FrustumLens
data class FrustumLens<T : Number, Comparable<T>>(val left: T, val right: T = -left, val bottom: T, val top: T = -bottom, val near: T, val far: T, val type: KClass<T>) : Lens<T>
A lens for a perspective projection defined by a given frustum.
The frustum is defined by its near and far depth clipping planes, and its left, right, bottom and top clipping planes (specified at the near depth).