This uniform b-spline is the same one used often as a "Gaussian" approximation (three box filters) - see Paul Heckbert's 1986 paper here (apparently done at NYI

This uniform b-spline is the same one used often as a "Gaussian" approximation (three box filters) - see Paul Heckbert's 1986 paper here (apparently done at NYIT in the early 1980s with help from Ken Perlin): https://dl.acm.org/doi/pdf/10.1145/15886.15921 https://dl.acm.org/doi/pdf/10.1145/15886.15921