Scroll-Triggered GLB Model Carousel — Free GSAP ScrollTrigger + Three.js Gallery Snippet

Build a "scroll-triggered multi-model 3D carousel" in plain HTML, CSS, and JavaScript using Three.js (core, GLTFLoader, and OrbitControls, all loaded from a CDN with no bundler) plus GSAP with its ScrollTrigger plugin.

Requirements:
- A pinned full-viewport Three.js scene (GSAP ScrollTrigger pin: true) with an intro section before it and an outro section after, studio-lit with at least a key and fill light plus a simple ground/grounding element.
- Define a gallery of at least three real .glb models as plain data (name, URL, a fallback color), each pointed at a genuine, freely-licensed, CDN-hosted glTF binary URL (e.g. different Khronos glTF-Sample-Assets models) — do not substitute primitive geometry for any of them.
- Create one shared parent "turntable" Group, and inside it, one child Group per gallery entry ("slot"), positioned evenly around a circle so each model sits in its own fixed position relative to the turntable's center. Load each gallery entry's model into its own slot using THREE.GLTFLoader, and after each one loads, measure its bounding box and scale it to the same fixed target height (rather than a hardcoded scale number) so every model in the gallery compares fairly at a consistent visual size.
- Using ScrollTrigger's scrub option, rotate only the shared parent turntable group's own rotation directly from scroll progress — mapped so that each full model-to-model transition corresponds to an even fraction of the total scroll range — never toggle any individual model's visibility, reparent anything, or reload a model when scrolling back to one already seen. The rotation must be a pure, reversible function of scroll position.
- Display a live text label showing the name of whichever model is currently closest to facing the camera, and a row of dot indicators that highlights the currently-active model, both derived from the same scroll progress value used for the turntable rotation.
- Set up OrbitControls on the camera with damping enabled so a visitor can click-and-drag the canvas at any time to orbit around whichever model currently faces the camera — this must work continuously and simultaneously with the scroll-driven turntable rotation, with zero explicit conflict-resolution code, since OrbitControls only ever moves the camera while scroll only ever rotates the turntable group.
- Turn off OrbitControls' own wheel-zoom and instead implement zoom as an explicit opt-in gesture: a vertical range-input slider next to the canvas, plus Ctrl/Cmd + scroll wheel — a plain scroll must do nothing and pass through to the page normally.
- Handle each model's own GLTFLoader error callback independently by logging which gallery entry failed and substituting a simple placeholder mesh into that specific slot only, so a single broken model URL never affects the other slots on the turntable.