topic Re: Roof Split Bug in Modeling

Roof Split Anomaly

Steve Jepson — Tue, 23 May 2023 12:25:29 GMT

I am trying to splitting a roof (driveway slab). This function does create the additional roof produced by the split, however, it does not split the original roof which remains un-split. ?

see attached video http://screencast.com/t/xOLxMTfoUs

Re: Roof Split Bug

NCornia — Tue, 25 Aug 2015 20:49:30 GMT

Steve,

That is a quirky behavior. I could not reproduce it with a similar condition. I will PM you and maybe you could upload a copy of the file to us to understand how it occurred.

Best regards,

Re: Roof Split Anomaly

Steve Jepson — Wed, 26 Aug 2015 00:00:21 GMT

Having had some other problems with the shortcut to ArchiCAD in Windows 10 I have ran a repair/re-install with out backup. I can no longer reproduce this anomaly so it must not be a Bug.

I will change the Subject heading to Roof Split Anomaly.

Re: Roof Split Bug

Steve Jepson — Wed, 26 Aug 2015 03:24:20 GMT

Part of the problem came when creating an arch on one of the roof edges.

Creating an Arc Radius on part of the roof created a whole bunch of little tiny invisible roofs when the Arc Radius was stretched to a certain radius where the tip of the Arc must have been very near to the same as lower edge of the roof. It is hard to describe but the motions look like this.
http://www.youtube.com/watch?v=KEKHD0HA4pQ

It is in stretching the arc a tiny fraction too far that it creates many little roofs at the tip of the arc. In this case, if the arc is stretched to 8'-0 1/32" or some tiny bit more, or perhaps less, it creates many tiny little roofs that are too straight to be part of the arc - I think. In any case, these tiny little roofs were found in my schedule with 0 surface area and 0 volume, and you can't see them unless they are selected, and even then they are so small that the dot for their nodes is hidden by the node point of the main roof. Very tiny, but can cause problems.

Why the roof split was creating the split part of the roof but keeping the original roof whole I don't know.

Re: Roof Split Bug

Steve Jepson — Wed, 26 Aug 2015 04:24:37 GMT

I was able to reproduce the error again. For those of you who may be interested here is a like to a .pln with a roof that if split along the line will reproduce the anomaly. The original roof will remain whole, and a split off part will be created.

https://www.dropbox.com/s/461esk2tkic7zg5/roof%20split%20test.pln?dl=0

It's not so much that this is a bug as it is something that is not idiot proof.
If the roof were more precisely modeled this anomaly does not occur.

This is one reason why I always work to the 1/64" during production and then use a dimension setting to the 1/8" or 1/4" for final prints.

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