NASCAR 25

spiritovod

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Posts: 2990

NASCAR 25

« on: November 13, 2025, 03:21 »

Game: NASCAR 25 (steam page)
UE5 version: 5.5
AES key: in the same place as usual (link)

Mostly supported with specific build from this topic. For general limitations and possible issues please read this topic.

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spiritovod

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Posts: 2990

Re: NASCAR 25

« Reply #1 on: November 13, 2025, 03:47 »

I noticed that most car parts are actually stored in IRM (iRacing meshes), which is probably ported from their previous game format. From brief search I couldn't find any tools for it and added basic support for it to specific build - no special override is required, simply choose proper engine version.

Known issues: Materials are not linked, because they're not explicitly referenced in such meshes. Weights are not processed if present (some meshes are skinned), maybe it's worth to export them with some dummy skeleton. There is certain geometry overlapping/duplication, not sure it's a error or some additional layers for post-processing.

Also note that lods for such meshes are not lods, but different submeshes (can be switched with "L" button). They're processed like that due to format and umodel specifics.

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Jia Enn

Newbie

Posts: 1

Re: NASCAR 25

« Reply #2 on: September 17, 2026, 00:34 »

Hi there, I’m trying to extract the models from NASCAR 26. NASCAR 26 uses Unreal Engine 5.7, and the models are stored as IRM files. I know this UE Viewer version supports the IRM format in NASCAR 25 with UE 5.5, and that version works for NASCAR 25. Do you know if there is a version of UE Viewer that supports UE 5.7 and IRM, or if the NASCAR 25 IRM-supported version could be updated to work with UE 5.7? I’ve been able to identify and parse the IRM files with FModel, but UE Viewer can't open the game because of the UE 5.7, and gives me a "Wrong package tag (00000000)" error when I try to open them. Any help or information about a UE 5.7 and IRM version would be greatly appreciated. Thank you!


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spiritovod

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Posts: 2990

Re: NASCAR 25

« Reply #3 on: September 17, 2026, 16:40 »

@Jia Enn: I've created topic for NASCAR 26 here: https://www.gildor.org/smf/index.php/topic,9446.0.html
It's compatible with umodel in the same way as NASCAR 25, including IRM meshes. If you have questions, please address them to that topic. For games using io store packages (utoc/ucas) you can open and export assets only from within packages, they can't be extracted and used as separate uassets.


« Last Edit: September 17, 2026, 16:42 by spiritovod »	Logged

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