probed points of a cross-section

[Firefly]

Hi PW-Users,

using the 'probing cross-section' I got two problems:

1: during probing you miss a area, going back to the part the cs follows the sequence of points, so the result is a weired cs
2: probing the cs you have no chance to get the original points, e.g. for changing the projection distance onto the cutting plane or to make a alignment using the cs points (as data points)

My solution 1:
- create a polyline from the probed cs
- export the points of the line to a text file
- import the text file as data
- extract the data normals
- update the cs

Using a macro for it you can probe additional areas.

Perhaps someone with another idea for problem 2? Because now I use the points projected onto the cs plane, it would be perfect to use the probed points, compensated but not projected...

[Admin]

Sorry Firefly, I don't do much probing... maybe someone else can shed some light on your problem.

[Firefly]

No reason to apologize ;)

Normally I also use cross-sections on scanned pointclouds. But sometimes accuracy is not enough with the scanner, so probing is the only way...

[PW User]

Hello,

The probed points are not kept in the data branch, unfortunately.

Your proposed workaround is very interesting, two thumbs up!

Only one thing I can think of: probe a compensated point cloud in the area of the cross section and then use the standard cross section tool on point clouds.

Note that the density of points on a probed point cloud is not as high (typically) as a laser or other type of scanner. It may be necessary to tweak the cross sectionning tool by using a parameter in the config of Polyworks to allow projections to the plane with lower density. the parameter is set in the iminspect.config file of your .innovmetric folder (see the options in the workspace manager to find where your .innovmetric folder is). the option is:
CROSS_SEC_PT_ON_PLN_TRSHLD

The default value (in the iminspect.windefault file in the installation directory) is set at 0.05. It is defined as "Percent of distance to the sectionning plane for which point are directly projected to the plane".

If you increase that value to 0.5 and your projection distance is set to 1mm, your points will directly get projected to the sectionning plane. Otherwise, a point on either side of the sectionning plane is necessary.

I hope this helps a little.

[Firefly]

Manipulating the secret settings - sounds like fun  ;D

I will test it asap, thx for the hint!