Adapt truncated cones to a curved extruded surface, controlling circle sized from the truncated cones

Hi everyone,

Here I've uploaded a sketch of what I want to create. I hope this make sense.

The wall is straight until the top where it has a slightly curve. It is formed by truncated cones (in different sizes) and I would like to control the size of the inner and outer circles.

Do you know how can I start with? Which is the best way to create this?

Sorry, I'm new with grasshopper.

Thanks for your help

Regards,

Sandrita

Attachments:

IMG_20160221_172906879.jpg, 983 KB

Replies to This Discussion

Permalink Reply by Nik Willmore on February 22, 2016 at 10:22am

Here is one approach, to create it flat then morph it from a box to a surface, a sort of weird Grasshopper version of the Rhino Transform > Flow Along Surface command.

I don't envy anybody new to Grasshopper.

The two sets of circles, front and back, both had to be grafted in their final form before input to loft, or else you get a dumb loft between all the circles, and simply grafting the input of loft won't work. That was mostly trial and error, and then the working result made sense, since graft makes the loft treat each item in a list separately, but putting both wires into the loft (by holding shift for the second one) and only grafting the input to loft makes no sense since then it's treating a combined list of single circles instead of two lists that can pair up.

The power of at least having complicated access to morphing is that you can distort the target surface (or twisted box etc.) to your desire and the original will still map to it. Just be aware of the Rhino Analyze>Direction command that let's you swap U and V directions and change surface overall face direction too, when these things fail and get all weird looking. So it's best to start with the origin surface, the base of the box, and make a direct copy of that to distort into final form, so the NURBS UV directions match.

Attachments:

Cones TEMP A.gh, 16 KB

Permalink Reply by Sandra54 on February 23, 2016 at 11:31am

Many thanks!! ;)

Permalink Reply by Sandra54 on February 23, 2016 at 12:44pm

Hi again Nik, sorry to bother you again. How did you manage to set the three dimensional points to the first point? I just can "set multiple points" in Rhino when I right click on the point.

Thanks!

Permalink Reply by Nik Willmore on February 23, 2016 at 3:28pm

Try try again. Try right click clearing the points, or start with a new Point component. I don't understand your question actually but indeed I've been frustrated with Grasshopper trying to make me select points by screen clicking or entering numbers in Rhino rather than selecting existing ones.

What I did was place points manually in Rhino, create a new Point component on the Grasshopper canvas, select my points in Rhino, then right click the component to use "Select Multiple Points" just like you say you can do.

Permalink Reply by Sandra54 on February 24, 2016 at 4:18am

Hi again Nik,

I've tried but my points look in Rhino as a normal point(with an "x") but if I click your points they're 3 dimensional (they have 3 coloured arrows showing the direction)

How can I do to have my points looking the same?

Thanks

Permalink Reply by Sandra54 on February 28, 2016 at 10:14am

Hi again Nik,

Please, could you tell me what am I doing wrong with this?

I have created a loft as a surface to be the input of the "Surface Morph" but the geometry is not adopting the surface shape, it's always perperdicular to it.

Many thanks

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