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MCX Unknown error in MCX

Fischkopp

Fischkopp

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278
Country
germany
Hi Arno and hi everyone on the forum, I could use some help with the error message described below.

I’ve been using MCX for quite a while now to create freeware scenes. Today, however, when I tried to import a DAE model, I received the following error message—one I’ve never seen before—and I’m not sure what to make of it. The message reads:

Error importing file: Unable to resolve library reference “ID496”

Unfortunately, I don’t know what the library reference ID496 is or how I could find out.
The model was built in SketchUp and then exported as a DAE file so I could edit it further in MCX and use it as a GLTF file for MSFS 2020 and 2024.

I’m using version v1.9.2026.0806-devrel

Best regards, Manfred
 
Hello:

Not Arno here, but based on past issues with MCX' implementation of the ASSIMP 3D model inter-conversion library code having occasional problems with Collada *.DAE files, I would first try exporting the 3D model from Sketchup as a Google *.KMZ file.

Other export formats are also available in Sketchup's default options, and yet others are available to be used via free plugin Ruby scripts.

I suspect MCX may import the *.KMZ 3D model in question without an error, assuming it does not have a serious internal 3D structural anomaly,

Which numeric / year version of Sketchup was the 3D model created in ?

GaryGB
 
Last edited:
Would you be able to share the model with me so that I can test it? I suspect it is either something in the Assimp library or the DAE file has some invalid content.
 
Interesting to see Google AI updated itself since just this morning on this subject (search Google via this query string)

Code: 
ASSIMP Error importing file: Unable to resolve library reference ID 496

GaryGB
 

@GaryGB​

Hi Gary, thanks for your quick reply.

You're right—the MCX imports the model without any problems in KMZ format. However, this also textures the interior surfaces, which I didn't want in MSFS for performance reasons.

The model was created in SketchUp 2020.


@arno
Hi Arno, thanks to you, too, for your quick reply.
Yes, I can send you the model or a link to download it. It’s a very simple barracks building with no major special features. I’ll send you the download link via private message.

I’ve been working with MCX for years now, but I’ve never had a problem like this before. After the barracks building, I built a few bike shelters with transparent glass walls and was able to import them into MCX as DAE files without any problems. Very strange.


In MCX imported as KMZ file
Kasernengebaeude.jpg
 
I’ve now started troubleshooting as well, exporting all groups and objects individually as DAE files and trying to import them into MCX. Except for one group, it worked without any problems for all of them.
The problem therefore seems to lie in one of the two long walls (see image). It must really be the wall itself, because I was able to open the windows, doors and lamps in MCX without any issues.

Hauswand.jpg
 
OK, I recreated the wall in question, and now it's working perfectly. But I don't know what the exact problem was.
 
Good to hear you fixed it. I will still take a look at the file you send me to check where the error comes from. I suspect SketchUp made an invalid file, but it would be better if Assimp ignored the missing reference instead of throwing an error.
 
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