Shade umbrella???

[utiler]

Hey guys, I've seen somewhere a thread about making a commercial type of shade sail structure but can't recall the name of the post....

Any ideas?

[unearthed]

Ferrari is your tool, link has download as tool is hard to find:

http://sketchucation.com/forums/viewtopic.php?f=323%26amp;t=32380

if that fails go here:
http://rhin.crai.archi.fr/rld/plugin_details.php?id=768

Source is here some where but page hard to navigate:
http://en.sergeferrari.com/furniture-design/

if it's just a sun umbrella you need I have a nice one on file, just PM me.

[utiler]

Thanks Nigel, I used to use SSB but when curviloft came along I started using that. Have seen Ferrari plugin too but haven't really tried it. I just recall seeing a thread about wanting to model something similar and didn't subscribe to it....

What I'm wanting to model is two 10.0m x 8.0m pyramid type shapes joined together along the 8.0m side. Square sides with concave sides meeting at a small domed apex.... Maybe I'll try to find an example of what I mean.

Just interested in various methods people would attack it.

[Box]

Anything like this?
http://sketchucation.com/forums/viewtopic.php?f=335%26amp;t=55059

[gilles]

What about this one:

http://sketchucation.com/forums/viewtopic.php?f=335%26amp;t=55059#p499764

[utiler]

Thanks guys, both posts one in the same. I can see how Ferrari could do it but I'm trying to do it with current tools I use; I'm sure there is a way.

Below are some examples of what I'm hoping to achieve:

SHADE IDEAS.pdf

Also a skippy file of some base shapes:

Shade.skp

I'm keen to see some different ways to achieve this.

[utiler]

working through it a little more here is what I think the shapes should look like:

Shade.skp

[utiler]

So here's progress but not how I want the outcome...

I thought I may have to create segments of the fabric and make them components seeing each side will be the same however when I do that I end up with hard edges where my shapes connect.

Its really got me beat how you do this. Maybe I should be creating it from the ground up rather than around the edges...?

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Shade.skp

[pbacot]

IDK how to do this for the precise mathematics but you get a different shape if you have a curve at the bottom edge. Not sure this is what you are after.

[jeff hammond]

.

a square perimeter with a rounded top and a drooping mesh using curviloft would be something like this:

tent_su6.skp

[gilles]

This how Ferrari deals with it, for info.

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[mitcorb]

Hi:
I fiddled with this yesterday. I did it two ways. When I did the deed by sections, selecting each curve in sequence, and mirror copied the result, I noticed the mis-shapened circular opening. When I selected everything and then activated the tool, I got a more regular opening. Segment count and size of segments in the curves do matter for more regular surfaces, as well as degree of curvature. My "good" result still had too much torsion/warpage in the finished surface. Did you see this too?

[utiler]

@pbacot said:

[attachment=0:2noo5rgt]<!-- ia0 -->Screen Shot 2014-02-06 at 8.39.13 PM.png<!-- ia0 -->[/attachment:2noo5rgt]IDK how to do this for the precise mathematics but you get a different shape if you have a curve at the bottom edge. Not sure this is what you are after.

Thanks for giving it a go, mate! Normally I would expect the outer edge to be exactly how you've done it but the client wants to be able to fit drapes to the edges to close it in at times....

[utiler]

@jeff hammond said:

.

a square perimeter with a rounded top and a drooping mesh using curviloft would be something like this:

[attachment=1:2w6zx0be]<!-- ia1 -->tent_su6.skp<!-- ia1 -->[/attachment:2w6zx0be]

[attachment=0:2w6zx0be]<!-- ia0 -->tent.jpg<!-- ia0 -->[/attachment:2w6zx0be]

That's pretty much how I had attempted it also, Jeff however the 4 'hips' will actually be welded and stretched so they won't appear to have hard edges....

cheers for the input though!

[utiler]

@gilles said:

This how Ferrari deals with it, for info.

That's close, gillies although the surface on the outside of the apexes differ from the inner. seems 'warped to one side.

Getting close though!

[utiler]

@mitcorb said:

Hi:
I fiddled with this yesterday. I did it two ways. When I did the deed by sections, selecting each curve in sequence, and mirror copied the result, I noticed the mis-shapened circular opening. When I selected everything and then activated the tool, I got a more regular opening. Segment count and size of segments in the curves do matter for more regular surfaces, as well as degree of curvature. My "good" result still had too much torsion/warpage in the finished surface. Did you see this too?

Thanks Tim, what tool did you use?

[Box]

I'm not really sure about what shape it is you are after but this is Extrude edges by rails.
I don't know how you work white on white? sends me blind.

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[jeff hammond]

@utiler said:

That's pretty much how I had attempted it also, Jeff however the 4 'hips' will actually be welded and stretched so they won't appear to have hard edges....

cheers for the input though!

soften the edges after arraying. (or gap the array at the hips and fill in with an actual rounded surface)

the main point being- if you use that outwardly bulging edge of the top ring as part of a networked surface and the opposing edge is straight, the bulge is going to carry throughout the surface.. if you want the surface to sag in the middle, you'll have to do something like i showed (if using curviloft or any of the 2rail sweep plugins)..
maybe with soap skin& bubble you could get the sunken results as it has the pressure adjuster..

[mitcorb]

@utiler:
I used Curviloft by activating the "tent" icon.

[utiler]

So this is where it ended up at but still not convinced its the best result.