Everything you need is here. If it still works in FME 2020.

https://community.safe.com/s/question/0D54Q000080hcNASAY/3d-shapefile-with-3dforcer

As for the coordinate unit modifier, just use a reprojector with the coordinate system you want, in m

Thank you for your answer.

Do you mean that Long/Lat coordinate system is not supported by 3DForcer and Extruder?

It is supported, as it only adds another dimension without any modification to the others. I just thought you wanted everything to be in meter.

Thank you for your reply.

I would like to use the 2d Shapefile data of Long/Lat coordinate system with Z value as meter.

Could you tell me the setting for those data?

I don't quite understand what you mean by that but I will try

You have your reader, that you must connect to the 3DForcer. It's parameter "elevation" will be your floor level. Take care of the way your data is written, if it is in the format "12 m" for example, use a string replacer with your floor attribute to replace as the m and do not touch the replacement text, leave it empty.

Then use an ExpressionEvaluator and create a new attribute roof_heigth or anything recognisable as a name, which value is simply your roof minus your floor attributes.

Finally, you can use the extruder with a Direction "vertical" and a distance "roof_heigth" or your newly created parameter. That is it

I do not know if I understood correctly, and if not, specify more while asking again

Thank you for your help. 

I found INSPECTOR could not support such data with Long/Lat horizontal coordinate sysytem and meter vertical value.

I can display the results another viewer correctly.

Thanks,