How'd you go about it?

[winter estuary]

so you start with a single voxel wide line fully coloured in, with the tringles sticking off both sides

then you colour in the top tip of one of the white triangles

it will automatically colour in one of the white triangles next to it as well. if it fills a triangle on the left, go left next. if it fills triangle on the right, go right next and fill in teh next tip of the white triangle

then keep going, colouring the tip of every other white triangle

using narrow mod, inhibitor mod, terrain analyzer. on build mode

[turbid holly]

Oh that's simpler than i thought, nice