Description:
When using LDView in command-line mode with the savesnapshot option, parts stored in the extradir folder are not rendered in the output image, resulting in a blank or incomplete snapshot. This issue also affects the exportfile functionality.

Example:

I have a part my_part.dat stored in the extradir folder.
This part is referenced in a file 123.ldr with the line: 1 378 0 0 0 0 0 -1 0 1 0 1 0 0 my_part.dat.
The extradir parameter is correctly set in LDView.
When opening 123.ldr using the LDView GUI, everything renders correctly.
When running LDView in command-line mode with .\ldview 123.ldr, the rendering is also correct.
However, when using .\ldview 123.ldr savesnapshot="123.png", the generated image is blank.
The same issue occurs with the exportfile option.