voxels-chunk.xtl

1⍝# Voxels, 1: a chunk is an array. 16 by 16 by 16 block numbers built
2⍝# from a height field in a few array expressions -- grass, dirt, stone,
3⍝# water below a level, sand at its shore, one tree -- then counted,
4⍝# cut and seen from above. (docs/voxels.md; the next demos draw it.)
5⍝# Run: just demo scene voxels-chunk   (pictures go to work/draw/)
6
7ᵛˣ⁼u̲se< "Voxels"
8
9h ← ᵛˣh̲ills 0.0
10"the height field (x across, z down), 3 to 12:"
11h
12b ← ᵛˣc̲hunk h
13s̲hape b
14"blocks of each kind:"
15ᵛˣnames
16ᵛˣc̲ounts b
17
18"the slice at x = 8, looking east (up is up):"
198 ᵛˣs̲ide b
20"the slice at x = 4, through the tree:"
214 ᵛˣs̲ide b
22
23"seen from above (the top block of each column):"
24t ← ᵛˣt̲op b
25t
26p ← ⎕S̲HOW ⎕G̲RID t
27p ← ⎕S̲HOW ⎕G̲RID r̲ev (1 + 8 s̲elect b)
28"drawn: the view from above, the slice at x = 8"