# The continuity changes!

I have a strange problem! I have a symmetric surface, I do the smoothing curve and I reflect her from the center, I had G3, I have received G2. Why?

1.3dm (49.8 KB)

Dear Modeler3d
how did you analyse â€śG2â€ť ? with the _gCon command ?
the _gCon command does only work for G0 and G1 and G2. It will not distinguish between G2 and G2+ / G3 / G4â€¦
_mirrow the curves with copy option and check _crvDeviation.
it is somewher e-13 - accurate as expected.
hope that helps
merry chrismas
best
tom

1 Like

I have understood. Thank you very much!

At me anyway writes â€śCurves donâ€™t overlapâ€ť - it is normal?

If to cut off surfaces, then everything changesâ€¦
After reflection from G2 the continuity of G1 turns out (if not to cut, then G2 is made of G2). Help!

1.3dm (75.4 KB)

check the documentation for _crvDeviation.
it is to compare to similar curves for their minimum / maximum deviation.
if you want to check, wether a curve is symmetric, you can mirrow (option copy yes) a curve and compare it to the offspring curve. if deviation is below your documents tolerance, you can accept the curve as symmetric.
best
t

Now I understand the tool
But a strange situation in my previous postâ€¦

It becomes even more unclear when I reflect the right part concerning the center of all surface and I check continuity

Why so?

Hello - hmmm - I donâ€™t knowâ€¦ my guess of the moment is that `GCon` is looking at some numbers that are right on the edge - hereâ€™s what I see from `GCon` with more precise numbers:

Left:

Curve end difference = 0
Radius of curvature difference = 5.0068613752785041e-05
Curvature direction difference in degrees = 1.7075472925031877e-06
Tangent difference in degrees = 1.4787793334710982e-06
Curves are G1.

Right:

Curve end difference = 0
Radius of curvature difference = 1.4210854715202004e-14
Curvature direction difference in degrees = 0
Tangent difference in degrees = 8.5377364625159387e-07
Curves are G2.

Left after `Match`:

Curve end difference = 0
Radius of curvature difference = 9.2370555648813024e-14
Curvature direction difference in degrees = 8.5377364625159387e-07
Tangent difference in degrees = 0
Curves are G2.

-Pascal

Well same not the decision - time curves identical - G2 has to be at both curves without any manipulations. Or I havenâ€™t understood you?