Linear Interpolation

For a single value, with extremes V0 & V1 and interpolation fraction A:

    V = (1 - A) * V0 + A * V1

For multiple values, such as XYZ position, use the same fraction A for all:

    X = (1 - A) * X0 + A * X1
    Y = (1 - A) * Y0 + A * Y1
    Z = (1 - A) * Z0 + A * Z1