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3D sound

Learn 3D sound and distance falloff with Spatial Blend.

3D audio and Spatial Blend

The Spatial Blend property on an AudioSource controls whether audio behaves as 2D or 3D. At 0.0, audio is purely 2D; it sounds equally loud in both stereo ears irrespective of world distance.

AudioSource source = GetComponent<AudioSource>();
// Converting audio into fully spatial 3D sound
source.spatialBlend = 1.0f;

At 1.0, audio is purely 3D, panning dynamically across channels based on orientation and location.

Distance attenuation (Rolloff) curves

In 3D audio, volume attenuates as distance from the source increases. minDistance marks the radius of full volume, while maxDistance defines the outer threshold where sound drops to zero.

source.minDistance = 2.0f;
source.maxDistance = 25.0f;
source.rolloffMode = AudioRolloffMode.Logarithmic;

The Rolloff Mode dictates whether attenuation diminishes realistically (Logarithmic) or straight-line (Linear).

Practice Print 3D audio settings

Assign "3D" to blend and "Logarithmic" to rolloff. Print SpatialBlend: 3D | Rolloff: Logarithmic to the console.

Starter code

Player.cs
using System;

class Program
{
    static void Main()
    {
        // blend ve rolloff değerlerini tanımlayıp yazdır
    }
}

Sample solution

Player.cs
using System;

class Program
{
    static void Main()
    {
        string blend = "3D";
        string rolloff = "Logarithmic";
        Console.WriteLine("SpatialBlend: " + blend + " | Rolloff: " + rolloff);
    }
}

Expected output

SpatialBlend: 3D | Rolloff: Logarithmic

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What should Spatial Blend be set to for distance-independent 2D sounds such as UI button clicks or music?

  • 1.0 (Full 3D)
  • 0.5 (Half 3D)
  • -1.0 (Inverted)
  • 0.0 (Full 2D) Correct answer

Explanation: A Spatial Blend of 0.0 makes the sound purely 2D, ensuring uniform volume regardless of world distances.

2 Set Spatial Blend value

Question 
source.____ = 1.0f;
Answer 
source.spatialBlend = 1.0f;

Explanation: To configure an AudioSource into 3D audio mode, the spatialBlend property is set to 1.0f.

3 3D audio concepts

Term Meaning
Spatial Blend Positional blend between 2D and 3D
minDistance Nearest radius heard at full volume
maxDistance Distance where sound fades to silence
Rolloff Volume decay curve over distance

All lessons in Intermediate

1 3D model

  1. What is a Mesh?
  2. MeshFilter and MeshRenderer
  3. Primitive objects
  4. Importing a model
  5. Assigning a material
  6. Summary - 3D model

2 Lighting

  1. Light types
  2. Shadow settings
  3. Ambient and environment
  4. Baked vs realtime
  5. Lightmap baking
  6. Summary - Lighting

3 Material

  1. What is a Material?
  2. Albedo and color
  3. Metallic and Smoothness
  4. Normal map
  5. Assigning a material
  6. Summary - Material

4 Animation

  1. The Animator component
  2. Animation Clip
  3. State machine
  4. Parameters
  5. Triggering from code
  6. Summary - Animation

5 Audio

  1. AudioSource and AudioListener
  2. Importing an AudioClip
  3. Play and Stop
  4. 3D sound
  5. Grouping with a Mixer
  6. Summary - Audio

6 UI (Canvas)

  1. What is a Canvas?
  2. Text and TMP
  3. Image and Button
  4. Rect Transform
  5. Layout groups
  6. Summary - UI Canvas

7 Particle System

  1. What is a Particle System?
  2. Emission and Shape
  3. Color over lifetime
  4. Start Size and Rotation
  5. Play and Stop
  6. Summary - Particle System

8 Coroutine

  1. What is a Coroutine?
  2. IEnumerator and yield
  3. WaitForSeconds
  4. StartCoroutine
  5. StopCoroutine
  6. Summary - Coroutine

9 Prefab

  1. What is a Prefab?
  2. Creating a Prefab
  3. Prefab instance
  4. Spawning with Instantiate
  5. Prefab Variant
  6. Summary - Prefab

10 Scene management

  1. Build Settings
  2. SceneManager.Load
  3. Additive loading
  4. DontDestroyOnLoad
  5. Async loading
  6. Summary - Scene management

11 Godot 3D

  1. MeshInstance3D
  2. Camera3D
  3. DirectionalLight3D
  4. StandardMaterial3D
  5. RigidBody3D
  6. Summary - Godot 3D

12 Signal

  1. What is a Signal?
  2. Built-in signals
  3. The connect method
  4. Custom signal
  5. emit_signal
  6. Summary - Signal

13 Inventory project

  1. Project: Inventory design
  2. Item class
  3. Inventory list
  4. Add and remove
  5. Printing the inventory
  6. Summary - Inventory

14 Intermediate final

  1. Challenge 1: Material assignment
  2. Challenge 2: Coroutine delay
  3. Challenge 3: Godot signal
  4. Challenge 4: UI button
  5. Challenge 5: Final synthesis