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feat(editor): add --gen-texture-crackle Voronoi cell-boundary

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78th procedural texture: fine cracks following Voronoi cell
boundaries. For each pixel, the algorithm finds the two
nearest jittered cell centers (across 9 surrounding cells);
the difference between (distance to second-nearest) and
(distance to nearest) approximates distance to the cell
boundary line. Pixels under crackW from the boundary get
the crack color; inside cells get the base.

Distinct from --gen-texture-cracked (wide stone cracks at
large scale via random walk) and --gen-texture-frost
(6-spike crystal rosettes from seeded points) — crackle
is the fine-mud / dry-leather / parched-earth variant for
desert ground / aged-document / drought-cracked-mud zones.

Useful for desert-floor zones, aged-leather armor sections,
parched-earth dungeon floors, dragon-burned ground,
mummified-flesh trim, ancient-document parchment.
This commit is contained in:
Kelsi 2026-05-09 13:56:41 -07:00
parent dc29f7f135
commit 8c79b732e3
3 changed files with 92 additions and 1 deletions
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2
tools/editor/cli_help.cpp
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@ -189,6 +189,8 @@ void printUsage(const char* argv0) {
std::printf(" Pinwheel: alternating colored triangular wedges radiating from center (mandala / wind-rose / wheel inlay)\n");
std::printf(" --gen-texture-scratched-metal <out.png> <baseHex> <scratchHex> [scratchCount] [maxLen] [seed] [W H]\n");
std::printf(" Scratched metal: base color overlaid with N angled hash-derived line segments (worn armor / blades)\n");
std::printf(" --gen-texture-crackle <out.png> <baseHex> <crackHex> [stride] [crackW] [seed] [W H]\n");
std::printf(" Crackle: fine Voronoi cell-boundary cracks (dried mud / parched earth / aged leather)\n");
std::printf(" --add-texture-to-zone <zoneDir> <png-path> [renameTo]\n");
std::printf(" Copy an existing PNG into <zoneDir> (optionally renaming it on the way in)\n");
std::printf(" --gen-mesh <wom-base> <cube|plane|sphere|cylinder|torus|cone|ramp> [size]\n");