

Good response from @Moloch.

One of the techniques we often use is to create a Custom Element in RAIN for managing the interface between game code and AI code. If you’re interested, there are a bunch of great examples here:

https://www.assetstore.unity3d.com/en/#!/content/23526

Custom Elements are very easy to create. Here’s a template. You can add variables that are exposed through the RAIN editor, plus you can add code at various steps in the AI processing (AIInit, BodyInit, Start, Pre, Think, Act, Post).

using UnityEngine;
using System.Collections;
using RAIN.Core;
using RAIN.Serialization;
[RAINSerializableClass, RAINElement("Your element name here")]
public class YourCustomElementClass : CustomAIElement 
{
    [RAINSerializableField(Visibility = FieldVisibility.Show, ToolTip = "Your tooltip")]
    private _someVisibleVariable;
    public override void Act()
    {
        base.Act();
        //Add some custom code here
    }
}

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