can someone explain this graphisoft tutorial on making flat roof tops

[LuckyST]

I'm interested in more clarification in this tutorial> https://community.graphisoft.com/t5/Modeling/How-to-Create-a-Flat-Top-Roof/ta-p/303418

I can create a mesh that is sloping to the middle.

but how do I create roof layers on top of it as described in the tutorial?

also, there's a hole in the middle of the mesh.

is it created by SEO, or is there another way of creating it?

[Lingwisyer]

After defining your mesh / roof / etc. boundary, you can cut holes using the subtration option, just click on a node and select from the pet palette;

To create the layers, you just asign a composite to it;

Archicad Help - Assign composite to wall, slab, roof or shell 

To create a roof from a mesh, you need to have installed the Goodies package, then add the library to your file via the Library Manager. There are other posts around here about installing it.

Ling.

[DGSketcher]

You don’t need to install the goodies package, you can create the added roofs like normal or even just model them in 3D view over your mesh. If you have a complex mesh then as @Lingwisyer has suggested, the Goodies package may help.

[LuckyST]

hi, thanks for the answer.

With roof, I can make a hole by

1) Create roof

2) Select the roof

3) Klik on the roof tool and draw within the existing roof

With mesh tool, I cant do that. if I try the same procedure, I get this:

finally, even if I ignore the "Hole" in the middle, and just create a sloped mesh, I cant apply the roof to it, since roof can only have positive angle.

the Graphisoft tutorial doesnt mention "goodies", so I suppose its supposed to be doable without them.

any ideas?

[Lingwisyer]

Use a single plane roof and define up as the outskirts.

You do not get the following dialogue after marking out your points on your existing mesh?

[Rubia Torres · Accepted solution]

Hi @LuckyST,

Thank you for bringing up this question. Complementing Ling and DGSketcher's recommendations:

1) Create mesh; hole in the middle (by clicking on the "subtract from polygon" icon in the pet palette); set the perimeter points' height (also using the pet palette); set the mesh thickness in the mesh selection settings dialog:

2) Use the Roof tool, single-plane geometry method to create each inclined plane, tracing over the mesh. In 3D, you may select the planes and move them vertically to perfectly sit on the mesh, then you can also click on one of the hotspots of the smaller side and adjust the slop (pet palette icon):

For a precise finish, select the planes and open the roof selection settings dialog. Set vertical angle for the roof's edge:

Hopefully, the above instructions will be helpful. As a result of this discussion, I have updated our article to specify the geometry method used. Thank you!

Best,

[LuckyST]

thank you for answering the question in depth.
I was not sure if there was something I Was missing as it appeared as if the all 4 roof slabs were created as single object, not 4 separate ones.

this helps a lot. thank you!

[danielk · Accepted solution]

But as mentioned before, manually placing the roofs would take a lot of time, so you should use the Mesh-to-roof add-on (it is part of the goodies add-on).

https://community.graphisoft.com/t5/Modeling/Mesh-To-Roof-Add-On/ta-p/303652

https://www.youtube.com/watch?v=KRVzKNWUyRQ

[LuckyST]

thanks for the links.

its a pitty that the normal roof doesnt accept negative angle... as it would solve all of the issues. I cant help believe its just one variable somewhere in the code that they just need to switch 😞

[Lingwisyer]

Wish: https://community.graphisoft.com/t5/Wishes/Roof-Tool-Negative-Pitch-for-Drainage-Plan-Floors/td-p/30...