Hi,
I am new to Houdini.just want to know how to map a file texture
to a color parameter.

e.g. I want to map a tex to control the diffuse color base on the
UV coordinate,how to?

thx.

Your shader have to support this. The one you showed doesn't since this a a glass, you know…
But don't worry. It's very easy to prepare your own shaders and once you get used to it you'll wondering how you could ever live without it!

See VOP in Houdini help, and try to find some examples on the forum or odforce.net Once you get VOP shader you can jump into it and see how is built.

cheers,
sy.