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Modeling and drafting in Archicad. (Example: How can I model a Roof soffit/fascia?)

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User avatar
By Vojtech Slavik
#328243
Hi, is there some tips how to get know that mesh will be or not visible in 3D ?

For example when I'm bendig too much I can't see mesh and if I I reduce bending it's gonna show in 3D.
Also this happen when I have some holes in mesh.

Do you know whats the right doing it to avoid it

Thanks :-)
Attachments
Skärmavbild 2021-06-14 kl. 12.00.35.jpg
Skärmavbild 2021-06-14 kl. 12.00.35.jpg (70.36 KiB) Viewed 136 times
Skärmavbild 2021-06-14 kl. 12.00.30.jpg
Skärmavbild 2021-06-14 kl. 12.00.30.jpg (344.16 KiB) Viewed 136 times
Skärmavbild 2021-06-14 kl. 12.07.36.jpg
Skärmavbild 2021-06-14 kl. 12.07.36.jpg (79.89 KiB) Viewed 136 times
Skärmavbild 2021-06-14 kl. 12.01.36.jpg
Skärmavbild 2021-06-14 kl. 12.01.36.jpg (368.51 KiB) Viewed 136 times
User avatar
By Braza
#328246
Hi Vojtech,

It may be some kind of bug related to micro gaps between coincident arcs. :?:
I can see that there is a node in the middle of an Arc on the bottom one.
Check it the Arcs are really coincident (Curve and Nodes).
Hope this helps.
User avatar
By David Maudlin
#328249
Vojtech Slavik:

What is probably happening is that the straight edge is crossing the arc near the nodes at the top and bottom of your shape. This creates a self-intersecting polygon that is impossible physically, so cannot be shown in 3D. Sometimes this can be seen by zooming in very close at the node.

David
User avatar
By Vojtech Slavik
#328251
I don't think there is micro gap, there is must be some limit how thin can be mash or something.
This is example but if I have more complicated ground sometimes is very hard to find which "corner" is doing this problem



Braza wrote: Mon Jun 14, 2021 11:23 am Hi Vojtech,

It may be some kind of bug related to micro gaps between coincident arcs. :?:
I can see that there is a node in the middle of an Arc on the bottom one.
Check it the Arcs are really coincident (Curve and Nodes).
Hope this helps.
Attachments
Skärmavbild 2021-06-14 kl. 13.17.23.jpg
Skärmavbild 2021-06-14 kl. 13.17.23.jpg (65.88 KiB) Viewed 121 times
Skärmavbild 2021-06-14 kl. 13.17.28.jpg
Skärmavbild 2021-06-14 kl. 13.17.28.jpg (244.27 KiB) Viewed 121 times
Skärmavbild 2021-06-14 kl. 13.17.37.jpg
Skärmavbild 2021-06-14 kl. 13.17.37.jpg (52.51 KiB) Viewed 121 times
Skärmavbild 2021-06-14 kl. 13.17.41.jpg
Skärmavbild 2021-06-14 kl. 13.17.41.jpg (256.7 KiB) Viewed 121 times
User avatar
By Vojtech Slavik
#328252
It's definitely this but is there some way how to avoid it... because this information is not visible in 2D
David Maudlin wrote: Mon Jun 14, 2021 12:17 pm Vojtech Slavik:

What is probably happening is that the straight edge is crossing the arc near the nodes at the top and bottom of your shape. This creates a self-intersecting polygon that is impossible physically, so cannot be shown in 3D. Sometimes this can be seen by zooming in very close at the node.

David
User avatar
By Braza
#328257
Yes. David is correct.
It looks like a, lets say, limitation for the Mesh geometry. As I tested with Slabs and it works fine. :?
If using a Slab is not an option, as a workaround: Create node in the arc segment, right next to the point of inflection. Then convert the tiny arc segment to a straight one. This would do the trick. :mrgreen:
Another solution, is to create a single pavement Mesh that covers also the lawn. Then do a SEO operation to cut the lawn from the pavement.
Hope this helps.
User avatar
By Lingwisyer
#328275
I usually end up chamfering the points of meshes that are like that. It prevents any degen issues and is purely cosmetic, in my case anyway.



Ling.