how can i make glass for swbf2 in XSI?

You can either add just a glass texture, or preferably, add a glass texture with an alpha texture so that it's translucent.

As well you have to set the transparency flag either in the pandemic flag editor within xsi or you have to hex edit it into your msh file afterwards. There is a tutorial on how to do that in the faq

hmm that`s a bit to hard for me i`ll do that when i have more experience with modding

or just download sketchup make a rectangle and fill it with the glass texture provided... easy enough

well i wanted to make it in XSI and found a way that i can get glass in XSI but when i export it`s not in swbf2 and if you wanna know how just create a blinn and edit the transparency

1. Create your glass object.
2. Create a texture that is blue but mostly transparent.
3. Texture your object, without changing any transparency values. In XSI, it looks opaque.
4. Export via MshEx.
5. Hex the transparency in, according to this tutorial.