Function display_chord_tolerance 

pub fn display_chord_tolerance(solid: &BrepSolid, lod_factor: f64) -> f64

The app’s display chord tolerance (BetterSolid._kernelTessellationOptions): vertex |coord| extent — falling back to the control-point hull / sqrt(2) for vertex-free solids (full spheres/tori) — times 1.5e-3, times the render-LOD factor (1.0 = the app’s “Normal” preset).