Class EngineAudio
Plays realistic engine sounds based on RPM and throttle position.
Inheritance
Namespace: YACC.Audio
Assembly: .dll
Syntax
public class EngineAudio : MonoBehaviourRemarks
This refactored audio system provides more realistic engine sound behavior with proper RPM-to-pitch mapping.
BEST PRACTICES FOR ENGINE AUDIO:
1. Audio Sample Recording: Record your engine loops at a constant RPM (e.g., 1000 RPM, 3000 RPM, 5000 RPM). Set the sampleRecordedAtRPM parameter to match your recording.
2. Pitch Calculation: Unity will automatically calculate the correct pitch multiplier: pitch = (currentRPM / sampleRecordedAtRPM) * basePitch
3. Multi-Layer Approach: Use 2-3 audio layers for best results: - Low RPM loop (idle-3000 RPM) - Mid RPM loop (2000-5000 RPM) - High RPM loop (4000-7000+ RPM) Crossfade between them based on RPM.
4. Throttle Blending: Record both on-throttle and off-throttle loops, blend with throttle position.
5. Procedural Audio (Advanced): You CAN generate engine sounds without files using: - AudioSource.OnAudioFilterRead() for DSP - Additive synthesis (multiple sine waves) - Granular synthesis - See ProceduralEngineAudio.cs for implementation example
Fields
| Name | Description |
|---|---|
| audioResponseSpeed | How quickly audio responds to RPM changes. |
| basePitchMultiplier | Base pitch multiplier (use to tune overall engine sound). |
| crossfadeWidth | Width of crossfade (in RPM). |
| highRPMClip | High RPM engine loop (4000+ RPM). |
| highRPMSampleRecordedAt | The RPM at which the high RPM clip was recorded. |
| lowRPMClip | |
| lowRPMSampleRecordedAt | The RPM at which the low RPM clip was recorded. |
| lowToMidCrossfadeRPM | |
| masterVolume | |
| maxPitch | Maximum pitch allowed (prevents unrealistic squealing). |
| maximumDistance | Maximum distance for 3D audio. |
| midRPMClip | Mid RPM engine loop (2000-5000 RPM). |
| midRPMSampleRecordedAt | The RPM at which the mid RPM clip was recorded. |
| midToHighCrossfadeRPM | RPM range for crossfading from mid to high layer. |
| offThrottleClip | Off-throttle/deceleration sound. |
| startingSoundClip | Engine start/ignition sound. |
Methods
| Name | Description |
|---|---|
| StartEngine() | Starts the engine with ignition sound. |