D-Day, of course, the 6th of June, the beaches at Normandy. By this time all those decades ago a whole day of death and bloody persistence had- ‘happened’ doesn’t cut it, ‘gone by’ doesn’t either. Been gutted out, bled out, guttered out.

I want to go punch a nazi, which, conveniently, we now have in abundance... 8-(

Half a drabble on Normandy, I need to make progress on my peeps to today but I can’t resist splatting out something about procedural rivers, dongma? 8-P

Now for a river we need elevation, area and precipitation. The area is draining to the sea or at least to a lower elevation, there is an area receiving some precipitation in the form of rain, snow, hail (dew? any other forms to mention?), which for my sins can be represented as a triangle running downhill to the lowest corner; even a polygon as triangle fan will drain into the center from higher vertices and out a lower vertex. I can subdivide a canvas four ways to some random interior point and have all the corners be some random elevation, then make the new point randomly higher or lower than the average of the corners. Each daughter triangle is a watershed which drains from the highest side to the lowest point, except in practice this triangle gets further subdivided and it can be endlessly, delightfully complicated! The drainage point has a certain volume based on precipitation and drainage area, which is important when we link up flow downhill along the edges of triangles further downhill.