Help with modeling of specific dome.

[Anonymous]

Can you point me how to make the following dome:



It has to be modeled as close as possible. Not only the top surface, but the arcs and the curvature in the ridges should be followed. Can you advise me if it is possible and what tool should I use? I'm torn between morph and shell, but neither of the two I am proficient enough to know it can be done.

[Lingwisyer]

You image does not really show the top of it, but I looks like a Domical Vault with a dome ontop?

My guess would be to:
use the Domical Vault object as your base,
then add a dome ontop using the shell tool,
SOE the dome downward from the vault,
SOE the recesses on the sides using other vaults or using a shell if you need a specific profile,
convert the lot to a morph

If you need the ribs on the dome:
create the rib sideways as a complex profile beam
draw a curved beam the radius of your dome in plan
convert the beam to a morph and rotate it to be vertical
position and multiply it around your dome



Ling.

[Hmooslechner]

Workflow something like this:

https://youtu.be/NiSkxirA_FE

Vid should be up in about 20 minutes

[Steve Jepson]

As mentioned in the video, you can place the image/s directly into ArchiCAD for easy reference.
I like to save the image files as a new surface so it can be shown on a wall in 3D while your modeling too. Another tip I would offer is that you draw plan, elevation, and section drawings first, then use those drawings to model the parts you need with precision.

The structure of the bell tower is based on a well documented Byzantine methods as you probably know already. There are lots of examples online that help to understand the fundamentals of the structure. And also some similar examples based on that basic idea. By looking at them you can visualize the distinct elements/parts of it and this will help you to choose what ArchiCAD elements would be useful for modeling each of them. As with everything in ArchiCAD, how you model it depends entirely on what you need to do with it. Is it just a crude geometric representation you need, or are you making working drawings for how to build it. Do yo need a model for a very detailed hi-quality rendering? Or are you just interested in the modeling techniques for how to make the fundamental model parts ? If you needed to know, there are people who know exactly how structures like this were made and have been restored. Perhaps you are making plans for a similar restoration ?
https://stanprom.wordpress.com/2013/11/09/orlov-krs/


Also, the pictures give you something to point at and ask -- how can this part of it be modeled with ArchiCAD?

[Steve Jepson]

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[Steve Jepson]

lots of ways to model it of course, but very few ways to actually create the pendendive.
I used Sphere 22 and Tube 22, there are easily adjusted to fit the drawing in a section view, and some SEO, convert to morph, split... This gives you the curves and node points you will need to attach other things to this basic model.
There is probably a dbl sphere roof, one a little hither than the other, the standing seams would be created by copying a sphere converted to morph and splinting of sections of it 3/16" wide or what ever and elevating them an inch or so. That roof may have originally be oiled leather.

[Steve Jepson]

there is an interesting technique you can use with two or me spheres to generate precision geometric patters
One sphere as with a Resolution set to 999 and another just a little higher set to 24 or something. You can experiment with the height and Resolution of the spheres to generate the patters/spacing you need.
Using SEO to cut the pattern gives you something you can dimension. And no lines and archs to draw is helpful when the patterns are too complex - all automatic

[Steve Jepson]

fewest steps would be like this - be sure you have the objects set to there highest resolution if you want things to be smooth.