The Triangles generator renders a line pattern. The junction points are arranged in a triangle grid.

If you want to get a regular grid (Image 2), set the Amplify value to 0. The grid will be distorted if you increase the value (Image 1).

The number of junction points is manipulated by the Tiling parameters. Increase the values for a finer grid.

With the Object Radius attribute you can change the width of the lines relative to the smaller side of the texture.