Function nearPlaneFloor

nearPlaneFloor(
    expandedRadius: number,
    far: number,
    boundNearFarRatio?: boolean,
): number
The near-plane floor both clipping paths clamp to: the scale-aware backstop, raised to whatever far / {@link MAX_NEAR_FAR_RATIO} demands for depth-buffer precision.

Scale-invariant by construction — the bound is derived from far, which is itself scene-scaled — so it keeps the tiny-scene guarantee minNearForRadius was introduced for (#573) without the Z-precision cost: on a diagonal-0.1 scene at maximum zoom-in, far / 1200 is ~4.4e-5 while the closest reachable orbit distance is ~1.7e-4, so nearby geometry still renders.

Always < far for far > 0, so callers can rely on it never producing an inverted frustum on its own.
Parameters
- expandedRadius: number
  Safety-expanded bounding-sphere radius.
- far: number
  The far plane the caller is about to apply.
- boundNearFarRatio: boolean = true
  Whether to apply the depth-precision ratio bound. TRUE for a perspective projection (where depth resolution is ~1/near); FALSE for an orthographic one, whose depth is linear in eye space, so the bound would clip a visible near slab for zero precision gain — see MAX_NEAR_FAR_RATIO. Callers derive it from the live camera rather than assuming, because the viewer swaps projections at runtime (V key).
Returns number
- Defined in src/scene/scene-manager/clipping/bounds-math.ts:336