The total quality of a 3D output has several dependencies.
First, the resolution of the images used for your texture or decal.
Second, your models UVs, which are the way the model flattens into 2D space for images to map onto the surface.
And finally, your output size (the resolution the image will render at).
Note: Vector formats like AI and SVG will rasterize at their current size on import.
To improve the quality of your images, you can:
- Check the size of original vector files (AI/SVG) and use a large enough size.
- Choose Object > Export UVs to check the UVs of your object. The area you are applying a graphic to may not have enough UV resolution. In this case, you may have to manually UV your object in a modeling application.
- Check the resolution of your texture or decal compared to your output size. If you are rendering at large resolution but using small textures, that will lead to blurry renders.