brucestar,
You don't say what version of Archicad you are using.
This info (as well as your operating system) can affect the answer you need.
Best to add it to your Profile signature to save writing it in every post.
If you are using 17 or 18 the Building materials all have various strength values.
If you have "Legacy" mode turned of then you will be using these Building material strengths and Archicad will automatically determine which element will cut away the other element.
So if for example you have a simple slab and a wall penetrating that slab then ...
If the slab is stronger than the wall then it will cut the wall where they intersect.
But because the slab is still solid it can be used with Solid Element Operations to subtract the wall with upwards or downwards extrusion.
If the slab is weaker than the wall then the wall will cut the slab where they intersect - effectively creating a hole in the slab where the wall passes through.
Now because the slab is not solid(it has a hole the same size as the wall) it can not be used in an SEO because there is not slab to cut the wall away.
Hopefully the attached image will help to explain.
You can choose a different Building Material for your walls and slabs so the slab is stronger than the walls or you can turn the "Legacy" mode on and then the SEO will work as you expect (but you will lose all of the automatic trimming of elements in section/3D).
With Legacy mode off a lot of attention needs to be paid to the strengths of each building material.
If you can post an image of what you are trying to trim (even if just an example and not a real situation) then we may be able to come up with some more solutions.
Barry.
You don't say what version of Archicad you are using.
This info (as well as your operating system) can affect the answer you need.
Best to add it to your Profile signature to save writing it in every post.
If you are using 17 or 18 the Building materials all have various strength values.
If you have "Legacy" mode turned of then you will be using these Building material strengths and Archicad will automatically determine which element will cut away the other element.
So if for example you have a simple slab and a wall penetrating that slab then ...
If the slab is stronger than the wall then it will cut the wall where they intersect.
But because the slab is still solid it can be used with Solid Element Operations to subtract the wall with upwards or downwards extrusion.
If the slab is weaker than the wall then the wall will cut the slab where they intersect - effectively creating a hole in the slab where the wall passes through.
Now because the slab is not solid(it has a hole the same size as the wall) it can not be used in an SEO because there is not slab to cut the wall away.
Hopefully the attached image will help to explain.
You can choose a different Building Material for your walls and slabs so the slab is stronger than the walls or you can turn the "Legacy" mode on and then the SEO will work as you expect (but you will lose all of the automatic trimming of elements in section/3D).
With Legacy mode off a lot of attention needs to be paid to the strengths of each building material.
If you can post an image of what you are trying to trim (even if just an example and not a real situation) then we may be able to come up with some more solutions.
Barry.
Still looking?
