CesiumScale

CesiumScale.ts

const clamp = (val: number, min = 0, max = 1) => {
  return val > min ? val > max ? max : val : min
}

export const getCesiumScale = (distanceToCamera: number, nearFarScalar: NearFarScalar) => {
  const nearScalar = nearFarScalar.nearValue
  const farScalar = nearFarScalar.farValue
  const nearDistance = nearFarScalar.near
  const farDistance = nearFarScalar.far

  let t = (distanceToCamera ** 2 - nearDistance ** 2) / (farDistance ** 2 - nearDistance ** 2)
  t = Math.pow(
    clamp(t),
    0.2,
  )
  const cesiumScale = nearScalar * (1 - t) + farScalar * t
  return cesiumScale
}