Greetings for the day,
Can anyone please help me to know that IFC entities are case sensitive or not.
For example, if I use “ifcproduct” or “IfcProduct” instead of “IFCPRODUCT” in .ifc file it is right or not.
Thank you.
Best Answer
Is the IFC entities are case senstive?
Best answer by jovitaatsafe
Hi @sidhucivil5932,
Thanks for your question! I believe it is case sensitive, and the general rule seems to be camel casing, where the first letter of the word is capitalized like IfcProduct. I ran a quick test changing the casing writing out to IFC and the geometry disappears. The same output with differing casing doesn't read properly in an IFC viewer like DDS-CAD either. Here's some links to check out to read more on it:
- BuildingSmart list of entities for IFC 2x3
- COBie Quality Control excerpt from a search
- and it might be worth checking out the specification/standards from BuildingSMART
- also check out Writing IFC Objects from our IFC reader doc
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+7As far as I know, this is the case (pun intended), yes :)
+11- Safer
- Best Answer
Hi @sidhucivil5932,
Thanks for your question! I believe it is case sensitive, and the general rule seems to be camel casing, where the first letter of the word is capitalized like IfcProduct. I ran a quick test changing the casing writing out to IFC and the geometry disappears. The same output with differing casing doesn't read properly in an IFC viewer like DDS-CAD either. Here's some links to check out to read more on it:
- BuildingSmart list of entities for IFC 2x3
- COBie Quality Control excerpt from a search
- and it might be worth checking out the specification/standards from BuildingSMART
- also check out Writing IFC Objects from our IFC reader doc
Hi @sidhucivil5932,
Thanks for your question! I believe it is case sensitive, and the general rule seems to be camel casing, where the first letter of the word is capitalized like IfcProduct. I ran a quick test changing the casing writing out to IFC and the geometry disappears. The same output with differing casing doesn't read properly in an IFC viewer like DDS-CAD either. Here's some links to check out to read more on it:
- BuildingSmart list of entities for IFC 2x3
- COBie Quality Control excerpt from a search
- and it might be worth checking out the specification/standards from BuildingSMART
- also check out Writing IFC Objects from our IFC reader doc
Thank you @jovitaatsafe for your help.
I will definatly go through these links.
Greetings for the day,
When we create or export IFC file all the entities are in "uppercase" format.
I used IFCOPENSHELL and PYTHON to extract some of the entities from the IFC file and I got the resulting IFC file after extraction having entities in "camelcase" which is before extraction in "caps case". Why?
Also, IFC file having entities in camelcase (which I got after extraction) is not opening in viewers like SOLIBRI MODEL VIEWER and DDS-CAD.
Please help me to understand these.
Thank you.
+11- Safer
Greetings for the day,
When we create or export IFC file all the entities are in "uppercase" format.
I used IFCOPENSHELL and PYTHON to extract some of the entities from the IFC file and I got the resulting IFC file after extraction having entities in "camelcase" which is before extraction in "caps case". Why?
Also, IFC file having entities in camelcase (which I got after extraction) is not opening in viewers like SOLIBRI MODEL VIEWER and DDS-CAD.
Please help me to understand these.
Thank you.
I checked in with a colleague, and my apologies for the confusion. In your workspace in FME Workbench, it should be camelcase, but in the IFC file itself, the feature types are all uppercase.
There's a bit more information on casing from this forum here on IFC.