PB Movement for Voices of the Void

Gives your character Half-Life 2 / Source-engine movement - air-strafing, bunnyhopping, and surfing - in place of VotV's default movement.

What you get

Air-strafing, bunnyhop (manual or auto), surfing on steep ramps Source-style, classic HL2/Source style character movment straight from Project Borealis.

Built for VotV a09 / a09n.

Configuring it - PBMovement.ini

Surf feel (if ramps don't behave)

Nothing to tune: whether a ramp catches you is decided the way Project Borealis decides it; if sliding along the surface would throw you upward faster than a jump, it isn't treated as a floor and you surf. BounceMultiplier in [Surf] is the only knob left (extra bounce off slope clips; 0 = none).

The remaining sections ([Acceleration], [Braking], [EdgeFriction], [Slope], [Misc]) are for fine-tuning the exact feel - the defaults match Project Borealis, so you can leave them alone unless you're chasing a specific feel.

How it works

PB's UPBPlayerMovement/APBPlayerCharacter are native engine classes that can't be registered into the shipped game, so instead of instantiating them we port PB's logic into the mod and graft it onto VotV's existing UCharacterMovementComponent. Two techniques:

1. Per-instance vtable swap: on player spawn we copy the component's vtable, point the movement virtuals (CalcVelocity, DoJump, HandleSlopeBoosting, GetMaxSpeed, NewFallVelocity, ShouldLimitAirControl) at our ported C++, and swap the instance's vtable pointer. Only the player's component is affected.
2. Blueprint bytecode patch: VotV's settings graph overwrote AirControl/JumpZVelocity every load, so we NopRange those two EX_Let writes in ExecuteUbergraph_mainPlayer (size-preserving) so PB's values stick.

Credits & license

Movement design and reference implementation by Project Borealis (PBCharacterMovement), which is released under the MIT License. This mod ports that movement logic and grafts it onto VotV's player at runtime.

Physics reference from Jiangwei Chong's Half-Life Physics Reference

1.0.4

• New: Speed music ([Music]). Play a local WAV, MP3, or FLAC after exceeding SpeedOn (800 uu/s); it fades out below SpeedOff (650). An empty File disables it. VotV’s music and master volume sliders apply. Requires EnableGraft = true.

• Fixed: Forward bunnyhops no longer lose speed ([ABH] JumpBonusNeverSlows, default: true). Jump bonuses that would slow the player are discarded; ABH, AFH, and ASH are unchanged. Set to false for Source behavior.

• Fixed: Air-strafe acceleration is now frame-rate consistent ([Misc] SimulationTimeStep, now 1/33). This avoids extra movement steps above 33 FPS and matches Half-Life 2 single-player behavior.

• Fixed: Exhaustion now prevents sprinting ([Misc] RespectExhaustion, default: true), including ABH and swimming. Dreams still ignore vitals.

• Fixed: Sprint now honors agility and heavy carry. Agility scales sprint up to 1.25×; heavy carry uses a 183.3375 uu/s gait instead of crouch speed.

1.0.3

• Fixed: Swimming is no longer a crawl ([Water] EnableWaterMove, default: true). Water now uses HL2-style swimming instead of the air-movement code that capped it at roughly 57 uu/s. Swimming speed is controlled by WaterSpeedFraction, while WaterFriction controls drag. Scuba still improves your speed: roughly 210 uu/s without air and 280 with it. Sprinting and crouching no longer change your speed while fully submerged. Vertical movement still uses VotV’s existing swim controls.

• Changed: Waist-deep water now makes you swim even when standing on the bottom (SwimWhenWaistDeep, default: true). This matches HL2 and prevents sprinting along the bottom of deep water. Set it to false for VotV’s original behavior. Shallow wading is unchanged, and standing on the bottom no longer makes you bob.

• New: Rivers now carry the player (EnableWaterCurrent, default: true). River currents now push you in the same direction as floating objects. On the main map, this produces about 500 uu/s² of acceleration: idling drifts at roughly 85 uu/s, swimming downstream reaches around 300, and swimming upstream remains possible. Adjust WaterCurrentScale to change the strength, or set it to 0 to disable currents.

1.0.2

• New: Accelerated Back Hopping ([ABH] EnableABH, default: true). Adds the Orange Box jump-speed bonus missing from PB. To ABH, jump forward, turn around in mid-air, release the movement keys, and jump again on landing. Crouching accelerates fastest. At high speed, hold S for AFH or S+A/D for ASH. Forward bunnyhops can now also reach 1.5× run speed. Set this to false for pure PB jumping.

• Fixed: Crouching no longer stops you dead. The game could reject a crouched move and zero your velocity because crouched players were not allowed to walk off ledges. That behavior is now disabled, which also allows crouched ABH to work correctly.

• Changed: BrakingDecelerationWalking reduced from 381 to 190.5, matching PB/HL2. The old value applied more friction than crouched movement could overcome, making crouching and initial acceleration feel sluggish. Unsafe values are now clamped with a warning, and the startup log shows the acceleration and friction budget for each gait.

• Fixed: Slopes no longer drain speed. Horizontal ground velocity is now preserved while moving over ramps.

• Fixed: Ramp landings now use PB’s actual landing rule. A landing is rejected only when sliding along the surface would launch you upward faster than a normal jump. This prevents ordinary slopes from incorrectly putting you into air movement. SurfEntrySpeed and SurfEntryMaxNormalZ have been removed.

• Fixed: AirSlideSpeedCap now works. It correctly limits mid-air strafing while sliding. Air-slide crouch detection, HL2-style substepping, and over-speed checks have also been corrected to match PB.

1.0.1

• New: GroundTurnFriction ([Braking], default 8.0) - turning now grips like vanilla VotV instead of drifting. Set to 0 for the old drift. Does not affect bunnyhop landings, carried speed, or air-strafing.
• Fixed: BrakingFriction did nothing - the value was hardcoded internally; the INI value now actually works.
• Changed: BrakingDecelerationWalking default 190.5 -> 381
• Fixed: Ground traction is now pinned at full, and surf/air traction logic is unchanged.

New settings ([Misc])

• DisableRagdoll (default false) - completely disables player ragdolling (falls, pass-outs, deaths, ragdoll key). Patches the game's ragdollMode function to a no-op; sleep/death sequences still work, only the flop is skipped.
• DisableFallDamageCrouch (default true) - the game force-crouches you on non-lethal fall damage, killing all momentum. This option disables that entirely.