Thanks for your answers, I still have problem with running MASON in my windows 7. I followed the instructions in the tutorial0 but it does not work for me. I mean, when I click on mason.bat (for Quick start) in start folder only the command prompt window come and go very fast and nothing else happen. Also I did not know which file I should download for JAVA3D in ORACLE's website.
I will be appreciated if someone help me with these issues,