Function computeDimensionStep

computeDimensionStep(
    direction: -1 | 1,
    selectedDimension: number,
    dims: SimpleDims | null | undefined,
    dimensionRanges: readonly (readonly [number, number])[] | null | undefined,
    getStepOverride?: (dimIndex: number) => number | null,
): DimensionStepResult | null
Compute the next dimension-navigation step given the current dim state. Returns null when navigation cannot proceed (no dims, no ranges, no navigable dimensions, or a stale selected-dimension slot).

The changed threshold is a step-relative epsilon (snapStep * 1e-9, matching SceneDimsManager) so a sub-micro-unit grid is still navigable; the intent is unchanged from the inline original — pure arithmetic identity isn't required, only "movement big enough that the spatial-index loader will requery."
Parameters
- direction: -1 | 1
- selectedDimension: number
- dims: SimpleDims | null | undefined
- dimensionRanges: readonly (readonly [number, number])[] | null | undefined
- OptionalgetStepOverride: (dimIndex: number) => number | null
Returns DimensionStepResult | null
- Defined in src/input/input-handler/dimension-navigation/compute-step.ts:50