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02-10-2018 05:18 AM - edited 02-10-2018 05:27 AM

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:

- linear extension of the edge
- project the extended line to Face_A
- linear extension of the projected curve
- 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.

Solved! Go to Solution.

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2 REPLIES

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02-10-2018 05:34 AM

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

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02-10-2018 09:11 AM

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!

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