Ready-to-use Unity door and key interaction system with prefabs, HUD, and demo scene.3D Door Interaction System is a simple door and key system for Unity.You can use this package to add interactive doors and matching keys to your game. It includes ready-to-use door prefabs, key prefabs, a crosshair interaction HUD, and a demo scene.Features:- 12 door prefabs- 12 key prefabs- Pick up and drop keys- Open and close doors- Locked and unlocked door system- Crosshair interaction HUD- Demo scene included- Documentation includedControls:Press E to pick up keys and interact with doors.Render Pipeline:URPUnity Version Tested:Unity 6.6Support:chandraprabhagames@gmail.com3D Door Interaction System — Technical DetailsCOMPATIBILITYCreated/tested in Unity Editor 6000.6.2f1 (Unity 6.6); Universal Render Pipeline (URP) 17.6.0. Uses Unity Input System 1.20.0 and Unity UI/uGUI 2.6.0 plus built-in Unity physics. No paid third-party runtime assets or external online service required. First-person desktop keyboard/mouse demo; other platforms/control schemes have not been verified.CONTENTS24 unique FBX models: 12 doors and 12 matching keys. 30 prefabs (12 doors, 12 keys, pack/demo assembly prefabs, a Player and CrosshairHUD). 4 C# MonoBehaviour scripts: DoorInteraction, KeyItem, PlayerKeyInventory, PlayerScript. 1 playable DemoScene. 82 visual material (.mat) assets plus 1 physics material. 1 CrosshairDot.png UI sprite.GEOMETRY (averages across the source FBX files)12 doors: average 1,075 polygon faces / 2,170 triangles each (range 348–1,862 polygon faces / 696–3,764 triangles).12 keys: average 183 polygon faces / 415 triangles each (range 179–187 polygon faces / 400–432 triangles).PER-FBX GEOMETRY (source mesh faces / triangle equivalents):Door_01: 1334 faces / 2708 trisDoor_02: 1258 faces / 2596 trisDoor_03: 1862 faces / 3764 trisDoor_04: 1182 faces / 2364 trisDoor_05: 1020 faces / 2040 trisDoor_06: 1290 faces / 2580 trisDoor_07: 1388 faces / 2816 trisDoor_08: 1356 faces / 2712 trisDoor_09: 780 faces / 1608 trisDoor_10: 348 faces / 696 trisDoor_11: 564 faces / 1128 trisDoor_12: 516 faces / 1032 trisKey_01: 183 faces / 416 trisKey_02: 179 faces / 400 trisKey_03: 187 faces / 432 trisKey_04: 183 faces / 416 trisKey_05: 179 faces / 400 trisKey_06: 187 faces / 432 trisKey_07: 183 faces / 416 trisKey_08: 179 faces / 400 trisKey_09: 183 faces / 416 trisKey_10: 187 faces / 432 trisKey_11: 179 faces / 400 trisKey_12: 183 faces / 416 trisLODs: No.MODEL ANIMATIONS: No baked FBX animation clips. Door hinge opening/closing uses runtime C# rotation; key pickup/drop uses scripting and Rigidbody physics.TEXTURESCrosshairDot.png is a 32x32 RGBA, 8-bit/channel sprite with transparency. The 3D models use editable URP materials with colors/parameters, not image texture maps. No albedo, normal, metallic, roughness, AO or emission bitmap maps are supplied for the models.TECHNICAL FEATURES / LIMITATIONSKey-ID door matching and locking; hinge-controlled door motion; optional prevention of closing on characters/physics objects; ray/sphere-cast camera targeting; key pickup/carry/drop; first-person movement. Requires URP and Unity Input System. Includes one playable demo and one held key at a time; no save/load database, multiplayer, or native touch/gamepad bindings.AI tool: OpenAI Codex.OpenAI Codex was used to create and iteratively refine the full 3D Door Interaction System package. AI assistance covered the 12 door models and 12 matching key models, the four C# runtime scripts, Unity prefabs and component setup, materials, first-person player controls, UI, playable demo scene, and package documentation.Following initial AI generation, the package was iterated and integrated into a reusable Unity system: each door and key was given a matching ID; moving panels were configured with hinges and collision/physics behavior; key pickup, hold and drop mechanics, camera-based interaction, door unlocking/opening, and doorway occupancy checks were implemented; individual editable prefabs, the demo scene, and usage instructions were assembled. These refinements and integration were also carried out with AI assistance directed by the publisher.The delivered package contains AI-assisted functional 3D assets and source code, not just AI-generated marketing images.
