Function pick_filtered 

pub fn pick_filtered(
    scene: &RenderScene,
    camera: &ViewCamera,
    x: f64,
    y: f64,
    options: &PickOptions,
    filter: &[String],
) -> Option<PickCandidate>

The nearest hit of an ALLOWED KIND under CSS-pixel (x, y), using the same ranking as pick. filter is a set of kind strings ("SOLID", "FACE", "EDGE", "VERTEX", case-insensitive); an empty filter means any kind. This is the type-constrained pick the reference-selection widget uses so a targetSolid field resolves the SOLID under the cursor (candidates rank faces first, then the trailing SOLID entry — find walks that order and returns the first candidate whose kind is allowed). Returns the full candidate (name + owning solid + position) or None on a miss.