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What sort of curve is this ?

RogerS

RogerS

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The roof line? Can't decide if it's an arc or something more grand ?

And how would one draw it in SketchUp (the free version ?)
 
Here goes, but I haven't tried it.

I think each side of the roof is part of a cylinder, and each part of each cylinder intersects with it's adjacent two.

Does that make sense?

That's how I would start to have a go at that.

Or.....I might try a Follow Me.
 
Looks asymptotic to me Roger

Possibly an exponential of the form y = a*e^-bx where a and be are constants

It could easily be a portion of an elipse which is a conic section and easier to layout by non mathematical means and more sympathetic to on site work

Bob
 
Malc....Follow-Me is what I'd use once I had the initial curve.

Bob...to mathematical for me ?

Jimmy...'sprockets' ? We had one of these at our old house.....well, a bit more elegant than this one TBH...this one is a bit 'clunky' in style...the construction was quite clever albeit leaky. The roof panels were ply and sat on sort of gluelams made from ply. They used CNC to cut the ply panels out.
 
double%20arc%20roof_zpspazlriw4.jpg


Create an arc in one axis. Join its two back sides together!!

Push/pull to a usable length.

Create a copy.

Rotate it 90.

Move them together as a corner.

Intersect them.

Delete the parts outside the joined curve.

I then created a copy and flipped it using the scale command and joined them together.

I then selected everything and used the scale command to squish it downwards and this was the result.

double%20arc%20roof2_zpsyxw2mf9p.jpg
 
:eusa-clap: :eusa-clap: :eusa-dance: :text-bravo:

Brilliant, Malc...many thanks.

Which version of SU are you using? I may have to upgrade my one.
 
You're welcome, Roger.

I quite enjoyed using the grey cells to solve the problem.

I'm using V16, and 17 is knocking on my door, but I've not downloaded it yet.

If you want, let me know the width and length of the roof and the height at the ridge, and I'll try and make the model and send it to you as a .skp file, so you can build the rest of the model around it.
 
What is the proper name for this sort of roof design? At first I thought "Cathedral" but that just refers to the joist-less internal design and not the curved roof surface shape.
Google does not seem to be helping me today.

TIA
Bob
 
9fingers":1lkic23i said:
What is the proper name for this sort of roof design? At first I thought "Cathedral" but that just refers to the joist-less internal design and not the curved roof surface shape.
Google does not seem to be helping me today.

TIA
Bob
Click to expand...

Pagoda maybe?
 
The Southampton-Didcot railway line goes through the edge of our village though there's not much left of it.
I worked on the Whitchurch Bypass in the early 70's and swallowed up more of it but we kept the old station buildings which were sold and converted to homes.
It had only been closed for about 8yrs but it was already overgrown with trees etc on the track bed - you couldn't get a Land Rover through it.

Rod
 
Pagoda does infer the general shape but pagodas often have more than one such roof layer and often even more exaggerated curves
I'm sure this is a classic English style but can find the name.

Concave hipped and concave Mansard are similar but still not spot on.
It is starting to annoy me that I can't find the real name.

Where is Mike G when we need him!

Bob
 
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