Hellow, help me please, is inexperienced in Houdini. How I make a material reflective in the VEX?

thanks

If you're talking about raw VEX (and not VOPs) and simple shader writing theory, you could read this: http://odforce.net/tips/shaderwriting1.php [odforce.net]
… it's a little dated but it still may have some useful tips for beginners.

when I create one Lighting Model Material, it does not have refleção attributes.
I am usuario of the XSI, in Rendertree, the Material already has reflection attribute.

I am thankful

There's a seperate reflective light vop that you can use to add in reflections to the basic lighting model. Or if you are in pure vex land then its the reflectlight function, check it out in the help.
You can also look at the reflective vop and if you bring up the type properties for it and look in the vex code tab, outer code sub tab that might help too.

Why wasn't the online help searched? I just did one and the “Reflective VOP” looks like the easiest way to me. Put one down and connect “color” output to the “diff” input of your Lighting Model node. To see the results in the shader ball, make sure you turn on the background in the bottom toolbar (which is normally closed by default).