# Gap between a Curve and a Surface(Angle)

[Gap between a Curve and a Surface(Angle)] command evaluates the folding angle at boundary point of a curve and a surface. First, find the shortest deviation points of a curves end point and an edge of the surface. Then evaluates the angle between the curve tangent vector and the surface normal vector.

## Step 1

For the prompt"Specify a curve.", select a curve element to measure.

## Step 2

For the prompt "Specify a surface", select a surface element to measure.

When selection is done, evaluation will be done. The evaluation result will be shown in the output window. Each line means:

Position on curve

  Evaluated point on the curve.

Position on surface

  Evaluated point on the surface.

Deviation

  The above 2 points distance.

Curve Direction

  Curve tangent vector at the position on the curve.

Surface Normal

  Normal vector at the position on the surface.

Angle

  The angles of the above two vectors.

Vector product

  Vector product of the above two vectors.