[pushxtonotdie]

I see that the call stack from the exception shows that the error happens in the Assimp namespace. This namespace is part of the Assimp.Net project that is a third-party wrapper for the native assimp library. I cannot support that library because I am not the author of that library.

Anyway, I assume that the native assimp library cannot correctly read your file and this then produces a null reference exception in the Assimp.Net library. I would advise you to save your model in some different file format. From the attached image I see that the model is quite simple so you may also save it into the obj file format. In this case you would not need to use assimp importer but can simply use ReaderObj class from Ab3d.PowerToys library to read your file.

I’ll check out the .OBJ and see if that imports correctly. The reason I was using the Assimp library was because I need blend shapes and skeletal animations and I think this is the only way to import them. Is there any other way to get the animation data into Ab3d? Afaik obj is just model data only.

Thanks
C