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Build dynamic NPC and vehicle interaction systems with a unified NPC = Player architecture. Plug & play, scalable, and NavMesh-free.The core scripts and logic are compatible with all render pipelines (Built-in, URP, HDRP). The demo materials are set up for the Built-in Render Pipeline but can be easily upgraded using Unity's standard material converterSupport & ContactOfficial Website: gmtechstudios.comOnline Documentation: Quick Start & Technical Guide (Preview)Support Email: bridgeengine@hotmail.comBridge Engine – GTA-Style NPC & Vehicle Interaction SystemBridge Engine is a core AI and interaction framework built for Unity developers who want to create dynamic gameplay systems — without complex setups or fragmented architectures.This is not a full open-world system.Bridge Engine focuses on the foundation layer: NPC behavior, player interaction, and vehicle systems working together in a unified structure.🧠 Unified NPC = Player Architecture (Core Advantage)Bridge Engine uses a true NPC = Player architecture.This means characters are not split into separate AI and Player systems.Instead, every character uses the exact same core systems:MovementAnimationInteractionCameraState logicThe only difference is how the character is controlled:• When controlled by AI → the system generates decisions• When controlled by Player → the system receives inputEverything else remains identical.Animations, movement behavior, interaction flow, and state transitions all use the same pipeline.This allows seamless switching between AI and Player control at runtime without breaking logic, animations, or behavior consistency.🚗 Vehicle Interaction SystemBuilt for realistic and conflict-free vehicle interaction.Real-time vehicle entry & exitDoor-side awareness (left/right animations)Smart seat targetingMulti-character supportSmooth state transitions🧠 Advanced Seat Manager SystemBridge Engine includes a powerful seat management system designed to prevent chaos when multiple NPCs interact with vehicles.Each seat follows a clear 3-state logic:🟢 Available → Seat is free and can be used🟡 Reserved → Seat is locked for a specific NPC🔴 Occupied → Seat is takenThis ensures:No seat conflictsNo multiple NPCs targeting the same seatOrganized and natural vehicle entry behaviorNPCs automatically select the correct door and use the proper animation (left/right side), resulting in realistic and believable interactions.No teleporting. No snapping. No chaos.🧭 Custom A* Navigation System (No NavMesh)Bridge Engine includes a fully custom navigation system:Automatic waypoint generationAutomatic connections (no manual setup)Dynamic path recalculationObstacle detection & avoidancePerformance-aware path updatesNo Unity NavMesh required.Designed for flexible and dynamic gameplay scenarios.🤖 AI & Interaction FrameworkBridge Engine acts as a central AI system that connects:Character movementNavigationVehicle interactionGroup behaviorBehavior dynamically adapts based on:Player state (on foot / in vehicle)Environment changesTarget changes👥 Squad & Group Behavior SystemBridge Engine includes an advanced squad system with player-controlled group commands.Players can issue commands such as:Follow modeHold positionNPCs react intelligently based on distance and context:Run when far from the playerWalk when closeAdjust speed dynamicallyThe system also features:Dynamic formation systemAutomatic slot assignmentContext-based spacingObstacle-aware movementSmooth transitions between statesNPCs avoid obstacles, maintain formation, and move as a coordinated group without breaking behavior.This creates natural, responsive, and believable group AI.🎮 Character & Camera SystemUnified movement for AI and PlayerBuilt-in camera systemPlayer ↔ Vehicle transitionsSmooth and consistent control flow⚡ Designed for Real DevelopmentBridge Engine is built for actual projects, not just demos:Rapid gameplay prototypingClean system architectureReduced setup complexityReusable core systems⚠️ Important Scope (Read Before Purchase)This is the Core Edition.It focuses on interaction and AI foundation systems.It does NOT include:Traffic systemsLarge-scale city simulationMassive open-world environmentsAdvanced systems such as traffic, city AI, and dynamic urban features are currently in development and planned for future versions, including Bridge Engine 2.🎯 Who This Asset Is For• Developers building AI-driven gameplay systems• Projects requiring NPC and player interaction• Vehicle-based gameplay mechanics• System-focused development workflows• Teams looking for reusable gameplay architecture💡 Key Advantages• Unified NPC = Player architecture• No NavMesh dependency• Clean and extensible system design• Built as a scalable core frameworkNote:Animation Rigging is required for IK featuresDemo models are placeholdersFocus is on systems, not visualsCore Architecture------------------------------------------------------------NPC = Player Unified AgentSeamlessly share the exact same logic between players and AI agents.Runtime Role SwitchingInstantly switch control between NPC and Player without duplicating logic or controllers.------------------------------------------------------------Vehicle & Squad InteractionDynamic Vehicle SystemSmooth and realistic real-time vehicle entry and exit.Advanced Seat ManagerIncludes a 3-stage validation system:• Empty seat validation• Seat reservation system• Door conflict preventionGroup IntelligenceSupports squad and group-based vehicle interaction.Smart AssignmentSlot-based seat assignment with integrated leader-follower logic.------------------------------------------------------------Custom NavigationNo NavMesh / No GridFully independent and performance-focused navigation system.Custom A* PathfindingBuilt from the ground up for large-scale open-world environments.Runtime Obstacle AvoidanceDynamic path recalculation based on moving objects and environment changes.------------------------------------------------------------Built-in Camera SystemNo Cinemachine RequiredLightweight standalone camera system included.Dual ModesThird-person on-foot and vehicle camera support.Smooth TransitionsSeamless switching between walking and driving states.------------------------------------------------------------Animation & IK System(Requires Unity Animation Rigging package)Vehicle IK IntegrationLightweight IK system for realistic interaction.Driver DetailsHands aligned to steering wheel, with proper foot grounding.Passenger RealismNatural hand placement for non-driving characters.------------------------------------------------------------Developer & Editor ToolsEditor Waypoint ToolFull in-scene editing (move, select, delete).Fast SetupQuick waypoint placement with optional linking.Seamless WorkflowAuto-setup support for faster iteration.Ready to UseModular and extensible system with included demo scene.AI USAGE DISCLOSUREAI tools were used as a supportive aid during development.Their usage was limited to:• Technical research and concept exploration• Assistance with problem-solving• Improving documentation clarity and languageAll core systems, gameplay logic, and final implementations were fully designed,developed, and validated manually by the developer.No auto-generated or unverified code is included. The framework is structured,tested, and built to ensure originality, stability, and performance.