topic Re: 3d fillets for roof planes in Modeling

3d fillets for roof planes

Anonymous — Tue, 23 May 2023 13:30:22 GMT

Here in Hawaii a common detail is to have a roof with a moderate pitch that transitions to a low pitch along the perimeter with gentle radiused transition.
I am trying to figure out how to show this radiused transition.

I cannot find a tool to fillet these planes. In fact, I cannot see a way to fillet 3d objects at all. Were I to resort to the profiler, then I would wind up with additional false lines, no? Not to mention the fact that profiler objects are inflexible.

Mahalo!

Re: 3d fillets for roof planes

Anonymous — Sat, 08 Apr 2006 03:22:57 GMT

Jesse,
None of AC's tool elements are filletable.
You could use the barrel vault construction method in the roof tool
to make the filleted transition but you would see all of the edges
of the little roofs that make up the curved part of the roof.

When you say "Were I to resort to the profiler, then I would wind up with additional false lines" Do you mean the upper and lower edges of
a curved Profiler object ?
You could position the object's height so that it's top surface is 1/64"
below the roof planes and thus hide the object's edge lines.
If you are using 3D vectoral hatches on the roof surfaces you
are going to have trouble making the objects texture coordinate
with the roof texture.
You could use TrussMaker but this involves some of the same issues.
But for the same job Truss maker is faster.

Peter Devlin

Re: 3d fillets for roof planes

Anonymous — Sat, 08 Apr 2006 16:06:32 GMT

Another possibility is to do a big chunk of stuff and use SEO's to cut the top and bottom to the shape you need -- although it seems to be a convoluted method it is fairly clean and allows for future changes in thickness by setting the top surface to be connected to upward changes and the lower to follow any changes in the lower surface.

Lew Bishop
AC 9 2219
OS X 10.6
Dual G5 2.0/ 4GB/ nVidia 6800

Re: 3d fillets for roof planes

Anonymous — Mon, 10 Apr 2006 18:31:25 GMT

None of AC's tool elements are filletable.

(
So much for "solids modeling"
I guess I'll just have to fix all my sections and elevations by hand. 😛

At this point I think I'd be better off with a solids modeler and 2D drafting program. Unfortunately i don't get to pick the software at my office.

Re: 3d fillets for roof planes

Anonymous — Mon, 10 Apr 2006 19:29:34 GMT

Jesse wrote:
So much for "solids modeling"
I guess I'll just have to fix all my sections and elevations by hand. 😛

At this point I think I'd be better off with a solids modeler and 2D drafting program. Unfortunately i don't get to pick the software at my office.

ArchiCAD is a building modeler which is ultimately a far more complex specification than a 3D modeler. This means that more complex 3D forms have not yet been accommodated into the system (since it must also know what they are and at least something about what they are made of and how to build them).

A 3D solids program such as form•Z is better at getting the proper shape for complex solids, but there is no intelligence built into the parts so the documentation becomes disconnected manual drafting. Since it sounds like you will be using ArchiCAD perhaps you should search the guide under the keyword "workaround"

Re: 3d fillets for roof planes

TomWaltz — Mon, 10 Apr 2006 19:39:17 GMT

Jesse wrote:
Here in Hawaii a common detail is to have a roof with a moderate pitch that transitions to a low pitch along the perimeter with gentle radiused transition.
I am trying to figure out how to show this radiused transition.

I cannot find a tool to fillet these planes. In fact, I cannot see a way to fillet 3d objects at all. Were I to resort to the profiler, then I would wind up with additional false lines, no? Not to mention the fact that profiler objects are inflexible.

Mahalo!

Do you have a sketch of this? I have a couple ideas bouncing around in my head that might get you the result you want, but I want to make sure I'm picturing the right thing.

Re: 3d fillets for roof planes

Anonymous — Tue, 11 Apr 2006 03:08:09 GMT

Jesse wrote:
Here in Hawaii a common detail is to have a roof with a moderate pitch that transitions to a low pitch along the perimeter with gentle radiused transition.
I am trying to figure out how to show this radiused transition.

I cannot find a tool to fillet these planes. In fact, I cannot see a way to fillet 3d objects at all. Were I to resort to the profiler, then I would wind up with additional false lines, no? Not to mention the fact that profiler objects are inflexible.

Mahalo!

Jesse,
Unfortunately there is no straightforward or easy way to model this "sweep" in ArchiCAD. OK...I know you don't want to hear this ....but.... you really need to solve this with a custom GDL object.

If someone took the time to study the geometry required, they could write an object that would work for just about any variation of sweep you might encounter.

I know exactly what you're trying to achieve but don't have time to script these days...I bet, however, if you post a sketch with some specs/dims someone in this forum might create it for you...at the very least you'll get some more ideas.

HTH,
Dan Kunschiik

P.S. please tell Peter I said hello

Re: 3d fillets for roof planes

Djordje — Tue, 11 Apr 2006 16:01:27 GMT

Don't scare the man, he thinks visually.

Just create a Profiler object and fit it to the roof. If you use the roof surface fill, it is a good bet that the joint will not be seen at all.

Re: 3d fillets for roof planes

Anonymous — Wed, 12 Apr 2006 03:27:07 GMT

TomWaltz wrote:

Do you have a sketch of this? I have a couple ideas bouncing around in my head that might get you the result you want, but I want to make sure I'm picturing the right thing.

This is so simple it doesn't require a sketch. Imagine a 4:12 lower overhang. Above is a 6:12 hip roof. Where the pitch changes, I need to fillet with a radius of 10-20 feet.

To reiterate, I don't have the time for GDL. I should be drawing elevations and sections.

Djordje wrote:
Just create a Profiler object and fit it to the roof. If you use the roof surface fill, it is a good bet that the joint will not be seen at all.

That would not be the case for a hidden line drawing, and for elevations, there is no hatch.

Re: 3d fillets for roof planes

Djordje — Thu, 13 Apr 2006 16:17:24 GMT

Jesse wrote:
Djordje wrote:
Just create a Profiler object and fit it to the roof. If you use the roof surface fill, it is a good bet that the joint will not be seen at all.
That would not be the case for a hidden line drawing, and for elevations, there is no hatch.

Well, if the pitch is changing, as it is, there should be a line there!

Jesse wrote:
No one else in my office uses the 3D portions of ArchiCAD, because even the best and the brightest cannot figure out how to get it to work the way the want. I guess I'm too stubborn. I hate to let a computer win any fight. I want sections and elevations to work, but usually what I wind up with is hideous compared to a strictly 2D drawing. So in the end I just wind up using the auto sections/elevations as an outline. :-~

It is excellent that you are stubborn and a waste of software that the others can't see the forest from the trees ... funny ... did you have any training as the office with Rex?

Re: 3d fillets for roof planes

Anonymous — Wed, 19 Apr 2006 01:27:06 GMT

Djordje wrote:
Well, if the pitch is changing, as it is, there should be a line there!

Were I to draw this by hand, there would be no line. As I stated previously, the pitch change is radiused, thus no line.