Emotion-Based Animation System

One line sets movement speed, animator triggers, and blink rate automatically.

Overview

Before:
  anim.Play("Idle");

NPC Mentality:
  emotion.Set(Emotion.Angry);
  → Auto: walk speed increase / head shake / expression change / blink decrease

Component

EmotionController — MonoBehaviour.

Field	Type	Description
Animator	Animator	NPC animator
Agent	NavMeshAgent	Movement speed control (optional)
CurrentEmotion	EmotionType	Current emotion (read-only)

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EmotionType Enum

public enum EmotionType
{
    Neutral,
    Happy,
    Angry,
    Sad,
    Afraid,
    Surprised,
    Disgusted
}

---

API

Set

void Set(EmotionType emotion)

Sets the emotion and applies effects immediately.

emotion.Set(EmotionType.Angry);
emotion.Set(EmotionType.Happy);
emotion.Set(EmotionType.Neutral); // Reset

---

Effects by Emotion

Emotion	NavMesh Speed	Animator Trigger	BlinkRate
Neutral	×1.0 (default)	"Idle"	1.0
Happy	×1.0	"Happy"	1.0
Angry	×1.5	"Angry"	0.3 (decreased)
Sad	×0.7	"Sad"	0.8
Afraid	×1.3	"Afraid"	1.5 (increased)

Animator Parameters: BlinkRate (Float), and a Trigger parameter for each emotion.

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Animator Setup

Parameters:
  BlinkRate   [Float]    — Connect to blink speed Blend Tree
  Idle        [Trigger]
  Happy       [Trigger]
  Angry       [Trigger]
  Sad         [Trigger]
  Afraid      [Trigger]

---

Example

using NpcMentality;

public class NPCReaction : MonoBehaviour
{
    private NPCMemory _memory;
    private EmotionController _emotion;

    private void Awake()
    {
        _memory  = GetComponent<NPCMemory>();
        _emotion = GetComponent<EmotionController>();
    }

    public void OnTalkWithPlayer()
    {
        float attitude = _memory.GetAttitude();

        if (attitude < -8f)
            _emotion.Set(EmotionType.Angry);
        else if (attitude < -2f)
            _emotion.Set(EmotionType.Disgusted);
        else if (attitude > 8f)
            _emotion.Set(EmotionType.Happy);
        else
            _emotion.Set(EmotionType.Neutral);
    }

    public void OnCombatStart() => _emotion.Set(EmotionType.Afraid);
    public void OnCombatEnd()   => _emotion.Set(EmotionType.Neutral);
}