Steel beams in three.js built from the same data as a supplier's weight calculator

A website template for steel suppliers, called Ironline, uses the same section data for its weight calculator and its 3D beam renderings. Rolled sections such as IPE, HEA and UPN use standard table weights, while other profiles have their weight computed from geometry at 7.85 kg/dm³. Each cross-section is stored as plain outline data, which is extruded into a 3D shape in three.js with a small bevel for edge highlights. The same outline data also generates SVG path drawings of the cross-sections, so the 3D view and the dimensioned drawings match the calculator.