ComputeVelocitySystem

Package: com.hypixel.hytale.server.npc.systems

public class ComputeVelocitySystem extends SteppableTickingSystem

Computes the NPC’s velocity from the position delta between tick start (stored by NPCPreTickSystem) and the current position. The velocity is written to the Velocity component as (currentPosition - oldPosition) / dt.

Constructor

public ComputeVelocitySystem(
    @Nonnull ComponentType<EntityStore, NPCEntity> npcEntityComponentType,
    @Nonnull ComponentType<EntityStore, Velocity> velocityComponentType,
    @Nonnull Set<Dependency<EntityStore>> dependencies
)

Query

Matches entities with NPCEntity, TransformComponent, and Velocity components.

Tick Logic

@Override
public void steppedTick(
    float dt,
    int index,
    @Nonnull ArchetypeChunk<EntityStore> archetypeChunk,
    @Nonnull Store<EntityStore> store,
    @Nonnull CommandBuffer<EntityStore> commandBuffer
)

Reads the current position from TransformComponent and the old (tick-start) position from NPCEntity.getOldPosition(), then sets the velocity to (current - old) / dt on all three axes.

Parallelism

Returns EntityTickingSystem.maybeUseParallel(archetypeChunkSize, taskCount).

Related Types

• NPCPreTickSystem — stores tick start position used by this system
• MovementStatesSystem — runs after this to update movement state flags
• SteppableTickingSystem — base class