Hi Siva,
Fire and ice is a 3D extractor from cadence. In order to use Fire and Ice, you need a tech file in .tch format, normally provided by foundry.
in case, the foundry hasn't given a .tch file, we can generate one using the ICT technolgy file using a utility called RCgen which is i guess is provided by cadence in their SoC suite.
Other inputs include a library view of your design (.cl file), DEF file and layer map.
You can use Fire and Ice to model various other process parameters during the extraction process.
I hope this helps.
regards