Function thickness_of_shape 

pub fn thickness_of_shape(
    model: &Model,
    shape: &Shape,
    points: &[Point],
    normals: &[Vector],
    options: &Thickness,
) -> OgeomResult<Vec<Option<f64>>>

The wall thickness at each point of shape, a solid or a shell, measured into the material against the point’s outward normal on the faces’ own surfaces; in the points’ order, None where it is thicker than Thickness::max or the inward ray leaves the shape without meeting a face.

A ray meets a face where it crosses the face’s surface inside its trim, or within the band of the trimming rings drawn at ten thousand times the confusion distance, as classify_in_solid_exact draws them. A sphere’s nearest surface is to_shape’s nearest point, among the faces, edges and vertices not within the facing limit of edge-on to the point’s normal. See the module for the rest.

A point that is not finite, or whose normal has no direction, answers None.

Errors

As Thickness::check; OgeomError::Dimension if there is not one normal per point; OgeomError::Construction if the shape is not a solid, a shell or a compound of solids; and as the intersections and projections report.