Formula to use an individual point from a curve for a dimension?

[[Mi...]]

We use trigger points for our curves instead of scanning, would like to use certain points in the curve to measure to other features or datum's. So if I have 50 points I want point 20 actual location in Z to measure to a plane not associated with the curve alignment.

I know with patterns you can pick an individual point or feature [ex. Point Top (*) where if I want the second point of the pattern I would enter Point Top(2) instead of the asterisk ]

 

[[To...]]

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I know this is not a formula but you can create a point feature, select recall feature points, then right-click on the curve and select Add Range Limits.   Click the Point button and enter the point number.

 

Edited November 22, 2024

[[To...]]

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[[Mi...]]

Just a follow up, I needed to use this today and it worked just fine, thanks

[[Iv...]]

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A little late, but there is a formula to get this done.

It would become a little tedious, since you would likely need to apply a formula to each line of the feature. The formula is listed below. The first entry is the curve name, followed by the desired coordinate, and finally the point number. In bold, I added an example of how your formula might look. 

getActualCurvePointCoord( 'curve/curve form/line profile', 'X' [,loop index],point number )

getActualCurvePointCoord("2D Curve", "Z", 20)

You could then pull the nominal using the "getNominalCurvePointCoord( )" function, which works identically to the getActual version. 

That being said, I think

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 solution would be my preferred option if I were looking to recall a single point. 

The formula is more powerful. I used it to output the curve points into a point feature. I then looped the feature so I could access all the points. 

The last step would be to add a loop to your characteristic. This can be done by right-clicking the characteristic. 

[[Iv...]]

I'm not sure how sure your curve looks, but you might also want to consider the min/max coordinate under construction. If you were looking for the peak or valley coordinate, this is a better option. Especially, if you decided to scan your curve instead of using single points. Using a static point would be risky since the high/low point could vary from part to part. The min/max coordinate is dynamic, so it would pull whatever point value was lower/higher in the desired axis. 

You could also enter an alignment to account for any rotation in the curve.