The **simplicial-complex-contour** library implements the marching‑simplex algorithm to extract a piecewise‑linear isocontour (or isosurface) from a scalar field defined on a simplicial mesh. It takes mesh cells, per‑vertex values, and an optional level, and returns the contour’s edges together with interpolation weights, making it useful for developers and researchers who need fast contour extraction on 3‑D triangle meshes (e.g., geometry processing, scientific visualization).