Alpha texture

How place alpha texture on object. Is it doing in 3d modelling program or in .sco file? And how could I make glass effect?

Thank you for response.

About creating glass effect - watch this topic

Thank you, it works now. But I have another problem.

I made my own traffic light. But lights aren't visible at night like on original traffic lights by Marcel. How set texture of lights if I want permanent brightness for all day.

Thanks for response

Please respone for my question. It's very important for me to now where is problem.