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An ideal version of the eraser would have an adjustable eraser radius, maybe even with a softness feature so that points on the periphery of the eraser radius only have a chance of being erased. The one downside is that the triangulation point eraser can only erase a single point at a time. In my opinion, this is the only implementation worth using. With that file, if you decide to go back and edit the image, you can re-import point locations and continue from where you left off, or even transfer point locations to another image. One additional great feature is the ability to save the triangulation point locations to a text file.

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This means that you can save it to a PDF and bring it into other software like Adobe Illustrator for further editing. Image Triangulator can export final images to vector or bitmap formats. Other comparable software usually makes these features paid (or lacks them entirely), but Image Triangulator is completely free, and works on both Windows and MacOS. The triangulated mesh is even visible and calculated in real-time, making you aware of the result with each movement of the mouse, before any points are set. This is my favorite implementation that I’ve tried due to it’s easy of use, useful keyboard shortcuts, and ability to dynamically generate triangulation points based on adjustable sliders. Some are better than others, and I’ll go over some of the better known implementations below.

Implementations have been made that can even apply this style to videos.

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There are various programs out there (both free and paid) that can aid in creating these Illustrations, or even generate them automatically.

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Van Gogh’s Starry Night, triangulated using DMesh How to make these Illustrations:

This is why the label of ‘low-poly’ is often applied to this style of Illustration. It conveys a minimal, geometric look that mimics the triangular polygons that often comprise 3D models made in software such as Blender. The end result is this ‘minimalist, polygonal’ style that can carefully be adjusted to concentrate detail in important area of an image (such as eyes, other small features of a subject), and leave unimportant areas of the image as large, flat-colored triangles. Original photo by Rowan Chestnut on Unsplash

The color of each triangle is determined by automatically averaging pixel color of all pixels contained within that triangle in the original image.

Delaunay triangulation avoids making any triangles with small angles whenever possible, and instead seeks to equalize all angles whenever possible. Which points are connected to form which triangles is determined by maximizing the smallest angle of all the angles of the triangles.

A mesh of points is generated (by hand or automatically) and triangles are drawn from these points.

How does it work?Īt its basic level, here’s how the software works: They used Delaunay triangulation (named after mathematician Boris Delaunay) to generate or aid in the creation of these types of Illustrations.

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Some took a manual approach, carefully plotting and drawing the individual triangles by hand, some clever (or perhaps lazy) designers took a shortcut. A lot of different designers and digital artists gave this style their own shot. There was a trend not too long ago in the design world with minimalist illustrations consisting of triangles.

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