Missing elements in 3d model

[JanoSlivka]

Hello,

I can show ifc file tzb_ifc4.zip with bim surfer 3 and bim server 1.5.172. In 3d model missing few elements, show images:

BimSurfer3

Solibri

Thanks for help

[rubendel]

About 79 objects in this file are causing errors in IfcOpenShell (which can be seen in the geometry generation report). I don't think this is a viewer problem, moving to BIMserver repository.

[hlg]

This issue will be resolved with the next plugin version for IfcOpenShell: opensourceBIM/IfcOpenShell-BIMserver-plugin@732da23. As an immediate workaround, the engine version can be changed in a running BIMserver instance through the IfcOpenShell plugin's settings. The setting Commit Sha would have to be changed to "3bbdc3f".

[JanoSlivka]

This issue is not solved by IfcOpenShell plugin's "3bbdc3f". Elements are still missing.

[hlg]

Yes, you are right, even with the very latest IfcOpenShell version (commit SHA 81ad689), there are about 28 entities failing. This seems only partially solved.

[zaqifathis]

Tested with the latest IfcOpenShell-BIMserver plugin (commit 179e960). Total about 28 elements/entities (IfcDuctFitting, IfcDuctSegment, IfcPipeFitting) are still missing.

and I get this error message from Geometry generation report:

java.lang.Exception: Missing objects in model (...)
	at org.bimserver.geometry.GeometryRunner.run(GeometryRunner.java:833)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)

[hlg]

The exception "Missing objects in model" means that IfcOpenShell was not able to generate geometry for these entities (see BIMserver IfcOpenShell plugin read.me. I went through all of the failing entities' geometries and found that they are faulty in two categories.

1. All the IfcPipeFitting and IfcDuctSegment entities as well as half of the IfcDuctFitting entities have geometry of type IfcExtrudedAreaSolid, IfcExtrudedAreaSolidTapered or IfcRevolvedAreaSolid and profiles of type IfcCircleHollowProfileDef where the WallThickness is 0. This is invalid geometry because WallThickness should be of type IfcPositiveLengthMeasure, hence greater than zero.
2. The remaining IfcDuctFitting entities have geometry of type IfcExtrudedAreaSolid where the Depth is 0. This is invalid as well for the same reason (must be of type IfcPositiveLengthMeasure, hence greater than zero).

Apparently, other software such as Solibri accepts (at least some of) the invalid geometries although this might lead to downstream issues. The errors of the second type would not make a visible difference, no matter whether other software accepts these faulty entities.

I would suggest to close this as I do not expect IfcOpenShell to change the behaviour in this regard. On the contrary, with a thorough schema validation, such files could even be rejected upon checkin.

[hlg]

There is a new issue to include this particular IfcOpenShell setting in the render engine configuration potentially: opensourceBIM/IfcOpenShell-BIMserver-plugin#17.