Hi @piercexc, FME supports both reading LAS format data and writing OBJ format data, but the OBJ format doesn't support point cloud whereas a LAS file stores a point cloud, so you will have to transform the point cloud from the LAS file into a surface that is a geometry type supported by the OBJ format. For example, the TINGenerator transformer would be a quick way to transform a point cloud into a TIN surface.

Check FME 2017 betas for a PointCloudSurfaceBuilder based on PCL coming soon. Also chime in on this idea if you have additional scenarios you'd like us to consider. Definitely processing is needed to get from LAS to OBJ...