buildingSMART Forums

Where and how will my colors be saved in IFC?

Thanks for your detailled analyses. I will inform a dutch reseller of Nemetschek software. Overall, i hope BSA manages to streamline input/output more with color testing to that this INFORMATION is passd though better in the future. Users should not need to know all this technical stuff in the first place

Do you know any IFC Viewer that can show textures? We are trying to introduce textures in IFC’s models by writting the txt format but we don’t know if we are doing well

Textures are mostly mapped witj pgn files.The FBX files stores them. I doubt you will find it for ifc.

IFC has some issues in texture.
I understand your considerations and what are you looking for?
I think soon we will see them, open-source.

IFC supports the use of image files (preferably png) for textures, see IfcImageTexture

I start from a question from @Moult which is so close to what Ms. @pilarjimenez is looking for, “Material Catalog” and mainly “Product Catalog” for COBie

A as oldskool AutoCAD user i see some similarities between “bylayer” “byblock” and “bymaterial”. Simple as that it might be.

I was hoping there is a way to control or change colors in a simple way. It should be made easy. You could use a user defined property “color” with a description.

@Hans_Lammerts - yes, it is similar to that :slight_smile: By the way, BlenderBIM now allows you to pick whether objects are assigned surface styles by object or by material. As far as I am aware, it is the only BIM program which allows you to do this.

@pilarjimenez - sorry, I don’t know of any that supports textures. It is on my to-do list. However, it is possible in BlenderBIM to assign externally defined material files - I have used this to associate external material definitions which have textures as well as complex material setups. Like the ability to assign surface colours by object or by material, BlenderBIM is the only BIM authoring tool that I know is capable of doing this.

Newer version of Allplan IFC and import BricsCAD conforms better color handling. Good! One one crucial part is missing. The diameter of rebar on elements. This is on BricsCAD interface side i think @Moult

Diameter of a rebar:
FreeCAD (should) and Allplan (for sure does) do export the rebars as IfcSweptDiskSolid. Thus the diameter is not a property inside a property set but a geometry information of the shape. Solibri does show this information, CollabZoom not (support is aware of the problem). I do not know about BricsCAD.

Colors:
AFAIK there are two possibilities to give a color to a object:

  • directly to the shape
  • to the material assigned to the object

Allplan for sure has a bug and writes for one object different colors in the material and in the shape. This is easy repeatable. The ifc development management knows about the problem. If they are going to fix it, who knows.
FreeCAD does shown a log message on import of such case. Since I implemented this I have seen more file from other CAD vendors too which shows the same problem. Different colors for material and shape.

BTW: Allplan has ever written an own material for each object. Thus in FreeCAD ifc importer it is possible to merge materials with the same name and color (If not one would end up with thousands of materials). Allplan is aware of this, but AFAIK they are not going to change this behaviour.

cheers bernd

“Diameter of a rebar:
FreeCAD (should) and Allplan (for sure does) do export the rebars as IfcSweptDiskSolid”

I think you understand my initial reply and need for information. We need to have a displayed property in the rebar. I am not an ifc expert but i think the name is Property Set right? Crucial data should be available to a set (array) of same objects (rebar) and on the object itself. Because during further modelling and modeluse the array (block in dwg) should be able to be exploded.

So from a ‘bim’ perspective the same information should be attached on more the one objects. Two sets of objects. The array (batchnumber, amount and diameters,etc etc) but also one level deeper as single rebar. I don’t see this in any bim ‘authoring’ software yest. I am not surprised this is same in ifc import in bricscad. I would think this shortcoming is in the way ifc works on export and import, not on BricsCAD side. They are doing a really great job working on ifc in DWG ! Geometry is very very good in V20. Best i have seen sofar!

I am interested in this too. I am structural engineer too and misse lots of ifc classes and attributes for all kind of objects we put inside the concrete :frowning:

We coul start a disscussion about this in a separate topic specially dedicated to the rebar attributes. Heappily a class for them exists already.

Yes that would be a good idea. :slight_smile: A tru ‘pouring reinforced concrete’ discussion :slight_smile:

I tested the 2017 ifc2x3 (old Allplan) model but it shows no color as expected.
Indicated that it the color is either improved on the Allplan export side or IFC 4 fileformat…

May be it is the software you use to display the ifc. It seams lot of BIMtools and BIMCloudplattforms are not used by Allplanusers which usre reinforcements. Most of the time I start with a new plattform and try an Allplan ifc with reinforcement I sent them the ifc because the plattform or viewer does not support the Allplan reinforcement colors … !

Reinforcement exported to IFC2x3 in Allplan 2018.1 with new exporter.

screen|690x490

BTW, how do you get inline pics?

Hans, can you send me a test file so that I can make sure your colours come through in BlenderBIM?

IFC coloring should be an certified aspect!! It can be important. To make a bold statement here: it’s not good enough ‘fixed down’ Make it like DXF , DWG behaviour. Or some other mechanism. why not??

I just upload images using it rhe button above the textbox bernd. Cheers.

fine simple examples here … https://forum.freecadweb.org/viewtopic.php?f=39&t=40935

1 Like

@Hans_Lammerts. It is a certified aspect under both the IFC2x3 CV2.0 and IFC4 RV1.2 suites.

It might be certified but Allplan, as well as ArchiCAD as well as VectorWorks (I have not tested others) do write the color into the object AND into the material of the object. But these programm write different colors for the object and for the materials. For sure for Allplan the problem is NOT between stair and keyboard. If have found the problem and the ifc management knows the problem. I can not speak for others since I do not use ArchiCAD and VektorWorks but I recive IFC with this problem on a weekly basis and from different Architects.

cheers bernd