Composites and Intersection Priority

[Anonymous]

Hi all,

I've been playing around with Composites and Intersection Priority now for a while, and seem to be getting the deal with it quite well, and it's a wonderful and intuitive tool when everything works! But, there are a lot of things that I can't do, and when I search forums I can't really find that much about it. If there is some tutorial handling more advanced questions (tutorials tend to only cover the basics) please post it and I will have a look!

(I have read posts like https://blog.graphisoftus.com/archicad-education/tips-and-tricks/building-materials-three-examples-t... and https://blog.graphisoftus.com/archicad-education/tips-and-tricks/building-materials-one-example-to-r... that discuss this matter a bit, but I think my questions are more basic questions, that I would guess there are ways to cope with!)

I will post just 3 quick things that I find odd, that I presume a lot of people have had to handle. I'll divide it into three different posts.

First question (see q_1.png)

Labels show the skins (hope you don't mind the swedish!) and I wrote the materials' Intersection Priority on the side.

Two types of walls and their intersection.
1 - Here everything works fine. This is ok by me.
2 - But when they meet at a corner - how would you do this? (by the way, why are the two top layers of the thinner wall extending past the structure of the thicker wall?)
3 - My solution would be to create copies of the wall types and add "outisde corner" to the name, and assign a stronger plasterboard (here 920) to the outside of both composites. But A) Extra work and adds uncomfortable duplicates to both the material list and composite list... and B) It doesn't really work - see picture. Is there any way to understand or control when it shows the cut line of the material or the skin separator line of the other composite?

[Barry Kelly]

Easy fix.

In my example make the 100 strong plaster 400.

So both plaster skins are stronger than the brick and the cavity.

But that breaks things when you want an internal partition wall maybe.

The brick needs to be stronger than the plaster, but the plaster need to be stronger than the brick for the external corners.

So you can't win.

But you would not build this.

The top horizontal wall should have a cavity as well, then all problems solved because you can make the internal brick stronger than the internal plaster.

As I did say before, possibly not all situations can be catered for, but just remember stronger cuts weaker.

The problem comes when you want one building material to be stronger in one situation but it has to be weaker in another situation (the partition wall) all in the same plan.

But then is the construction correct?Would this scenario ever really happen?

Barry.

[Ahmed_K]

here is another solution that i found, 

For double brick composites, create a flipped copy, to generate real inrersections

[Ahmed_K]

After some research, i got this result, 

The philosophy is to generate real connection in plan, like real life construction

the idea is to work with the same brick material , one weak, another one strong, 

and have to composites, one with strong outside, the other is the inverse, 

in the composite settings, i made invisible  extremity lines of the bricks , so it will look countinious when the wall conncts to the inverted composite, 

here is a screenshot where i made an exemple of a wall with some possible connections, 

[Ahmed_K]

I Have a project in progress, and i used this technique, it's Really powerfull, and it works even with complex juctions , without any problem, 

Pros : Correct prensentation in 2D AND 3D, no chaotic junctions, almost all works clear, Correct quantiti takeoffs ( wall quantity takeoff, no matter the materials inside, the wall classification only matters, for exemle, 35 thickness wall classification calls all composites that have 35 cml thickness, ) 

CONS : This method don't work only when you want to extract quantity of Brick in detail, Area and / or Volume Strong brick sometimes is thick, sometimes is thin, depending on the composite,