You need to change the program to let us upload images of different sizes than 16,32,64 and 128 pixels. I have sprites of various sizes and that limit is very annoying.
When you're adding the mtl file to be exported alongside obj one?
-Using square sprites of identical dimensions is crucial for precise model creation. Exact pixel placement ensures the model generates correctly, and uniform PNG sizes make calculating these coordinates much easier.
-I will release a new version next week that includes .mtl file support.
Many thanks :)