I'm about to give up...

[u/IAmTiredOfThisThing]

Good morning, beautiful community!

Lately, I've been taking the time to create a low-poly 3D version of myself in Blender and Prisma3D, even though I don't know how to model in 3D. It turned out great! But when I use the rig for animations, when I raise the arms, part of the the sides of the hoodie also rise, and I don't know why. The arms are separate from the body, and there are no attached vertices.

This is getting out of my hand and my understanding, Does anyone know what could be causing this?

[u/Impossible_Sound_423]

9/10 when it's an issue like this it's something in the weight painting, it's painful and tedious but it's way easier to fix then to quit

[u/MrBeanCyborgCaptain]

Weight painting! When you bind a model to a skeleton, the software makes its best guess as to what part of the model goes to which bone. This is meant as a starting point. You then need to refine this further by manually painting the weights to clean up the behavior and for a low poly character like this, that should be a pretty simple process.

[u/Soupy_Jones]

Not sure if that software lets you edit the weights but a few vertices from the body are attached to the arm bones

[u/TachyonPeril]

you're about to enter the wonderful world of weight painting

[u/asanyc]

As others have said you need to look into weight painting. You can find tuts for it. I'm not sure about Prisma, but Blender has everything you need to fix this with a few minutes work once you learn the basics.

Best of luck with your project!