pub fn plan_boundary_distance(
a: &ExactBRep,
b: &ExactBRep,
accuracy: Scalar,
tolerance: Tolerance,
) -> Result<DistanceBounds, ExactMeasureError>Expand description
Distance between the plan projections of a and b – their shadows
on the XY plane – to within accuracy (#217).
A solid’s shadow is its boundary’s: a vertical line through a point of
the solid meets the boundary. So this is the least horizontal distance
between two boundary points, found by the same certified search as
boundary_distance with horizontal gaps, directions and enclosing
discs. It is zero when the shadows overlap, and unlike the distance in
space it is zero for a body standing inside another’s footprint.
point_a and point_b lie within rounding of the boundaries, their
projections at most upper apart. When two planar faces show the
shadows overlap over a patch of positive area, the interval is [0, 0]
and the points project into that patch (see plan_overlap).