topic 2D Length for Railing panel? in GDL

2D Length for Railing panel?

MinhNguyen — Thu, 17 Aug 2023 08:51:39 GMT

Hi all,

I'm getting started with GDL, so please excuse me foe the dumb question!

To get the 3D length of the railing panel I can use RAILINGPANEL_GEOMETRY to get the coordinates of the points and subtract to get the length. But this one doesn't work in 2D. I tried the same trick with RAIL2D_FULL_POLYGON_GEOM but it doesn't work. Maybe I got lucky and have the 3D one working without thoroughly understand how it behaves. Can someone show me how I can get the panel's length in 2D script?

Thanks a lot in advance!

Re: 2D Length for Railing panel?

Toper Barrientos — Fri, 18 Aug 2023 02:52:53 GMT

Hi.

Kindly investigate this.

Re: 2D Length for Railing panel?

MinhNguyen — Fri, 18 Aug 2023 06:18:35 GMT

Hi, not sure if this is an answer to my question?

Re: 2D Length for Railing panel?

Toper Barrientos — Fri, 18 Aug 2023 07:12:36 GMT

Hi Minh.

Im sorry for some glare answer.

What i mean is try to open the railing tool.. fr. there, several gdl scripts will open.

Then, go to the macro for 2d, & check the relevant 2d coordinates of the panel length.

Re: 2D Length for Railing panel?

MinhNguyen — Fri, 18 Aug 2023 07:15:20 GMT

Ah, thanks for the info! What I'm trying to build is a custom railing panel from scratch, and I need the panel's length in each segment for calculation. I succeeded with RAILINGPANEL_GEOMETRY in 3D script to get the value, but couldn't find its equivalent in 2D script 😞

Re: 2D Length for Railing panel?

Barry Kelly — Fri, 18 Aug 2023 07:27:05 GMT

I created my own panel once.

If I remember correctly, I just used an existing panel and changed the 3D part of the script to show what I wanted.

I left the 2D script alone as it is just a symbolic representation and I was happy with that.

It will adjust automatically as you adjust the post spacing or segment lengths.

Barry.

Re: 2D Length for Railing panel?

MinhNguyen — Fri, 18 Aug 2023 09:14:06 GMT

Thanks Barry!

Then maybe I will frame my question differently:

Is there a way to get the length of the panel into 2D script of the panel? Like we put dimensions for the panel on floor plan, but to have the value calculated and useable in GDL (whether its 2D script or Parameters, I just need the numbers out for calculation)

Re: 2D Length for Railing panel?

Barry Kelly — Fri, 18 Aug 2023 09:44:06 GMT

I haven't tried getting lengths in 2D.

I see there are commands to get info in 3D but not so much in 2D

There is ... RAIL_CONNECTING_POSTS

Something about a proportional value for the position of posts where 1 is the overall length (of I assume the segment).

So maybe you can deduce the panel length from that, but it all sounds a bit difficult.

Barry.

Re: 2D Length for Railing panel?

Peter Baksa — Thu, 24 Aug 2023 14:04:15 GMT

Hi,

You can't get the 3D length in 2D of the panel object. The projected length can be calculated from RAIL2D_FULL_POLYLINE_GEOM.

For labels there is RAILING_3DLENGTH, but that is the whole railing's length.

In IES individual projected lengths can be listed as Width.

Re: 2D Length for Railing panel?

MinhNguyen — Fri, 25 Aug 2023 02:04:31 GMT

Hi Peter,

That's awesome! I was looking into RAIL2D_FULL_POLYLINE_GEOM but can't figure out how to use it.

If I use RAIL2D_FULL_POLYLINE_GEOM[2][1] - RAIL2D_FULL_POLYLINE_GEOM[1][1] like what I did in the 3D script, unfortunately it doesn't work.

Can you please show me how this command should work?

Thank you so much in advance!

Re: 2D Length for Railing panel?

Peter Baksa — Wed, 06 Sep 2023 07:38:05 GMT

Hi,

sorry for the late reply.

For straight panels you have to use both coordinates with Pythagorean theorem.

Curved panels are not that easy, curves are described with the same format as the Polyoperations addon uses:

* x and y coordinates are the start point of the arc (the end is the next x, y, point)

* the third parameter is the signed central angle of the arc. Here are some illustrations.

The arc length, using trigonometry is: (PI / 180) * chordlength * ((alpha / 2) / sin (alpha / 2))

Re: 2D Length for Railing panel?

MinhNguyen — Wed, 06 Sep 2023 09:52:38 GMT

@Peter Baksa wrote:
.....

For straight panels you have to use both coordinates with Pythagorean theorem.

....

Hi Peter, no worries! Thanks for the information, this is really helpful! Let's focus on straight panel for now, as this was my problem anyway

Now I assume we need the coordinate of 2 points to calculate their distance using Pythagorean theorem

d = sqrt((x2-x1)^2+(y2-y1)^2)

But I can't seem to use RAIL2D_FULL_POLYGON_GEOM to get the coordinates of the 2 points:

- If I use RAIL2D_FULL_POLYGON_GEOM[2][1] - RAIL2D_FULL_POLYGON_GEOM[1][1], I have the following error

- With RAIL2D_FULL_POLYGON_GEOM[1][1] - RAIL2D_FULL_POLYGON_GEOM[1][2], the script is ok, but this is not the value we look for (which should be x2-x1)? And the result is 0.0000 anyway

- Last attempt: if I would consider the first point to be 0,0, and the second point is actually what can be pulled from RAIL2D_FULL_POLYGON_GEOM, then the result of this command

dummy = sqr(RAIL2D_FULL_POLYLINE_GEOM[1][1]^2 + RAIL2D_FULL_POLYLINE_GEOM[1][2]^2) print dummy

is 0.0000 in Report dialog

Thank you once again!

Re: 2D Length for Railing panel?

Peter Baksa — Mon, 18 Sep 2023 11:19:15 GMT

Oh I see. During check script global variables might not be filled with sensible geometric data like they would when the object is placed in the plan.

Check with vardim1 whether the array size is good for your calculations.