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

Moderators: Karl Ottenstein, LaszloNagy, ejrolon, Barry Kelly, Gordana Radonic, nbalogh, mnguyen, gkmethy

griggadee wrote: Wed Apr 21, 2021 10:41 pm Thanks Barry. Do you happen to know if there is a default origin for projects? It's strange how all of the materials line up to the exact same default origin, yet any new complex wall profiles seem to be referenced to a totally different origin point and even resetting this texture does nothing. It's not like I even chose an origin point originally. It's just whatever was set by the programme.

The default origin is your project origin.
Check you surface material settings and see if the 'Random Origin' option is ticked.
I think this will affect the texture position.

griggadee wrote: Wed Apr 21, 2021 10:36 pm Thanks Barry. All layers are turned on and there are no walls under, over or near these walls affecting them in any way. It's very strange to say the least!

In terms of reference lines, having the reference line on the inside of the wall creates the problem. Having the reference line on the outside of the wall overcomes the problem. Whilst this appears to be a good thing, this of course is not a workable solution, because the entire model, across 4-storeys, is drawn with the reference line on the inside, and therefore I would have to redraw the entire perimeter on each floor just to suit that one problematic section, which is just not practical.

I created another video showing the different results for internal and external reference lines and also discovered another piece of the puzzle. It seems that wall thickness is what is causing the issue! The proposed wall is 480mm thick. When drawn at this thickness, the corner issue appears. If I reduce the wall thickness down to 350mm, the corner appears just fine! How utterly strange! Maybe you can test drawing the wall to the dimensions shown in the print screen under and see what results you get? Here is the video:
I don't understand the logic applied here, but it is indeed dependent on the width of the wall.
With the ref lines on the inside and the walls 356mm wide all is fine.
Change them to 357mm and the trim breaks.

There seems to be some sort of tolerance because of the short (36mm) wall.
Make that wall longer and the trim will work again, until you make the walls wider - but this time to a larger width.

You can still use the inside perimeter to place your walls.
Then select them and use 'Modify Wall Reference Line' to swap the reference line to the other side.
Whether you have to select all of the perimeter walls or just those three at the corner I can't say.
If you select those three, it depends on how the ref lines of the other walls tough as to how those corners will trim.

Also no need to redraw the perimeter lines, you can just select it and use pet palette to offset all edges by 480mm.
Then modify all of the external wall so the ref line is on the outside and job is done.

I have always drawn my wall based on the outside perimeter of the building, as generally that is what you know and what you will draw first.

wall_ref_swap.jpg (82.5 KiB) Viewed 142 times
Thanks Barry. All very helpful stuff. At least I have a few workarounds now so cheers for all of your help. Always good to get the brilliant support on this forum whenever I encounter these unexplainable peculiarities.
Sometimes, when I have troubled with walls connections with complex form I'm using polygonal wall instead of several straight (the wall, that you can modify on plan like fill or slab). It saves a lot of time - instead of solving complicated puzzles how they are connecting.