Thanks Michael, yes your file works fine, as for me not managed to do it by trimming, it is exactly what you say, many surfaces overlap each other so i hardly see/understand which part i'm trimming in that mess, i've tried by hiding all but one and then trim one by one by one but i can't say i got great result 'coz even after i trimmed all with outside circle and deleted outside excess areas i still have many overlapping surfaces with corners bending upwards so i've not known how to weld/merge them into that single flat nice surface you got (my screen-grab showing how surfaces are bending upwards=.

Luckily Marcos's solution worked so i managed to fix it with that technique.

Hi Lewis,

re:
> (my screen-grab showing how surfaces are bending upwards=.

Those bending upwards areas are some additional areas that also need to be trimmed off - if you check out the file I posted I also drew in 2 crossing lines here:



Then you trim the surface and remove these areas:



Leaving this part:



- Michael

<< and i always get visible seams or even holes after i try to export that to polys. Not even join or Boolean union helped to solve that.
<< Have you tried to check your version for OBJ exporting ?

Yes and Seems not seams! :)
I made a little thickness because render don't love only simple face! :)
Always free real time SimLab Composer Lite (max 1920 * 1080)

Aha, i get it now how you did it Michael, you basically made 4 pizza slices and then it worked 'coz bending parts are removed. I forgot tot do that cross section trim so that's why i still had messy results.

PILOU - thanks for render test

cheers and thank you both for extra effort.

Beatiful!

Tks.

Hi Lewis,
>>I've tried recreating that surface with network
Attachment with layout for NetworkSrf (This eliminates polar uv layout)

Interesting approach EDDI, does it look same from side in quad view ?

And how did you split edges/curves at exact position, by trimming or there is faster way to split curve/edge ?

>> And how did you split edges/curves at exact position
SplitHelper created with Multiiso script
http://moi3d.com/forum/index.php?webtag=MOI&msg=6841.3



Outer edge with > STRG + C > STRG + V > Join > Trim with AddTrimPoints at SplitHelper position and option keep.
Middle lines drawn with curve through points.

Result Old uv layout and new.

Good, that now has lot more sense and I understand how you did it :).

Thanks

Wink