Hi, guys

I want to make some blocks (which represent glass) transparent. How can I do that? I know I can make a material file whose alpha is ,for example, 50 and attach it to the block ,but I don't know how to do it....

Also, I want to make a block transparent without adding a material as I want to keep its texture......

So, there are two questions here:
1) How to make a block transparent using a material file as I don't know how to create a material file?

2) How to make a block transparent without using materials?


Thank you for reading & any help would be appreciated