NEWBIE : How to use Texture2 node?

As part of my final year project, I am researching into VRML. I have
been 'playing' with it for a couple of months. The one thing I can't
figure out is how to use the texture nodes properly. I wanted to map a
texture of some bricks onto a virtual house, but I couldn't get the scale
right. How do I do this? I presume its something to do with the
TextureCoordinate2 node and Texture2Transform node, but I am not sure How
to use them. How do I actually calculate the texture coordinates from a
jpg image?

TIA

Jon

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