Coaster Empire 3D

Cinevva's analyzer read this game's design doc and its source, then wrote the brief below. "Make your own" hands it to the game creator as your opening message, so you start from a real spec rather than a one-line idea.

Create a browser-based 3D amusement-park coaster editor titled “Coaster Empire 3D.” Use Three.js-style real-time 3D rendering with a perspective camera, orbit camera controls (drag to orbit, wheel to zoom), soft shadows, fog, and a bright stylized low-poly park. The scene should have a large flat green ground plane, a pale gray circular plaza in the center, a tan straight path extending from the plaza, a few scattered large trees and a bench, and a simple coaster station at the left side: a dark blue rectangular base, yellow/orange flat roof, and two pale support posts. Start with a visible suspended pink/red coaster made from five editable sections arranged left-to-right around y=2–5: a straight section, a medium hill rising to roughly 6m, a quarter banked turn, a loop, and another straight. The track should be pink/red with a slightly metallic appearance, supported by repeated narrow dark gray vertical support columns down to the ground; add supports automatically whenever track changes.

The main mechanic is constructing and editing a coaster from modular track pieces. Clicking a track section selects it and highlights it cyan/blue; show its name and type in a right-side inspector. Provide build buttons for TRACK (straight), HILL (medium hill), TURN (banked turn), and LOOP, plus EXTEND (adds a straight section from the selected section), DUPLICATE (copies the selected piece nearby), DELETE, UNDO, and REDO. New pieces should appear near the current end of the coaster, cost 
20 in career mode, and update supports. The geometry options and inspector should support these types: Straight, Short Straight, Medium Hill, Banked Turn, Loop, Corkscrew, Brake Run, and Launch Track. Straight pieces are short rectangular rail-like track sections; short straight is shorter; medium hill is a tube following a smooth rise-and-fall curve; loop is a vertical circular loop; banked turn is a curved quarter-turn; corkscrew is a partial twist/torus-like curve. It is acceptable for the latter options to use simple stylized procedural geometry matching the visible modular track style.

The selected-section inspector must show the selected section name/type, a track-type dropdown, rotate left/right by 15 degrees, Bank minus/plus controls, exact numeric yaw and bank fields, APPLY and RESET buttons, and readouts for height, yaw/bank, and estimated speed. Track transformations should update the selection and support columns. Include click selection by raycasting against track geometry, Escape to deselect, and Delete as a keyboard shortcut.

Include a dark navy glass-like HUD over the 3D scene. At top left show the title in a blue gradient rounded panel. At top right show four stat cards: Budget initially 
2,500, Park rating initially 72, Guests initially 18, and Weather initially Clear. Place a hint centered near the top: “Click a track piece to edit it • Drag to orbit • Wheel to zoom.” On the left, show the rounded Build Tools and Park panels. Park controls must include OPEN, CLOSE, WEATHER, NIGHT, IMPLODE, and SAVE. OPEN should mark the ride open, add 4 guests, add 
80, and increase rating by 1; while open and not testing, guests can gradually rise up to 60 and money can increment slowly. CLOSE should mark it closed. WEATHER cycles through Clear, Cloudy, and Rain and changes fog color; NIGHT toggles a dark blue night background, fog, and reduced lighting. IMPLODE should ask for confirmation, play a short visible implosion animation where coaster pieces rise, rotate, shrink, and then clear the coaster and supports. SAVE stores park state locally in the browser.

Add a bottom centered navigation bar with CAREER, SANDBOX, BLUEPRINTS, and PARK MGMT. CAREER restores the 
2,500 budget and 72 rating; SANDBOX sets effectively unlimited money ($999,999); BLUEPRINTS saves the current track layout locally; PARK MGMT displays a management toast including ticket price based on rating and operating cost based on number of pieces. Use toast notifications for actions such as adding, deleting, changing weather, opening/closing, saving, and undo/redo.

Include a green TEST RIDE button. Test ride toggles a special mode, disables orbit controls, hides the normal hint, and displays a top-center “TEST RIDE MODE” HUD with dynamic SPEED in km/h, HEIGHT in meters, and G-FORCE. The visible implementation may use a cinematic camera that smoothly moves around the coaster rather than physically following the rails; calculate visibly changing values over time. In test mode, T exits, Space pauses/resumes, and R restarts the test timer. Keep the scene and UI responsive, with compact panels and horizontal scrolling/stacking behavior on smaller screens.

Art direction: polished dark navy management-game interface with thin blue borders, rounded panels, amber stat accents, green success buttons, red destructive buttons, and a clean sans-serif font. The 3D world should be colorful, simple, and softly lit: cyan-blue sky in daytime, green ground, pale plaza/path, pink/red coaster rails, golden/yellow accent roof, and blue-gray structural supports. Keep the camera angled down in an elevated three-quarter view so the entire compact park and coaster are visible behind the HUD.