Help with creating a 3d-curve


#1

Hey! I’m trying to figure out if there’s a clever way to make a shape similar to the crown of these towers;

Creating the actual curves are no problems ofc. but then to figure out a way to make the curve have a smooth elevation from the start at 0m the tip at 20m is where I get stuck.

So if anyone has any suggestions please let me know.
Thanks!


#2

You could perhaps draw the top curves on a face, then rotate the face to the slope you want.

The perhaps use the CurviLoft plugin to make the curtain walls?


#3

Something like this… though I just copied the bottom curve from the top and scaled it up a bit.

I traced the curves over the image using the Arc tool, keeping successive arcs tangent, with the image horizontal. Then rotated the curves around the red axis.


Curvy top.skp (1.7 MB)


#4

Thanks John for the reply!
Have to say I did not fully understood your process to achieve that, so maybe it will work for what I want to achieve myself. But one more factor is that the walls need to be straight and it’s also important that I can follow the curves drawn horizontally as the model I’m working on is made with geo-locations and I want to be as accurate as possible positions.

Here’s the model paramount.skp (1.2 MB)


#5

It’s looking good.

Unfortunately, I’m still not clear from the original photo just what the geometry is. And not much clearer after finding other images.

Are there any more-or-less plan view images?

[Finds one]


http://www.constructionweekonline.com/article-38714-uae-13bn-damac-towers-by-paramount-tops-out/

Sorry, I have to go out, but will see later if I can think of something further.


#6

Yeh unfortunately there aren’t any new aerial views from this tower to get a grip of the geometry of the crown

But basically this is the starting point and end point;


And I want the curve to have a constant increase just like how you did your example. But at the same time there’s no angle on the wall of the crown.

Here’s a couple of references I’ve used which might give a bit more understand of the geometry.


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