Not sure what you mean by "quality is low." Do you mean it's rather pixelated or coarse?
Two things to check:
1) make sure your UV map(s) are exported as 16 bit or floating point from your 3D system.
2) make sure your project (for example, within AE) is set to 16 bit or floating point.
If you continue to have problems, send us a sample project (AE, Nuke, etc.) and some UV maps and source texture map(s) so we can take a look. You can send that to us at techsupport (at) revisionfx (dot) com.