Bug: M3D model import failures due to texture problems

[tellypresence]

(Note: .m3d format has been deprecated, but the importer still works for some models so reporting problems for future reference)

Error reports and screenshots reflect assimp 20 Oct 2024 commit e4ef891

Bug details

(Updated) This problem was caused by M3D code attempting to access private implementation details in stb_image, which were not available due to the manner in which assimp has set up stb_image implementation to be created in a dedicated central location, which means assimp will "play well" with other projects, but restricts individual projects from accessing private implementation details.

Models which fail to load due to textures

Category	Model	Error message
Geometry	SG Atlantis	Validation failed: aiTexture::pcData is nullptr
	Fantasy Castle	Validation failed: aiTexture::pcData is nullptr
Vehicle	ATAT Walker	Validation failed: aiTexture::pcData is nullptr
Spaceship	BSG Viper	Validation failed: aiTexture::pcData is nullptr
	X-Wing	Validation failed: aiTexture::pcData is nullptr

Models which load OK

Models without textures, bones or animations, tend to have more success...

Category	Model	Screenshot
Geometry	Medieval Castle
Vehicle	Mad Max's V8

#5834 discusses model which fails to load due to zero meshes
#5837 discusses rigged and animated models which fail to load due to node/bone problems