Curvature continuity problems

[SW]

I'm having a lot of trouble with what I originally thought should have been a relatively straightforward problem. I'm trying to create the following surface with curvature-continuous transitions. However, as you can see, the result is far from ideal.



I'm using three separate style features, a trimmed upper and lower surface, and a side surface that should blend between the two. The upper and lower surfaces almost seem to work, but even though I've added a curvature constraint to the curves, I can't seem to add a curvature constraint between the surfaces. The reflection map is not too bad though.

For the side surfaces, I can maintain curvature between the the side and upper or lower surface, but not between the each portion of the side surface.

I've also tried to use a Variable Section Sweep instead of the style for the side surface, but not had much success.

I've uploaded the part here:
ontinuous_080926ag.prt.62.zip

Any help would be appreciated,

Sam

Edited by: SW

 

[michael3130]

what version of proE are you using?

 

[SW]

I'm using Wildfire 4.

Sam

 

[mgnt8]

I don't have AAX so is appears that I can't edit your file, but I do notice that you have wrinkles close to the boundaries of your side_surface_style. It lookes like it should be an otherwise straightforward 4sided boundary situation. Just another thought - if its possible to combine your 3 style features into 1, it would be pretty awesome if you could connect them together using the edit surface feature. have you tried it?



Edited by: mgnt8

 

[SW]

Thanks for the replies.

I thought it should be straightforward too.

Mgnt8, are you referring to the wrinkles between the side surface and the upper and lower surfaces? I should be able to smooth these out a bit but it doesn't solve the problem completely. Also, I'm not too sure what command you are referring to with the "edit surface feature". Do you mean the new "Surface Edit" within the Style module of Wildfire 4?

Cheers,

Sam

 

[Jacoolo]

I noticed - specialy at the rear side - patches do not look right



As long as I am not equiped with ISDX I can only assume what real cause of the problem is... however I met such problem before trying to create surface by Boundary blend between curves with a very different curvature plot(radius) i.e conic arc(rh 0.7) - simple arc.

Following approach worked for me quite well - main sufr as VSS + extra "rounds" as BB



It is noticeable on pic above that the side surface profile consist of three main element - rounds at top and bottom and main profile in middle.

You did it (each side profile) as one curve - maybe try to dvide this surface into three steps as described above

 

[SW]

Thanks Jacek,

I see where you are coming from, I'll give it a go...

Sam

 

[Jacoolo]

Hi Sam

So how has it finaly ended?

 

[rudresh.hm]

hi Sam,


i think by changing the order/sequence of giving continuity(curvature) you can still refine the results. you can also try dividing the large patch(top right corner of the pic) anolg the middle curve.

 

[SW]

Thanks for the help.

Its changed shape quite a lot now and I've managed to get it to work. I found that adding an extra surface-curvature constrained style curve between the two surfaces, then using this as an internal curve made the transition much better.

Sam