If() (NPC has available dialogue)

[nathanj]

Hi Tony

I would like to set up my NPCs so that if they have an available dialogue (trying to think of a better way to describe this, if a node is available) they activate an IK script I have attached to the NPC - the script is a basic IK "Look At" script that is triggered through a bool.

I would like it that if a given NPC has available dialogue they look at the player, but if they do not have any available dialogue they do not look at the NPC.

You mind pointing me in where I would find this in the documentation?

Thanks again,
Nathan

[Tony Li]

Hi Nathan,

It'll require a little scripting or PlayMaker-ing.

The function DialogueManager.ConversationHasValidEntry() will tell you whether any nodes linked from the START node in a conversation are currently valid.

The PlayMaker support package has an equivalent Does Conversation Have Valid Entries action.

Here's an example scene: LookIfHasConversation_2018-05-21.unitypackage

Since the example NPC doesn't have IK, it just rotates the NPC to face the player.

The example uses this script:

Spoiler

Code: Select all

using UnityEngine;
using System.Collections;
using PixelCrushers.DialogueSystem;

[RequireComponent(typeof(ConversationTrigger))]
public class LookIfHasConversation : MonoBehaviour
{

    IEnumerator Start()
    {
        var conversationTrigger = GetComponent<ConversationTrigger>();
        var player = GameObject.FindGameObjectWithTag("Player").transform;
        var oneSecond = new WaitForSeconds(1);
        while (true)
        {
            if (DialogueManager.ConversationHasValidEntry(conversationTrigger.conversation))
            {
                transform.LookAt(player);
            }
            yield return oneSecond;
        }
    }
}

[nathanj]

Totally worked!

Thanks again

Nathan

[nathanj]

One thing, incase anyone else tries this.

I was getting this error initially:

Dialogue System: Lua code 'return CurrentQuestState("CuttingStoneMarker") ~= "success"' threw exception 'Tried to invoke a function call on a non-function value. If you're calling a function, is it registered with Lua?'
UnityEngine.Debug:LogError(Object)
PixelCrushers.DialogueSystem.Lua:RunRaw(String, Boolean, Boolean)
PixelCrushers.DialogueSystem.Lua:Run(String, Boolean, Boolean)
PixelCrushers.DialogueSystem.Lua:IsTrue(String, Boolean, Boolean)
PixelCrushers.DialogueSystem.ConversationModel:EvaluateLinksAtPriority(ConditionPriority, DialogueEntry, List`1, List`1, List`1, Boolean)
PixelCrushers.DialogueSystem.ConversationModel:EvaluateLinksAtPriority(ConditionPriority, DialogueEntry, List`1, List`1, List`1, Boolean)
PixelCrushers.DialogueSystem.ConversationModel:EvaluateLinks(DialogueEntry, List`1, List`1, List`1, Boolean)
PixelCrushers.DialogueSystem.ConversationModel:GetState(DialogueEntry, Boolean, Boolean, Boolean)
PixelCrushers.DialogueSystem.ConversationModel:.ctor(DialogueDatabase, String, Transform, Transform, Boolean, IsDialogueEntryValidDelegate, Int32, Boolean, Boolean)
PixelCrushers.DialogueSystem.DialogueSystemController:ConversationHasValidEntry(String, Transform, Transform)
PixelCrushers.DialogueSystem.DialogueManager:ConversationHasValidEntry(String)
<Start>c__Iterator0:MoveNext() (at Assets/Dialogue System Examples/Look If Has Conversation Example/LookIfHasConversation.cs:21)
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

what was happening is the NPCs were being enabled before the database was, and so their searches were turning out null.

The simple fix is to move the yield return new WaitForSeconds(); above, like:

Code: Select all

while (true)
        {
           yield return oneSecond;
            if (DialogueManager.ConversationHasValidEntry(conversationTrigger.conversation))
            {
                transform.LookAt(player);
            }
            
        }

Nathan

[Tony Li]

Good catch!