Designing explosion Haptics in Unreal
A well-designed explosion rumble pattern reads as an impact: a sharp, strong-motor attack spike that decays quickly, with a low-frequency tail that carries the pressure wave. The reason this shape works is that the first 50–100ms sell the hit; the decaying tail keeps the effect readable without overpowering the game audio.
When to use it: pair it with the actual audio explosion cue — the tactile peak should land on the audio transient, not slightly before or after. Tuning notes: Explosions are the hardest effect to tune because they fight the game audio for attention. The classic failure is an over-long tail that muddies the next cue; the fix is to cut the decay before the rumble becomes a drone. On real controllers, the strong motor carries most of the pressure wave while the weak motor should stay quiet or pulse once at the moment of detonation — giving both motors a full-strength tail is the most common reason an explosion feels like a vibration rather than a hit.
Engine integration
In Unreal, Unreal plays pre-authored haptic assets via PlayHapticEffect; for procedural curves, update the motor speed each tick from your own curve sample rather than a fixed pattern. For the explosion pattern specifically, author the {effect} envelope as a float curve asset so designers can tune the shape without touching code. Unreal's PlayHapticEffect is asset-driven and efficient at runtime, but the asset pipeline is where designers actually tune feel — so expose the {effect} amplitude and duration as curve keys and let the gameplay team iterate on them in-editor rather than recompiling code each time the feel changes.
Unreal bakes feel into content assets rather than code: a {effect} envelope authored as a CurveFloat is a gameplay asset that designers own, which means amplitude, duration and attack can be tweaked in the editor and hot-reloaded while the game runs on a controller. PlayHapticEffect plays those assets on the active device automatically, and you layer them with the feedback system's triggers if you want the effect gated by gameplay events. The cost of the asset pipeline is iteration speed — a code-driven curve gives you a live loop, while an asset forces a re-import — so for a first draft of an explosion, prototype the envelope in Blueprint, then bake the winner into a curve asset for shipping.
Haptic feedback bridges the gap between digital interaction and physical sensation. Matching the visual and auditory cues with the tactile response is what makes the effect feel intentional rather than decorative.