[Bin Yong Choo]"I have already pasted the 3dimport plugin into the effects folder. Do i need to install something else??"
Did you install the Camera Importer plugin while AE was running? If you did, then you need to restart AE for AE to initialize the plugin. There is nothing else that you need to do other than placing the plugin into AE's main plugins folder.
Intensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects ACE/ACI (version 7)