varying beam size/profile extrusions

Hi Jon,

Is there a "natural" way in geogym to make profile extrusions that vary in scale from one end to another?

What I mean is something like the suspended members in the picture below. If you ignore the holes, what I am trying to achieve is the beam's depth/breadth size specificity. All I can think of is either lofting three different profile curves located at different points on a curve or orienting a profile and then scaling it throughout a curve. Is there a quicker way to do it with the plug-in?

Replies to This Discussion

Permalink Reply by Jon Mirtschin on March 3, 2013 at 11:49pm

Hi Rene,

Thanks for posting the question.

Yes, it's possible to define tapered members in IFC. I have enabled this to some extent. I've attached an example, the axis path must be on centreline (not a topmid cardinal point for the time being, I'll see if I can enable that). The revit addon will create a tapered family beam.

If it's not behaving as you need, let me know and I'll try to improve it ASAP.

Cheers,

Jon

Attachments:

130304 beam standard case taper.gh, 10 KB

Permalink Reply by RENE on March 4, 2013 at 1:12am

Thanks Jon, I'll take a look at it

Permalink Reply by RENE on March 4, 2013 at 3:07am

worked amazingly, as always, thanks Jon!

Permalink Reply by RENE on March 19, 2013 at 3:22pm

Hi jon, I have this same question again but for a curve instead of a line. The ggIFCBSC component asks for an axis for the profile sweeping, but there is not tapering if it's a curve. I want the bottom part to be thicker...thanks in advance!

Permalink Reply by Jon Mirtschin on March 20, 2013 at 9:59am

Take a look at the sectioned spine shape representation (that is similar to a rhino loft) and don't use a standard case component. If you can't get it to work and can send me the file I'll take a look.

Permalink Reply by Damon on February 6, 2015 at 8:11am

I know this is an old thread, but I found it trying to solve the problem of creating tapered beams using GG to import to Revit. Using your example above, this is the result I get:

As you can see, it isn't a tapered beam. It seems to be sweeping both profiles along the axis path.

Thoughts?

Permalink Reply by Jon Mirtschin on February 6, 2015 at 2:01pm

Hi Damon,

Thanks for the post. If I recall, soon after enabling the method in the example script, I found out there was an improved way of defining a tapered element in IFC4 (before that I was using a bit of a fudge). So looking at the old definition it seems I "broke" the previous way. I've attached a new sample that shows the newer method, is that acceptable?

Cheers,

Jon

Attachments:

150702 beam standard case taper.gh, 16 KB

Permalink Reply by Damon on February 6, 2015 at 2:08pm

Jon,

As always, a super quick and helpful response! It works for what I need.

Thanks,

Damon

Permalink Reply by Damon on February 10, 2015 at 1:51pm

OK, so a little glitch, but I think I found a solution:

My custom profiles are drawn on the XY plane with their top midpoint at (0,0).

The axis lines in my Rhino model are top mid of the members.

If I set I=MID in the Beam Standard Case component, the GH preview looks good:

Unfortunately, when I bring that into Revit, it does this:

(The red centerline is a DWG import). When I edit the Structural Framing family, it is drawn with the top of the member at the reference plane.

So I can fix the problem if I select all the beams and set the "z Justification" parameter to "Top."

I tried drawing my profiles so that their center is at (0,0) and choosing I=TOPMID, but I get stranger behavior that I can't correct in Revit. Hope this is helpful information.

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