Making a side of a cube "see through"

Support Basics & Interface
1

I understand how to assign different materials to a single mesh. What I would like to know how to do is to make one side of a cube “see through”. Meaning that in my image I don’t want to see one of the sides of my cube. It would be like a box with the top removed. Can someone explain how I would do this or point me to a tutorial that explains this?

2

Deleting the top face would be the most obvious. But, if you want it to be transparent then give it a material different to the rest of the cube and turn the Alpha slider in the Material tab all the way down. In the MapTo tab map it to Alpha and in the MirrorTransp tab turn on either ZTransp or RayTransp depending on whether you’re using Raytracing.

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3

Thanks for your help!