How do I get this fill effect?

Question

How to achieve this fill effect or fill pattern ?

I tried creating a halftone screen, rasterizing, and replacing the dot with a triangle (via script), but the effect I got wasn't the same.
Obviously, the object to which I apply this fill doesn't have to have a particular shape like the one in the attached file, which vaguely resembles a trapezoid.
How would you achieve this fill?

thx for your help

Monika Gause · Accepted Answer

Try Inkscape Tiled clones like this:Or Halftonemaker.com

Bobby Henderson · Answer

When I open the attached triangle fill.PS file I see triangles as the halftone shape, not trapezoids. Anyway, Illustrator doesn't have a stock effect for creating true vector-based halftones.

Astute Graphics has a Phantasm plugin which can create vector-based halftones, but it only does so using a few pre-defined shapes. None of them include triangles. I haven't figured out a way to use custom shapes with Phantasm's halftone effect. Phantasm does do some pretty cool things, but it is limited in some other regards.

CorelDRAW has a built-in Pointillizer effect. It can't do nearly as many things as the Phantasm Illustrator plugin, but it can make halftone patterns using custom shapes, such as triangles.

In either case, both of those effects filters generate halftone where the dot shapes are laid down in uniform patterns. They don't have options to make every other dot or every other row of dots flip 180 degrees. Due to some inconsistencies in how the triangles are placed I suspect the pattern might have been built up by hand.

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