topic Re: how to do parametric streets in archicad? in Modeling

how to do parametric streets in archicad?

Anonymous — Thu, 03 Feb 2011 19:27:20 GMT

Hello,

I have to do some urban planning drawings in archicad (it may be in 2D only) and in thought about finding some way to parameterize the streets in order to represent at once the street, the sideways and the tree lawns and more important to modify them (like a polyline) without having to redo all the work again and again. The exact contours and calculus in intersections, roundabouts, inclinations are not that crucial at this phase because there will be a specialized road project, this being only the urban planning proposal. At first I tried to do some custom line types from Symbol Line Types but I could't fillet the intersections and couldn't snap in other points than the axis line along with other shortcomings. Any suggestions for that?

Thanks

Re: how to do parametric streets in archicad?

Nando Mogollon — Thu, 03 Feb 2011 19:36:14 GMT

Have you tried Profiled Walls? is not a "parametric" in the way your looking for, but you can change the profile any time.

On the other side, I can only imagine scripting an object for street profiles, but those won't work as poly-lines but separate objects

HTH

Regards

Re: how to do parametric streets in archicad?

Steve Jepson — Fri, 04 Feb 2011 05:31:57 GMT

You could use walls/custom profiles/composites for making roads with curb, gutter, sidewalks, striping, all at one time.

Re: how to do parametric streets in archicad?

Anonymous — Fri, 04 Feb 2011 08:28:02 GMT

This is what I achieved so far. I used composite wall structure. The problem resides in the filleted zone of the intersection, the street must intersect with fillet at a min. 4.00m not angular.
Currently I draw a sketch with the walls then I explode the walls in 2D elements, erase the fills and then manually do the fillets. Is there any method to take things further in order to automate the fillets?
Thanks

Re: how to do parametric streets in archicad?

Laszlo Nagy — Fri, 04 Feb 2011 11:38:49 GMT

Do the sides of the roads using Profiled Walls and do the roads using Slabs.
You will not be able to achieve these results by modeling one road with one wall.

Re: how to do parametric streets in archicad?

Dwight — Fri, 04 Feb 2011 16:27:30 GMT

The simplest way is, as Steve says, a custom profile for the sidewalk, curb, gutter, but create only one half of the roadway. You are then drawing each side of the road independently. This lets you crown the road.

When you come to an intersection, draw your corner radii. Viola!

There will be a void in the center. This part can be filled with a magic wanded slab.

Of course, no road is flat for very long, except in South Dakota. You'll need OBJECTIVE to create descending curves.

Also investigate ArchiTerra.

Re: how to do parametric streets in archicad?

Dwight — Fri, 04 Feb 2011 19:34:24 GMT

And, of course, you can constrain the complex profile stretching to the roadway segment only for a horizontal stretch, keeping the sidewalk, curb and gutter undistorted.

Re: how to do parametric streets in archicad?

Steve Jepson — Fri, 04 Feb 2011 20:29:08 GMT

It's always a good idea to educate yourself about how it is actually done in the field. This will guide you very well for how to go about modeling things in ArchiCAD.
What are the critical points you can add now to your model that will be useful when you refine the model into something more than a concept sketch.

learn about the equipment and the CAD files they use with it.

Just like everything you model with ArchiCAD, let the actual construction process determine how you do the modeling.

Re: how to do parametric streets in archicad?

Dwight — Fri, 04 Feb 2011 20:32:36 GMT

Of course we can do plain, twisted ramps.

Now show this with a unified section depicting sidewalk, curb, gutter and crowned roadway together. [Without creating a hard-to-manage GDL TUBE]

Only OBJECTIVE can take this articulated section and easily extrude it.

Re: how to do parametric streets in archicad?

Steve Jepson — Fri, 04 Feb 2011 21:18:55 GMT

Extrusion is not the only way to make a road.
SEO works very well for this as well.
The trick to making curved sloping roads, curbs,gutter, etc... is learning how to make a thin surface that mimics the surface of the mesh/terrain.
You can use this as an SEO operator to subtract with upward or downward extrusion. This is how you get walls and things that follow the curve of the terrain exactly.

Re: how to do parametric streets in archicad?

Dwight — Sat, 05 Feb 2011 00:40:19 GMT

But the problem with making a road is that roads DON'T follow contours - if you are going change your posting from an abstract ramp and going to become picky with your curbing details, please also acknowledge the various cut and fill procedures road builders undertake to control grading and keep traffic moving smoothly.