UV Light

Sweeping a specialized beam across a sterile surface changes the way an environment communicates with the player. The UV Light pack introduces dedicated UV emitters that interact selectively with target objects across a scene. Instead of treating lighting purely as ambient illumination, this system uses focused emission parameters to expose hidden elements only when exposed to specific wavelengths. The workflow is arranged through two distinct reactive actors: a text render actor suited for readable messages and a decal-based actor suited to flexible projection across varied surfaces.

Directing Illumination with UV Emitters

At the center of this implementation sits the UV emitter. In game environments requiring hidden layers of information, standard light sources illuminate everything within their attenuation radius indiscriminately. UV emitters operate with selective logic, dictating where and how reactive actors respond to being illuminated.

By defining specific emission sources, level designers can place handheld torches, stationary blacklight lamps, or mounted investigative spotlights that exclusively interact with compatible elements. The emitter acts as the catalyst, driving the transition between concealed states and active visibility across the scene geometry.

Positioning an emitter requires evaluating both line of sight and cone angle. Because the system distinguishes between general room lighting and UV light, scenes can maintain moody, low-light atmospheres while retaining the ability to uncover hidden cues without blowing out scene exposure or breaking the mood of a shadow-heavy level.

Revealing Hidden Messages Through Text Render Actors

The first actor type provided in the pack uses text render technology to display concealed text. Standard textures carrying written notes or clues often require unique material instances or texture maps for every single phrase, adding memory overhead and slowing down puzzle iteration. The text render actor solves this problem by displaying alphanumeric strings that remain invisible until a UV emitter casts light across their boundary.

This approach supports static phrases as well as generated text strings. In dynamic gameplay environments where passwords, access codes, coordinates, or atmospheric notes change between sessions or player runs, generated text is critical. Designers can pass runtime string data directly into the text render actor, allowing randomized procedural puzzles to populate walls, desks, or equipment displays seamlessly.

Readability remains clean because text render components generate sharp typographic contours directly in world space. When the UV light cone sweeps across the actor, the text appears naturally within the illuminated field, fading or disappearing again once the light source moves away. This behavior supports gameplay styles focused on investigation, environmental clues, and procedural puzzle solving.

Projecting Surface Details with UV Light Decal Actors

While text actors excel at readable messages and codes, non-textual indicators require an alternate visual approach. The pack's second actor relies on decals to provide complete visual freedom across irregular surfaces. Decals project directly onto static meshes, skeletal meshes, and architectural modular pieces, conforming to corners, cracked plaster, and uneven props without requiring unique geometry modeling.

Using decals opens up extensive creative options:

• Hidden symbols, sigils, and navigation arrows painted onto environmental surfaces
• Forensic traces, such as footprints, fingerprints, and fluid residue revealed during searches
• Concealed warning icons, directional markings, or architectural guides that direct navigation
• Illustrations, drawings, and hand-drawn maps obscured under standard illumination

Because the decal actor responds specifically to the UV emitter logic, visual elements remain unseen in normal lighting. Once the UV beam crosses the surface, the decal projects its material channels, blending with the underlying world texture while looking firmly grounded in the environment. This separation prevents visual clutter during standard navigation while rewarding players who systematically search their surroundings with an active UV light source.

Blueprint Architecture and Project Implementation

The system is built on Blueprints, giving developers accessible logic nodes to adjust emitter behavior and reveal thresholds. The underlying Blueprint framework links the presence of the UV emitter to the reactive visibility states of both the text render and decal actors. Developers can inspect, modify, and extend these graphs to fine-tune how quickly an actor becomes visible, whether the reveal is binary or gradual, and how the actors respond when an emitter leaves their radius.

Because the framework handles the detection logic internally, placing reactive elements into an existing map is direct. Designers can drop text render actors onto walls or place decal actors over floor tiles, configure their base properties, and immediately test them against placed or carried UV emitters without writing complex custom shaders from scratch.

Telekinetic Abilities Compatibility and Practical Application

The pack is compatible with Telekinetic Abilities, introducing unique possibilities for environmental interaction. When telekinesis systems allow players to lift, aim, or carry objects remotely, pairing those mechanics with UV emitters expands investigative gameplay. A player can lift a detached UV light source with telekinesis to sweep high ceilings, reach behind security grates, or cast light across distant walls that would otherwise remain out of reach.

Conversely, objects carrying reactive text renders or decals can be manipulated telekinetically. Players can move a concealed puzzle piece through a stationary UV beam in the room to read its markings, or reorient reactive props to line up fragmented decal clues spread across multiple objects. This cross-compatibility connects puzzle design directly with mechanics-driven character interactions, making discovery an active, spatial task rather than a passive inspection.

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