Bugs in versions prior to v0.3

Dirty Triangles had some bugs. They probably still have plenty, but here's some chat about 2 bugs that I've found and fixed. The pleasing aspect of both bugs was their visual nature...

Bug #1

Can you spot anything interesting about this image?

What about the same image, after it's run for much longer?

Does it have anything in common with this image?

And with this one?

It took me a while to spot this, but there's much more detail in the top left of each of those images than anywhere else. In fact there's a decreasing amount of detail as you look from the top left to the bottom right of each image.

Once I spotted that I naturally had to figure out what was going on. It turns out a bug in the mutation process caused some of the polygon vertices to have null coordinates, and x = null and y = null is interpreted by browsers as the same as x = 0 and y = 0: that's the top left of the image.

So these poor Dirty Triangles polygons were still managing to make an interesting image despite being handicapped by having many of their vertices pinned to the top left corner...

Here are a few other images where you can see the same bug's effect:

This issue is now fixed, and I've removed the affected images so they don't affect the learning process. However, this bug inspired thought on a possible new feature: the ability to render more detail for certain parts of an image. For example it might be nice to have more detail in faces, as they're areas people tend to look at more carefully. Or more details in the in-focus portions of an image with a narrow depth of field: imagine a picture of an in-focus dog, with many polygons for greater details, against a blurry background with fewer, bigger polygons.

Bug #2

Bug #2 was sporadic, indeed I noticed it in only one image, but was perhaps slightly more obvious. What's going on here?

It turns out that the Dirty Triangles that were trying something new were being saved, rather the best set found. In this case they were trying a particularly bold shade of pink for a certain polygon instead of its previous shade of grey. Given this was a black and white image, the violent pink wasn't a closer match, but that's the point at which the image was saved... oops!

This bug is now fixed, but I kind of liked the effect in this image of a propeller.