V5 curvature analysis

[jackk]

When analyzing a curve or surface in V5 with the curve or surface connect checker, curvature is expressed as a percentage. Does anyone know what the percentage is? Why is it a maximum of 200%? The documentation on this is not very clear.

 

[JuhaEdag]

Hi Jack.
According to the online documentation the maximum error if you can't achieve G2 continuity is 2 and if expressed in percentage 200 %.

 

[jackk]

2 what? inches, degrees, gigabits????

curvature is normally designated as a radius length, so I don't understand the maximum error of 2 or 200%

my guess is it's a ratio between the two curvatures. If one curvature is more than twice as large (small?) as the other, than CATIA indicates a maximum (worst case) situation. But, if the curvatures are the same, then there is a ratio of 1:1 (100%).

Can any mathmaticians or surfacing experts explain how CATIA is calculating this?

 

[itsmyjob]

from the online doc I found that this value is :

|C1-C2| / ( |C1+C2| / 2 ) no unit a ratio

When curvature have same orientation it works well, but when inverted then result is 200% no matter what. (Which i think is not good.)

Eric N.

catiav5@softhome.net

 

[jackk]

thanks Eric for explaining that.

haven't heard from you for awhile - you been on vacation?