Networksrf "Unable to use curve network"


#1

When I get the error “unable to use curve network,” I usually just keep trying different curves until I find one that works, but I really like this curve network. What is usually the reason for getting this error? Just trying to figure out how to best use this command.


(Pascal Golay) #2

Hi Christine - the network must be able to be resolved into a rectangular grid, i.e. in exactly two directions - so, curves cannot be strung together end to end as separate curves, curves cannot cross one another more than once, curves going in one direction cannot cross curves going in the same direction.

-Pascal


#3

Thanks for that image! What’s the difference between the curve network on the top left and bottom left?


(Pascal Golay) #4

Hi Christine - the green and cyan curves are separate curves, end to end - that does not work. I guess I could have used more contrasting colors there…

-Pascal


#5

Oh, thanks. That makes sense, but I still can’t figure out why I can’t use this curve network?


(David Cockey) #6

NetworkSrf requires:
ALL the curves in one direction must cross ALL of the curves in the other direction
None of the curves in each direction can cross any of the curves in the same direction

The above will only be true if the curve on the left edge is actually two curves with the split between the curves near the red line I added to the illustration. However if that is true the resulting surface is likely to be less than good. A better strategy for that shape may be to create two surfaces rather than one. Post the curves and you design intent and someone may provide a suggestion as to how to proceed.


(Pascal Golay) #7

Hi Christine - I’d reinforce David’s comment - you should think about making this some other way - it is asking a lot of NetworkSrf to make what you want here, I would say, let a lone making it well. Can you post the curves?

-Pascal