Wishes forum
cancel
Showing results for 
Search instead for 
Did you mean: 

shadows on adjoining properties elevation

Sinisa Lazarevic
Participant
It would be great to be able to have shadow casted onto elevation of object taking into account object behind the section line. Council's here require shadow diagrams showing elevation of adjoining property and shadow casted by our proposal onto it.
20 REPLIES 20

Rob
Graphisoft
Graphisoft
a little workaround here (not always applicable though):
map adjoining property with glass material and turn Transparency in Shading ON in 3D window settings. Put section behind the adjoining property (so you will see the elevation of your building through). Then unlink the section and delete all undesired lines.
::rk

Sinisa Lazarevic
Participant
Thanks Rob for your tip. I was using the same tehnique for a while as well as the one listed 4-5 years ago with casting shadow onto bright coloured neigbhour and copying and pasting shadow fills without calculating overlapping feels. But as you know how many times does our Council ask for those elevational shadows (I am from Sydney as well). I dream of day when I can draw section/elevation line looking to neigbhour and say: Give me the shadows, please, and from there go get myself cup of coffee instead of deleting extra lines

Rob
Graphisoft
Graphisoft
I know it is a problem (I have been involved in an argument between a developer and unnamed North Shore council over such diagrams couple years ago). I vote 'essential' however this is a tough one programmerwise. It requires redefining the section/elevation definition as we know it in AC8.1. Anyway it would be fantastic to produce complete facade overshadowing analysis especially when Sydney councils have started to be so hysteric about that issue.
::rk

stefan
Booster
What if you would put a rendered elevation behind the line drawing?
Or do I completely miss the point?
--- stefan boeykens --- architect-engineer-musician ---
ARCHICAD25/Revit2022/Rhino7/Unity2021/Solibri
MBP2019:i9Octo2.4GHz32GBVega20/BigSur+Win11
ARCHICAD-user since 1998

Anonymous
Not applicable
Hi everybody,

I'd like to know whether there are updates regarding this topic. The last post was from 2004...

Does anybody know if there is any way to obtain (easily) the shadows of adjoining properties on elevations?

Many thanks

Laszlo Nagy
Community Admin
Community Admin
Still not possible, see this thread for a possible workaround:

http://archicad-talk.graphisoft.com/viewtopic.php?t=48853
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Anonymous
Not applicable
Thank you, Laszlo.

I'll give it a go; however I still hope that one day the AC developers will find another easier way...

Laszlo Nagy
Community Admin
Community Admin
In that other thread there was a link to a YouTube video which showed an easier way. But for some reason the YouTube video is gone.
Basically consider the following scenario where the higher Walls cast shadows to the Lower Walls. This is how it looks in 3D Axonometry.
You want to create a section line between the two walls facing the lower walls. This way the higher walls will be behind the section line and their cast shadows are not calculated.
SectionShadowsFromWallsBehind.png
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Laszlo Nagy
Community Admin
Community Admin
What you need to do is create a 3D Parallel Projection from the same direction as the Section.
In the 3D Window Settings you will need to select Vectorial Engine (not OpenGL), select the Shading mode, and turn on Sun Shadows.
SectionShadowsFromWallsBehind2.png
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Laszlo Nagy
Community Admin
Community Admin
Now you need to draw a Marquee around your generated 3D and press CTRL+C to copy to the Clipboard. This is when the Copy Dialog comes up which lets you set exactly how you want to copy those lines and fills.
Select the options you see in the attached image. The most important ones are "Scaled Drawing", and "Overlapping Polygons". The Overlapping Polygons options will copy all Shadow polygons generated by the program in 3D to the clipboard.
SectionShadowsFromWallsBehind3.png
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Laszlo Nagy
Community Admin
Community Admin
Now you can paste this into your Elevation. Only the Shadow polygons will be pasted. In the below image I pasted the shadow polygons and also moved them 8000 mm up so I can take a look at them and sort out the ones I need.
This is the good thing about the "Overlapping Polygons" setting: it will copy and paste all shadow polygons. Apparently those shadow polygons that were not visible in the 3D Window were generated by ARCHICAD, but were hidden behind other Walls. This is how to get their geometry.
SectionShadowsFromWallsBehind4.png
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Laszlo Nagy
Community Admin
Community Admin
In this example I needed only the one shadow that is lighter than the others. I can move that one back to its proper position in the Elevation, maybe bring it forward in the Display order and it is done. I can just delete the other pasted shadow polygons that I don't need.

The reason some of the shadow polygons were different in color was because they were cast on different surfaces. If you change the Surfaces prior to generating the 3D with shadows, then after copy-paste, it will probably be easier to select using Find & Select only the polygons you need. This of course applies only if it is tedious to select the needed polygons manually because of there are many complex and overlapping pasted shadow polygons.

I think this is easier to do than to explain so it should not take more than 2 minutes.

Unfortunately, if the geometry behind the Section line changes, you will have to redo this.
It may be a good idea to place these pasted shadow polygons on a separate layer for easier management.
SectionShadowsFromWallsBehind5.png
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Anonymous
Not applicable
I'm currently facing the same issue with council requesting sun shadows on neighbouring elevations. I followed your method, however, couldn't paste the hidden overlapping shadows. It only pasted the visible shadows in the parallel view. Any update on this? Looks like this may have been working in AC20 and may have been phased out in AC21?? Any help would be much-appreciated Thanks!

Laszlo Nagy
Community Admin
Community Admin
Is the 3D Viewpoint using the Vectorial Engine?
It will not work with the OpenGL Engine.
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Anonymous
Not applicable
Are there any updates on this? I have set up some basic slabs in AC20 and the overlapping polygons work. Same setup in AC22 and they do not?

Laszlo Nagy
Community Admin
Community Admin
Could you post a screenshot of the exact issue you are experiencing?
....................................................................................................
Get Archicad Tips at https://twitter.com/laszlonagy
AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC25
Loving Archicad since 1995

Anonymous
Not applicable
sbyrnes wrote:
I'm currently facing the same issue with council requesting sun shadows on neighbouring elevations. I followed your method, however, couldn't paste the hidden overlapping shadows. It only pasted the visible shadows in the parallel view. Any update on this? Looks like this may have been working in AC20 and may have been phased out in AC21?? Any help would be much-appreciated Thanks!
I'm experiencing the same thing.

We recently upgraded from AC19 to AC22 and now in 22 it does not work any more - it only pastes the visible shadows. I went back and tested the method in 19 to make sure I wasn't going crazy and it worked perfectly with all overlapping fills from hidden elements in different colours as usual pasted into the elevation view.

This is a really important part of most development applications these days and this technique has been an office standard that no longer works.

Daniel Kovacs
Graphisoft
Graphisoft
Hi,

I looked into this issue, and apparently the "Overlapping Polygons" option stopped working in ARCHICAD 21, and they produce the same result as "Calculate Split Polygons". I let the Developers know about this, hopefully they will be able to fix it soon (task #266367 in our system).

As a workaround I would try something like what Rob suggested. If you take the elements in the foreground in the 3D Vectorial window, override them all to 'Glass - Clear Fast' (using any method you'd like: e.g. Graphic Override Rules), and then copy the shadow polygons like that, you can get the entire covered shadow.
I tried it this way, it seems to be working like this.

Regards,
Daniel Alexander Kovacs

Professional Services Consultant

GRAPHISOFT



For Troubleshooting and useful Tips & Tricks visit

Anonymous
Not applicable
Hi Daniel,

For some reason I did not get a notification of your reply so this is a bit out of date now but we could not get any method to work so had to resort to a manually drafted shadow elevation. Luckily this was a simple little job and that was feasible but for a bigger more contentious job we would be pretty stuck without the tried and tested copy and paste of overlapping polygons method.

I just went back and tried your override to glass method and could not get it to work either. In vectorial 3d I can see the shadow on the side of the glass wall that it is being cast on, but when I navigate behind the wall to do the copying I can't see it and it is not picked up by the copy command.

Am I missing something?

Pat

Start a new conversation!

Still looking?

Browse more topics

Back to forum

See latest solutions

Accepted solutions

Start a new discussion!