The aspect of AR objects with Sceneform seems more polygonal than without (using OpenGL).
For my tests I have used ARCore samples with and without sceneform and for example with this 3D Object.
Is there a way to smooth it ? Adding more light ?
Thanks
Your question is too poor. No details, no images, no reproducible code...
Asides bugs or implementation details on a library the most common case of "more polygonal aspect" is the shading method and interpolation techniques.
Check that sceneform (filament at the end) and your OpenGL implementation are using the same shading method.