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# angle between a curve and a surface

Genius

I'm looing for an efficient way to confirm the tangency between a curve and a surface. As tought by @TimF in a previous post, this is key for the success of Thru Curve Mesh.

Below is a simplified model. The four edges of the Green face are all tangent to the neighbouring faces. Now let me try to measure the angle between the highlighted edge and Face_A.

Method 1

At first, I simply use "Simple Angle" to measure the angle between the edge and the face. The result "113.3380°" is apparently not what I expect (180°).

Method 2

Then I try to do it step by step:

1. linear extension of the edge
2. project the extended line to Face_A
3. linear extension of the projected curve
4. measure the angle between the two extend lines
• The result "0.000014°" is OK.

I wonder whether there is a better way to measure the angle between the curve and the face or simply to test their tangency. Thanks!

I tried "Deviation Checking" > "Edge to Face", but was confused about how it works. Official documentation provides very limited information about the command.

2 REPLIES

# Re: angle between a curve and a surface

Siemens Phenom

Datum Plane, select along edge of green surface. Change location on curve to 100% and cycle orientation on curve to be binormal to path.

Intersect curve between surface a and plane.

measure anglbe between edge and curve.

Steve V

# Re: angle between a curve and a surface

Genius

Hi @StevenVickers  Thanks!

Your solution based on binormal plane should be the right method to do the job.

My method based on linear extension and projection should be wrong!