scales.ts

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`7cc177f6` 2026-09-07 Pavel Safronov	1	/**
	2	* Slider mappings shared by the panel and the views.
	3	*
	4	* This lives outside views/ on purpose: the panel needs the eye-height scale to
	5	* label its slider before the interior view exists, and importing the view for it
	6	* would statically pull Three.js into the entry chunk — the exact regression
	7	* D-021 fixed for the exterior.
	8	*/
	9
	10	/** Standing eye height. */
	11	export const EYE_MIN_M = 1.7
	12	/** High enough to be a fifth of the way to the axis, and see the world as a tube. */
	13	export const EYE_MAX_M = 25_000
	14
	15	/** Eye height from a 0..1 slider position. Logarithmic, so 1.7 m is reachable. */
	16	export const eyeHeightFromSlider = (v: number): number =>
	17	EYE_MIN_M * (EYE_MAX_M / EYE_MIN_M) ** Math.min(1, Math.max(0, v))
	18
	19	export const sliderFromEyeHeight = (h: number): number =>
	20	Math.log(Math.max(EYE_MIN_M, h) / EYE_MIN_M) / Math.log(EYE_MAX_M / EYE_MIN_M)