io_anim_seanim VS Stop-motion-OBJ

Originally I extracted models in SEModel format and managed to open them in Blender with this script: https://github.com/dtzxporter/io_model_semodel, but I failed to open SEAnim files (animation files) with this script (https://github.com/SE2Dev/io_anim_seanim), but I get this error:

If you want to import them into blender, use Blender Source Tools, and for animations use this SEAnim Plugin.

I have exported a series of .obj files from an external cloth simulation engine. I import them into blender using the Stop-motion-OBJ plugin which converts the objs to a mesh sequence. I apply a material on my cloth using BlenderKit. However at some of the frames the light suddenly changes and the colour of the cloth is completely different from frame to frame. For example from the first to the mid frame and then from the mid to the end frame the lighting changes completely. I use cycles at 128 samples with 0.01 noise threshold. I normally also have HDR lighting but I have turned it off for these renders in order to debug the issue. Here I am only keeping a single area light and I kept the image resolution low for fast rendering, but even with high resolution I get the exact same problem. What could the issue be?

I found https://github.com/neverhood311/Stop-motion-OBJ but it requires a separate .obj file for each frame.

Nope. I used the Stop Motion OBJ addon to load and animate a sequence of meshes. The meshes themselves were generated with an external python script.

I've been thinking about this for a while and I do have a *very* experimental branch that aims to export OBJ sequences to glTF. Here's the link: https://github.com/neverhood311/Stop-motion-OBJ/tree/shape-key-baking but use at your own risk. Basically, it merges every frame of the sequence into a single object, then uses shape keys (AKA morph targets) to switch between frames.

i just imported a sequence of obj files with the Stop Motion OBJ Plugin. Now i would like to convert my obj sequence into a single FBX file that i can use in other 3d software.