transparency in shapes

Ryan,

The photo seems to show simple triangles, each with a stroke and no fill, full opacity/no transparency.

How about just using that?

If by "Lines," you mean Strokes, you can do the following:

1. Select your object, and in the Appearance panel (Window > Appearance), click on the Stroke listing
2. Click the disclosure arrow to the left of the of the Stroke listing to reveal Opacity
3. Change the Opacity Percentage to make just the Stroke Transparent
4. You could also change the Blending Modes used for the Transparency by clicking the arrow to the right of the "Normal" Blending Mode

Hi,

Can you show us any visuals similar to the triangle outcome your are trying to create?

A triangle is just a three segment path. If you have other lines inside that triangle check that they are unrelated (independent) or part of a filling. Thus change View to Outlines to check they are lines, paths, not expanded strokes.

Can you select them separately? Do they have a fill cilor?

To make the fills transparent you may remove the color or pattern used, in the Appearance panel lower their transparency to 0%.

What lines? You need to be much more specific and properly explain what you are actualyl doing. If you are using a specific pattern fill or whatever it may need to be expanded, assuming it's not pixel based, but otherwise your post really doesn't allow anyone to make much sense of it.

Mylenium