HUD elements occupy the visual field

What it is

Every HUD element (health bar, minimap, quest list, ability bar) occupies physical screen area, and screen area is a zero-sum resource—area given to the interface is area taken from the game world. Visual field cost is the first constraint of HUD design: not a boolean "does it block" question, but how much area each element consumes, where, and with how much salience, continuously.

Why it happens

Occupancy costs flow through three channels. Attention: persistently visible HUD elements get registered by the visual system even when not actively read (preattentive processing); every element is a standing tenant of attention—the more elements, the less attention left for the game world. Perception: HUD area directly reduces the screen region available for observing environmental detail; edge HUDs compress effective field of view (hitting hardest in games relying on peripheral threat detection), and a corner minimap obscures that direction's environment. Aesthetics: large HUD area frames the game world behind interface chrome, weakening immersion's "transparency." The cost is not uniform—central-vision occupancy costs far more than peripheral (the centre is the fine-detail zone), and occupancy over movement areas interferes with target tracking. That non-uniformity is where HUD layout optimisation lives.

Where it stops holding

Occupancy is not "less is always better"—HUD's value (information access) trades against its cost, and a fully deleted "immersion mode" means most players frequently open pause menus to check status (occupancy converted into time cost). HUD area budgets differ by genre: competitive shooters have high information demands (minimap, teammate status, and ammo are all decision inputs), making 15-25% screen occupancy a reasonable price; narrative adventures need less, compressing HUD below 5%. Occupancy cost also varies with display: a phone's total area is small, so the same HUD proportion squeezes the world harder; on a TV viewed from distance, edge HUDs consume fewer visual degrees. UI scaling options (whole-HUD scaling) hand the occupancy-legibility trade-off to players—different visual acuities have different optima.

Applying it

• Quantify the current HUD's area occupancy (sum of element bounding boxes ÷ screen area) and set a budget per genre (e.g., competitive ≤ 20%, narrative ≤ 8%).
• When over budget, rank elements by "decision contribution ÷ occupied area" and demote low-contributing persistent elements to on-demand or edge placement.
• Verification: capture screenshots with full versus reduced HUD and measure players' detection rate for key environmental information (enemy positions, path cues). Higher detection with the reduced HUD proves the current HUD's occupancy cost is too high.

Related

• Same group: W5.07.2 Information should appear and fade with the current phase · W5.07.3 Immersion and information completeness trade off
• Nearby: W5.01 Heads-up displays and information layout · F1.01 Interface information density · A5.02 Visual attention allocation
• Search terms: HUD footprint · screen real estate · interface density · minimal HUD