Function trilerp 

pub fn trilerp<T: Float>(
    f000: T,
    f100: T,
    f010: T,
    f110: T,
    f001: T,
    f101: T,
    f011: T,
    f111: T,
    tx: T,
    ty: T,
    tz: T,
) -> T

Computes trilinear interpolation.