Build readable stealth encounters with sight cones, partial cover, hearing, shadow zones and independent target awareness. Includes seven demos, a museum heist and guided setup.Give your guards something to notice.SightLine is a focused 3D stealth detection toolkit for Unity. Build awareness over time, let cover break line of sight, react to gameplay noise, and keep track of what each observer last saw. Reusable Detection Profiles keep sensing rules separate from the behavior that responds to them.Start with one observer and one target. Set the view angle, range and detection timing, then connect detection events to your own alarms, patrols, combat or UI. Custom inspectors show the current evidence and awareness so you can see why a target is visible, hidden, out of range or blocked by cover.MAKE COVER AND VISIBILITY MATTERUse up to eight sample points to distinguish partial exposure from full cover. Tune target visibility, optional distance falloff and a short loss-of-sight grace period. Place manual Shadow Zones where you want darkness to reduce visibility, without sampling scene lighting or requiring a specific render pipeline. Overhead 3D question marks and exclamation marks make suspicious and detected states easy to read.HEAR A LOCATION. REMEMBER A TARGET.Noise Emitters and Noise Listeners turn authored gameplay events into hearing stimuli, with range, strength and wall attenuation. Multiple-target sensing maintains separate awareness and last-known positions, with priority-based focus and events for detection, loss and focus changes.LEARN THROUGH SEVEN DEMOSExplore Basics, Profile Comparison, Alarm Response, Partial Cover, Hearing and Multiple Targets. Then play Museum Heist: sneak through a small museum, read scanning patrols, collect a keycard, steal the prism and return to extraction. The examples show how sensing can drive gameplay and include their C# source.GET FROM IMPORT TO YOUR FIRST DETECTIONA guided Getting Started tutorial opens directly inside Unity. Scene-setup actions, five reusable presets, live inspectors and an offline PDF manual help you configure a first observer and adapt the system to your own game.SightLine includes editable C# source. It requires no third-party SDK, service, account or subscription. The runtime uses Unity 3D physics; the supplied demos use Built-in rendering and Unity UI.Scope: SightLine supplies sensing and example responses. It does not include general-purpose pathfinding, a behavior tree, automatic light/shadow detection, microphone analysis, audio playback, networking or 2D physics support. Museum Heist uses the legacy Input Manager or Both setting. URP/HDRP demo materials are not supplied.Sensing- Configurable range, field of view and obstacle layer mask.- Detection buildup, decay, release threshold and loss-of-sight grace.- Optional distance falloff and authored target visibility.- Up to eight target sample points for partial exposure.- Manual BoxCollider Shadow Zones; overlapping zones use the strongest reduction.- Single-target and multiple-target observers.- Independent per-target awareness and last-known positions.- Priority-based target focus, with awareness used to break priority ties.- Detection, loss and focus-change events.- Configurable sensor sample interval and scaled/unscaled sensing time.Hearing and feedback- Noise Emitter and Noise Listener components.- Noise strength, hearing range, minimum threshold and occlusion attenuation.- Hearing reports a location; it does not identify or visually detect a target.- Camera-facing 3D suspicious/detected indicators with replaceable model roots.- Clipped search-cone visualization and waypoint patrols in the museum example.Workflow and included content- Five Detection Profile presets: Balanced Guard, Watchful Guard, Patient Observer, Security Camera and Keen Hearing.- Seven demo scenes, including a playable Museum Heist.- Guided Unity tutorial, contextual setup actions and custom inspectors.- Offline PDF manual with contents and bookmarks.- Editable runtime, editor and demo C# source.- Built-in Standard demo materials and a decorative FBX sculpture with a reusable prefab.- No third-party SDKs, runtime services or subscriptions.Requirements and limits- Unity 2022.3 or newer; tested imports in 2022.3.62f3 and 6000.5.7f1.- Unity 3D Physics. Demo UI requires Unity UI (com.unity.ugui).- Built-in render pipeline for the supplied demo materials.- Input Manager or Both for the demo controls; no Input System-only demo controller is included.- The sensing code has no render-pipeline package dependency. URP/HDRP demo appearance is not validated and material conversion is not included.- Sight queries use fixed buffers of 32 ray hits and 16 eye-overlap colliders. Saturation returns QueryCapacityExceeded rather than reporting a clear view.- Patrol routes are explicitly configured waypoint loops, not navigation/pathfinding.- Windows x64 demo build tested for compilation; other platform builds and multiplayer integration are not verified.Claude (Anthropic) was used as an AI coding assistant during development for code implementation, documentation, and editor tooling. All output was reviewed and approved by the developer.
