2019 R2 hasn't fixed THIS yet...... :mad:

Hi Sealevel, This should be an Offline issue only for 2D Profile. This does not affect Online measurement. Please see below for an explanation of Offline behavior:

For offline, all the measured points are simulated points, simulated points are calculated from our Nominal Form code used for target generation. Our Nominal Form code only contains lines and circles(arcs), it doesn’t support generic curves, so for circle and line vision features you don’t see the issue in offline as the nominal form is only using the line or circle, so the simulated points are on the feature.

For 2D profile, we have to handle generic curves, we decided to use only line sections for 2D Profile nominal form. 2D Profile contains a series of cad elements, if a cad element is a line, we add one line section into Nominal Form. If a cad element is a polyline, we add a number of lines into it. If a cad element is any other type, code will break it down to a series of lines. It will not be exactly on the feature. Because the offline simulation points are generated from Nominal Form, you see it the way you have shown above.
Online we measure the points on the edge, so there is no problem. All measured points are either simulated points (offline) or edge points (online), then we do a cad drop to cad elements to get their respective theo points.

I hope this clears this up. If you have any further questions, please contact me at neil.ryan@hexagon.com

Cheers

Neil

Hi Sealevel, This should be an Offline issue only for 2D Profile. This does not affect Online measurement. Please see below for an explanation of Offline behavior:

For offline, all the measured points are simulated points, simulated points are calculated from our Nominal Form code used for target generation. Our Nominal Form code only contains lines and circles(arcs), it doesn’t support generic curves, so for circle and line vision features you don’t see the issue in offline as the nominal form is only using the line or circle, so the simulated points are on the feature.

For 2D profile, we have to handle generic curves, we decided to use only line sections for 2D Profile nominal form. 2D Profile contains a series of cad elements, if a cad element is a line, we add one line section into Nominal Form. If a cad element is a polyline, we add a number of lines into it. If a cad element is any other type, code will break it down to a series of lines. It will not be exactly on the feature. Because the offline simulation points are generated from Nominal Form, you see it the way you have shown above.
Online we measure the points on the edge, so there is no problem. All measured points are either simulated points (offline) or edge points (online), then we do a cad drop to cad elements to get their respective theo points.

I hope this clears this up. If you have any further questions, please contact me at neil.ryan@hexagon.com

Cheers

Neil