procedural game audio Asbjoern Andersen


How do you keep your game audio varied – without needing countless individual audio files? Procedural sound design can help with exactly that, and in this hands-on guide, senior lecturer, teacher fellow and author of the Game Audio Implementation book, Richard Stevens, demonstrates how the concept works in the Unreal Engine.

When creating a sound effect for a movie you’ll know that the audience is only going to hear it on one specific occasion, and you’ll likely build it up through editing and layering different sound elements to get just what you want.

01_game_audio_Explosion

Figure 01 ‘An explosion’

 

Most games, like sports, are about skill and mastery, so the player will be repeating similar actions again and again, and consequently they will be hearing the same sounds again and again. The trouble is that we’re very sensitive to this kind of repetition, since it just doesn’t happen in real life.
 

Video Thumbnail

Video: Explosion Baked


 
The obvious answer is just to have loads and loads of sounds but it would be far too much work to create 30-40 versions of every sound in the game (plus there are obviously limitations as to how much we can fit on a disk!).
If we look at our ‘explosion’ sound again we can see that the final sound is made up of different characteristic components, and this idea is key to starting to think about procedural approaches to sound design.

02_game_audio_Explosion_Components

Figure 02 ‘Explosion Components’

What we want to do is to keep these components separate when we import them into a game so that we can recombine them in different ways at run time. A lot of sounds in games aren’t ‘sounds’ at all, they are systems of sounds. This kind of procedural approach requires a different way of thinking, and sometimes different kinds of sound assets, since we often want to isolate the individual components that make up a sound.

When we bring these components into a Sound Cue in the Unreal Engine we can build a system of playback, and by having a few different versions of each component we can randomly combine them to create variation.

03_game_audio_Procedural_Explosion

Figure 03 ‘Procedural Explosion’

 

Video Thumbnail

Video: Explosion Components


 
By taking this approach we don’t need thousands of complete sounds in our game to be able to get thousands of different sounds out of the system. Randomizing the combinations of layers can vastly increase the number of potential outcomes with only a few additional sounds.

By taking this approach we don’t need thousands of complete sounds in our game to be able to get thousands of different sounds out of the system

In the above example we have four sets of three possible sounds that can potentially be heard so this will give us 81different sound outcomes. If we added just one other ‘Crack’ element then we’d get 108 potential sounds.


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We can increase this variation even more by adding some slight randomized delays and modulations of pitch and volume to each element, giving us.. erm… a very large number of possible outputs.

04_game_audio_Delay_Mod

Figure 04 ‘Adding Delay and Modulation nodes’

Video Thumbnail

Video: Explosion Delays and Modulation


 

Another thing we might want to do is to change the sound depending on what was being blown up, or the materials of nearby objects. Again by keeping these material components separate we can choose to layer them into the Sound Cue when appropriate by using a switch.
 


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By getting information from the game about what type of material is being blown up we can use this to control the switch, and therefore which material components of sound get added to the overall explosion sound.

05_game_audio_Explosion_Materials

Figure 05 ‘Explosion Materials’

Thoughts on the term ‘Procedural Sound Design’:

In writing the book we made a conscious decision to term this kind of sound design, that is typical in the current practice of game audio, ‘Procedural Sound Design’ to differentiate it from ‘Procedural Audio’.

Andy Farnell, who coined or at least popularised the term ‘Procedural Audio’ sees it as any kind of system where the sound produced is the result of a process. He describes these ideas more fully here. So under that definition, as soon as you set up any kind of system of playback you could see it as being procedural audio.

However there has been a lot of important work and progress in terms of procedural audio for games in the last few years (see http://proceduralaudionow.com/), and this has encompassed a variety of techniques, but there has been some emphasis on the idea of these procedural systems being synthesis based, which ultimately is probably the most flexible solution for interactivity.

This is a specialist field which we don’t go into in any depth in the book since there are other great books out there on this (not least Andy’s book ‘Designing Sound’). In the book we attempt to describe the range of procedural approaches by saying, “This approach to sound design exists on a spectrum from procedural sound design, where we tend to be manipulating pre-existing assets, to procedural audio, a term more frequently used when systems of synthesis are used to generate the sounds themselves (with much in between that combine both approaches)”.

To throw another thing into the discussion, when discussing music systems we also use the term algorithmic, which again could be used to describe any kind of system of playback. Although we could just call this procedural music (as others such as Karen Collins have done), but we felt it worth preserving and highlighting ‘algorithmic’ given the long history of algorithmic techniques explored for music in the past, which a search for ‘procedural music’ is going to miss.

 

Video Thumbnail

Video: Explosion Materials


 

Now we have all the elements of a sound as separate components we can also do other things with them, like spatialize them around the player in different ways. For the Game Audio Implementation book we built a simple system that will throw sounds around the player for people listening in 5.1 or 7.1. This could be used for elements of the explosion itself or for debris.

06_game_audio_Spatialized_Diagram

Figure 06 Diagram

 

07_game_audio_Spatialized_Detail

Figure 07 Detail

 

This was done in Unreal’s Blueprint system – which looks a bit daunting at first but once you get the hang of it you can pretty much do anything you might dream up!

08_game_audio_Blueprint

Figure 08 Blueprint

 

Video Thumbnail

Video: Explosion Spatialized


 
By using a procedural approach to sound design we now have an explosion sound that’s different each time, is ‘aware’ of the different materials involved in the explosion, and spatializes around the player in stereo, 5.1 or 7.1.
 

A big thanks to Richard Stevens for his insights on procedural game audio! If you want to know more about procedural sound design for games then check out the Game Audio Implementation book from Focal Press. If you’re new to UE4 you can get UE4 here for free, and you can download all the levels that go alongside the book here (also for free!) to get started.
 

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  • Environments Rare Winds Play Track 102 sounds included, 233 mins total $149 $74.50

    From all 4 earth’s corners, air streamlines the environment and shapes our stories. Discover the cinematic world of rare winds!


    This sound library is the ultimate achievement of a really ambitious project of recording winds from very remote places across the world.

    Included are authentic recordings from the Boreal region (North hemisphere: in Canada and Iceland), from the Austral region (South hemisphere: Tierra del Fuego in Argentina and the Last Hope province in Chile), on Islands in Mediterranean region (Thira in Greece), in the Sahara desert (Marocco), Isle-aux-Grues (Canadian winter), and more (see file list for more details)


    These were recorded either in urban settings, countryside, or complete wilderness.

    Included is a set of useful synthesized, tonal, and designed winds.

    The sounds are categorized into 3 folders: Designed, Indoor & Outdoor.

    WHAT’S INSIDE:

    • 102 stereo files
    • Highly focused and meticulously edited sounds
    • Ready to use Loop
    • Urban area and Wild area
    • Useful Designed & Synthesized Wind Sounds
    • Recordings from the Boreal region (North) in Iceland & Canada
    • Recordings from the Austral region (South) in Argentina & Chile
    • Recordings from Islands in Greece & Canada
    • Recordings from the desert in Marocco
    • Abandonned houses and shelters
    • Marina, lake, forest, car, flags, arctic, metal pole, prairie, street, mountain, grass, …
    50 %
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    Ends 1574463599
    Add to cart
  • City Life Nature Ambients Bundle Play Track 263+ sounds included, 683 mins total $160 $80

    This bundle includes 4 different libraries.

    The Baltic Sea sound library is compilation of 56 WAV files recorded with Sound Devices 702, Rode NTG3, Sony PCM-M10, two Oktavas MK012 set in MS, XY and ORTF setup. All the sounds were recorded far away from the cities and roads. Since most of the sounds were recorded in late winter, there are no insects or birds in background. There are few files that includes the sound of birds, but I left them on purpose, because of the overall feel of the files. In this library you will find beautiful sound of waves crushing on the rocks and shore, recorded from different perspectives in different stereo configurations, during calm and windy days. In addition to those sounds, there’s foley like walking, running and swimming in the water.

    The Harbours Of Norway sound library features 25 files with ambients recorded in Myre, Sto and Nyksund, very small towns with direct access to the sea. Most of the sound effects were recorded at night, but since it’s a polar day time of the year, it was very pleasurable to walk and look for convenient places to set up my gear. Everything was recoded with ORTF setup built from two Sennheisers MKH 8040. Inside this library, you’ll find a lot of seagulls, waves crushing on the rocks and plants, windy ambients from the cliff, industrial sound from port in Myre with ship unloading the cargo, walla with steam engine boat and additional sounds from boat engine market and air cooling aggregates from food containers. Every file was recorded in 96kHz, edited (i removed any unintentional bumps, pops and unwanted sounds). I limited EQing to removing harsh frequencies, or enhancing a little bit the good sounding ones. At the end of the chain there is a small compression, for louder sounds.

    The Summer Ambients sound library contains 33 beautiful WAV files recorded with Sound Devices 702, Rode NTG3, two Oktavas MK012 in MS and stereo XY pattern. All sounds were gathered in different and beautiful places like forests, lakes, meadows or swamps. You can expect amazing ambients, textures, different birds, insects, forest during rain, calm and windy days. It’s a perfect library for designing background sounds. Everything was recorded in amazing Masuria in Poland.

    Summer ambients Update – library got 2x bigger and heavier than the original library. 59 additional files, 123 minutes of high quality audio recorded with Sennheiser MKH 8040 ORTF setup, Rode NTG3, Oktava MK012 XY setup plugged into SD702 and Sony PCM-10. It features ambients from the forests, ponds, swamps, meadows, lakes and suburbs recorded is very quiet locations, mostly just before the sunrise, during the day and before sunset far away from the cities.

    Water Flow sound library took me about six months to record, consumed about 15 thermoses of tea and 42 litres of gasoline to get to all locations. It offers 90 BWAV files recorded in different locations. Huge part of this library is based on the recording sessions on the rivers. Two completely different locations, recorded regularly for the last 5 months allowed me to create this unique sound library. Most of the recording sessions took place during winter just before the sun was rising to reduce the amount of unwanted sounds. Almost all recordings are completely clear and only few have birds in background, since it was my intention to record some location ambients with natural backgrounds.

    You can see the metadata and sound list below.

    50 %
    OFF
    Ends 1574463599
    Add to cart
  • Cars Cars In Motion Play Track 561+ sounds included, 340 mins total $150 $75

    The Cars In Motion sound library gets you exterior sounds of cars driving at different speeds, slow/medium/fast/very fast pass-bys, reverse sounds, accelerations, braking sounds and a lot of additional files. You’ll find different engines, and cars with different character.

    From a small BMW 114i through to a powerful Jeep Grand Cherokee 4.7 V8 with Magna Flow exhaust, up to a fast twin turbo BMW 640D F12. In addition to cars there are also files covering big machines like tractors and excavator.

    The library features 561 WAV files with total length of 340 minutes, recorded in 96kHz and 24 bits with a Sound Devices 702, two Sennheisers MKH 8040, Rode NTG3 and Sony PCM-M10.

    Here are the cars included in this library:

    • Audi A4 Allroad 2.0 TFSI – 73 files – 73 minutes
    • Audi A4 B8 2.0 TDI Avant – 11 files – 10 minutes
    • BMW 114i E87 – 20 files – 10 minutes
    • BMW 530D E60 – 55 files – 21 minutes
    • BMW F12 640D Gran Coupe – 87 files – 49 minutes
    • Excavator MF 860 – 30 files – 20 minutes
    • Jeep Grand Cherokee 4.7 V8 – 62 files – 51 minutes
    • Renault Kangoo 1.6 16V – 71 files – 32 minutes
    • Renault Master II 2.8 dTi – 21 files – 13 minutes
    • Renault Master F3500 dCi135 – 30 files – 12 minutes
    • Tractor Case II CX90 – 15 files – 10 minutes
    • Volkswagen Golf II – 26 files – 13 minutes
    • Other Cars – 60 files – 23 minutes

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