CAN I USE POINTCLOUD THIS WAY?

When you are constructing a circle out of the scans, what error are you getting that is not allowing you to construct them together? Are you using the "Select All Hits" button during construction, and in the correct workplane if doing 2D constructions? I only have experience constructing features from a COP from laser scanning, but I don't see why creating a COP and then using it to construct would not be okay. Since it's created out of the same hits. Does your COP hits count add up to the amount 3 circle scans would have?

this is the error I'm receiving

Neil DeGrasse Tyson? I have his number but he said quit calling him.

BFRE is 100% the most common thing Neil tells us that we should do. In my brain, if they didn't want me using BF it wouldn't be in the dropdown! Or they would make both BF and BFRE calculate the same as BFRE to trick us.

I'm gonna need one of those too

Or God-forbid make it the default choice so you do it without thinking. 

BFRE when you have "surface information", BF all other times.

"surface information" = a measured feature

...if I understood Neil correctly.

Seems kinda silly not to have it as default since the sole purpose of the machine is to gather measured features.

So the way I am taking that is, if I have intersect/pierce points that I am using to Construct a circle feature, I would use BF instead of BFRE because they aren't explicitly measured features, but generated from measured features. Does that sound right?

With our powers combined maybe we can summon the great and mighty Neil! 

But yes, that does make sense, but then would it be "wrong" to use a BFRE for those, would it matter, is there any difference in the measurement? Also, what if you are making something else with the pierce point? 

I believe that BF uses the vector of the points as measured, and BFRE recalculates the points and fit based on the point centroid location with no vectors considered. This is for situations like measuring a feature where you're not probing normal to the surface. 

This is correct - best fit uses the measured points, if you have cosine error on the points this will get passed over into the constructed feature.

BFRE use the tip centre (uncompensated point) - and calculates the feature as if all the hits were measured as one.

In the image below four points are measured (with large cosine error) resulting in the four points (blue dots) the BF constructed (blue) circle is inaccurate.

Using BFRE the hits are recompensated resulting in the four hits (yellow dots) and the constructed circle measure accurately.

This is correct - best fit uses the measured points, if you have cosine error on the points this will get passed over into the constructed feature.

BFRE use the tip centre (uncompensated point) - and calculates the feature as if all the hits were measured as one.

In the image below four points are measured (with large cosine error) resulting in the four points (blue dots) the BF constructed (blue) circle is inaccurate.

Using BFRE the hits are recompensated resulting in the four hits (yellow dots) and the constructed circle measure accurately.

Good Pic.