Hi rhino community, i have a question for you.

Why are there **2 numbers** when verifying curvature continuity of 2 surfaces? what do they correspond to?

Thank you !

Hi Enzo - from Help:

##### Curvature

Evaluates curvature deviation between the selected edge pair.

This option displays absolute and relative (in parentheses) deviations.

- Absolute curvature deviation = (1/Radius1)-(1/Radius2)
- Relative curvature deviation = (Radius1-Radius2)/(Radius1+Radius2)

-Pascal

Thank you Pascal !

And what number should i aim to have nice continuous reflexions ? Absolute : 0 and relative :1 ?

If Radius 1 equals Radius 2 then the relative curvature difference = 0 and absolute curvature difference = 0.

However if Radius1 is infinite (Curvature1 = 0, ie â€śflatâ€ť) and Radius2 is infinite (Curvature2 = 0, ie â€śflatâ€ť then relative curvature difference is undefined. However Rhino returns a value of 1 even though the curvatures match.

What is needed to be satisfactory for the intended application. Exact matching will look good, but in many instances less than exact will be satisfactory.