On a whim, I’ve tried a new look for the terrain I’m drawing.  This is substantially more expensive to draw, but it’s kind of cool-looking, I think.  If I decide to go in this visual direction, I’ll need to find a faster way to get a similar effect.

(Actually, this is hugely more expensive to draw than it should be;  it’s about double the geometry being rendered, but it’s taking about ten times as long to draw a frame, so I’m assuming that I’ve probably made a silly mistake somewhere in my rendering code)