Gap between a Curve and a Surface(Distance) command evaluates gaps between a curve and a surface. Discrete points on a curve are selected to get the closest point to a surface. Then if the distance is less than a threshold, the distance values are depicted on the screen.
For the prompt
"Specify a curve"
, select a curve to evaluate.
For the prompt
"Specify a surface"
, select a surface to evaluate.
On the surface selection, the command will evaluate the gaps and dipicts the distance values and lines that connect the closest points.