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Flamethrower

This guide details how to configure the Flamethrower combat ability for the Bull Boss New AI entity It covers importing and trimming animations, IK layer settings, parenting particle effects, setting up continuous hitbox damage, and attaching audio sources

1. Overview & Ability Configuration

Add the Flamethrower ability to the boss's active ability entry group and adjust its probability for testing

Steps

  1. Select the Bull Boss New GameObject in the hierarchy
  2. Open the Enemy Ability System component
  3. Set the probability of other abilities (e.g., Ground Slam) to 0% to focus on testing the Flamethrower
  4. Click Add Ability Entry Group and set the ability type to Flamethrower
  5. Set Rotation Mode to Rotate Only Upper Body
  6. Set Flamethrower Probability to 100%

2. Animation Import, Trimming & Animator Setup

Download the required animation asset from Mixamo, optimize it, and bind it to the animator state

2.1 Importing & Trimming Animation

  1. Go to Mixamo, search for the Yelling clip (specifically Yelling Out), and download it for Unity
  2. Import the downloaded .FBX file into your project folder (e.g., Mixamo Animations)
  3. Select the file in the Project view and change Rig Type to Humanoid, then click Apply
  4. Open the Animation tab in the inspector:
  5. Trim the start and end of the clip so only the core roaring/yelling duration remains
  6. Set Loop Time to Checked
  7. Set Based Upon to Original and click Apply

2.2 Adding to Boss Animator

  1. Select Bull Boss New and expand the Animation Setup Tool
  2. Drag and drop the trimmed Yelling Out clip into the tool and rename it to Roar
  3. Click Add to Animator and Optimize Animation Clip
  4. (Optional) Delete the original Yelling Out FBX file
  5. Open the Animator Window:
  6. Select the Roar state node and set Speed to 0.2
  7. Select the transition from Any State -> Roar and change Transition Duration to 0.4
  8. Navigate back to the Enemy Ability System on Bull Boss New and assign Roar as the animation clip for the Flamethrower ability

Important (Upper Body Tracking): In the Animator Window, switch to the Layers tab and check the IK Pass checkbox This ensures the boss's upper body dynamically rotates to track the target while performing the ability

3. Particle Effect & Bone Placement

Attach the visual particle effect to the boss's head bone.

Steps

  1. In the Project window, search for the Flamethrower Loot particle prefab
  2. Drag Flamethrower Loot into the scene hierarchy
  3. In the hierarchy of Bull Boss New, expand the bone hierarchy:
    Bull Boss New -> Neck -> Head
  4. Drag and drop Flamethrower VFX to make it a direct child of the Head bone
  5. Adjust the local position/rotation of the particle effect to align with the head
  6. Deactivate the Flamethrower VFX GameObject by default

4. Damage Area & Hitbox Setup (Continuous Damage)

Create an area-of-effect collider to deal continuous damage to the player during the flamethrower attack

4.1 Creating the Damage Area

  1. Right-click the Flamethrower VFX GameObject -> Create Empty and name it Damage Area
  2. Add a Capsule Collider component:
  3. Set Direction / Axis to Z-Axis
  4. Scale and shape the collider to match the length and spread of the flame cone
  5. Check Is Trigger

4.2 Configuring the Continuous Hitbox

  1. Add a Hitbox component to the Damage Area GameObject
  2. Configure the properties:
  3. Damage: 1
  4. Owner: Drag and drop Bull Boss New
  5. Compare Enemy: Checked (Assign Bull Boss New)
  6. Activation Mode: Auto Activate On Start
  7. Activation Delay: 3 seconds
  8. Continuous Damage: Checked
  9. Damage Interval: 0.25 seconds (Deals 1 damage every 0.25 seconds)

5. Linking Ability Parameters

Assign the particle object and timing configuration back to the boss ability settings

Steps

  1. Select Bull Boss New in the hierarchy
  2. In the Flamethrower Ability Group, configure the following:
Parameter Recommended Value Description
Effect Assign Flamethrower VFX Particle object activated during ability
Is Particle Effect Checked Tells system to handle object as a particle
Effect Delay 1 second Delay after animation starts before activating flames
Ability Lifetime 10 seconds Total duration the flamethrower stays active
Idle Delay 1 second Delay before returning to idle after ability completes

6. Sound Setup (Optional)

Add continuous loop audio for the flames

Steps

  1. Select the Flamethrower VFX GameObject in the hierarchy
  2. Right-click -> Create Empty (or directly click Add Component) and select Audio Source
  3. Assign your flamethrower sound effect clip to the Audio Clip field
  4. Check Play On Awake
  5. Check Loop

    Since the audio source is a child of the Flamethrower VFX object, the sound automatically plays when the particle effect is enabled and stops when disabled

7. Testing & Verification Checklist

  • [ ] IK Pass: Checked in the Animator Layer settings (enables body tracking while flaming)
  • [ ] Flamethrower Object: Disabled/Deactivated in hierarchy by default
  • [ ] Continuous Hitbox: Continuous Damage box checked with proper Damage Interval
  • [ ] Targeting Behavior: When player walks behind the boss, the boss stops the ability, turns to face the player, and resumes attacking