topic Re: Roof ridge join problem in Modeling

Roof ridge join problem

Anonymous — Tue, 23 May 2023 13:37:57 GMT

When I create a polyroof over a set of walls the ridge lines don't actually join along the main ridge and two hips, effectively dividing the roof in half with about a 0.05mm gap! This is normally un-noticed in plans and elevations and is near impossible to measure but when I edit the roof to make a Dutch gable and trim a wall object to the roof for the gable infill using SEO, there is a narrow strip of wall poking up through the gap! I have to then zoom right in and shift the nodes of the roof so they meet and it is fixed.

Am I doing something wrong in creating the roof or is this a bug?

All construction grids etc are square and all walls have been placed square, then the roof is placed over the walls using the Magic Wand, SO WHERE IS THE "OUT OF SQUARE-NESS" COMING FROM??

Re: Roof ridge join problem

Steve Jepson — Tue, 15 Feb 2005 01:53:12 GMT

Ctrl-click.

In 3D, Select the roof with the highest ridge - press Ctrl and then right click on the low ridge.

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:20:58 GMT

Thankyou

Steve wrote:
Ctrl-click.

In 3D, Select the roof with the highest ridge - press Ctrl and then right click on the low ridge.

For some reason, after much trying, this actually did fix the problem this time! I have searched this forum before and come up with this fix but it has never worked. What took the time was trying to get the select tool to select either edge while zoomed in (so close together!) and then trying to figure out which was the higher edge to get the lower to meet! See attached drawings for more problem detail.

This is a fix but can anyone explain why the program can't make a simple roof properly?
Does anyone else have this problem?

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:24:52 GMT

I noticed elsewhere here that you can't attach more than one image...

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:26:05 GMT

...

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:28:36 GMT

Notice the zoom on these. It is very hard to work out what is wrong, why it won't work. In the case of the Ctrl-Click tool, it is hard to see which edge is highest!

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:30:09 GMT

Section view at the ridge.

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 05:31:16 GMT

Ridge section detail showing small gap.

Re: Roof ridge join problem

Karl Ottenstein — Tue, 15 Feb 2005 06:07:17 GMT

It is very often easiest to join the roof edges if you pull them back first, so that each edge is very clearly visible. THEN, select (click) one roof plane and ctrl-click the edge of the roof that you want to join to. Then do vice versa.

In particular, if you are joining a shed or gable dormer to the parent roof, this seems to be the most foolproof and fastest way to do so to me. (Note that the ctrl-click join process will not cause an over-extended roof edge to pull back... so you must be sure that the edges are a fair distance from where you expect the joint to be.)

Work in 3D and rotate through the model. Hidden line mode (internal engine) or wireframe can sometimes be helpful. Attached image shows pet palette in 3D to adjust the roof edge prior to the ctrl-click operation.

There may be a better way of course...

Karl

Re: Roof ridge join problem

Ben Odonnell — Tue, 15 Feb 2005 08:31:08 GMT

Colin wrote:
Section view at the ridge.

I think you may have found a consistency problem. If you have a look at the image I have attached, you will see that you can choose to have all of the joins, edges vertical.

I know that when you create a polyroof you also get the opportunity to have vertical joins, edges. It seems to work but you don't get nice clean joins at your ridges, you need to CRTL click the ridge to get a clean join.

This to me, seems irrational. It should work the same regaless of the geometry method.

When you created your polyroof did you use the magicwand or did you draw out the footprint of the roof by following the wall line?

Cheers.
Ben

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 09:40:15 GMT

Hi Ben,

I always use the vertical edges on my roofs and I usually use the Magic Wand.

When making a roof, I have a ceiling storey and I create a slab by tracing the outline of the exterior walls below ghosted, to get the roof shape needed, then stretch it to add porches, verandahs as necessary. This then becomes my ceiling and is good for sections, interiors etc. (I love the section tool!) With the PolyRoof I can then just click this ceiling slab with the Magic Wand and I have a roof completed for me! Thats one reason I forked out nearly 10k for this thing! I love it. I can then edit the roof as I need to for gables etc, but the hard work is done in a blink! Onlookers love it! I'm sure this roof creation idea is nothing new to the "oldies" on this site and software... (they might have something better?)

What I am having trouble comprehending/accepting is how the program can do all this but then not quite join the corners of the roof planes! So near and yet so far...

I wondered if it was the .5º in my roof pitch of 22.5 but any pitch seems to do it and it also does it if I manually trace the walls below, instead of MagicWanding. The way the "cracks" appear seems to suggest to me that, if the roof is right, then the walls I'm tracing are out of square, a bit "diamonded", stretched minutely diagonally but this is not the case!

I'm baffled why and disappointed but will charge on relentless and join the club (I hear them calling! ). There has to be a cloud for every silver lining!

Thanks and any more experiences, tips, etc I enjoy!

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 14:45:26 GMT

What I am having trouble comprehending/accepting is how the program can do all this but then not quite join the corners of the roof planes! So near and yet so far

In my experience, the only thing that causes roofs to have a small gaps like you have illustrated, is if the roof has inadvertently been moved slightly or the roof pitch has been changed. You could lock your roof layer in all of your views to help prevent this. Check to see if your spring point line is still exactly on the outside of your wall (or wherever you chose to place it).

Re: Roof ridge join problem

Link — Tue, 15 Feb 2005 15:07:46 GMT

This is a known bug with roofs created with the polyroof method. It was recently discussed (in part) here:

http://archicad-talk.graphisoft.com/viewtopic.php?p=30753&highlight=roof#30753

Cheers,
Link.

Re: Roof ridge join problem

Anonymous — Tue, 15 Feb 2005 22:41:01 GMT

Mike - when I use the Polyroof, the gaps appear instantly when the roof is created. After using the Ctrl-Click trick to join them, any "global" or "single roof plane" pitch change does not affect the joins (2d plan positions of nodes)!

Link - Thanks for the link . I actually found that when it was first posted, while searching for answers and didn't quite understand what Steve and others were meaning. Was good to go and read thru now after this! I figured there had to be something wrong! I hope they can fix it.

Re: Roof ridge join problem

Karl Ottenstein — Thu, 17 Feb 2005 02:10:49 GMT

Yup, see what you're seeing now: definitely a bug with the polyroof (auto hip) method.

Karl