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ludic.nav (18.1): a DetourCrowd per kind of walker

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The shim builds DetourCrowd from the same pinned Recast & Detour tag. nav_crowd_start puts a crowd on a kind's mesh, with the mesh's tastes as its filters. Walkers are added (snapped to the mesh), sent and sped through verbs, stepped together, and read back into nav_agent_*. nav_crowd_us times the stepping with the OS clock. Dropping a mesh drops its crowd first. On the test meadow, twenty walkers crossing head-on never come closer than their two radii (0.7003 m), all arrive, and a step costs about 12 us. nav 15/15 on the Mac and the PC; the DLL still imports KERNEL32 alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-28 00:24:30 +03:00
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@ -71,3 +71,13 @@ across the seams, a tile under water with no polygons, and the set saved and loa
`native/build.sh` fetches Recast & Detour v1.6.0, checks its SHA-256, and builds Recast, Detour
and the shim (`native/shim/nav_shim.cpp`) into `lib/<target>/` - the same script on the Mac and on
the PC (Git Bash, the LLVM installer's clang). `native/LICENSE-recastnavigation` ships with it.
## Crowds (phase 18)
`nav_crowd_start(kind, max, max_radius)` puts a DetourCrowd on a kind's mesh, with the mesh's tastes as
its filters. `nav_crowd_add(kind, x, y, z, radius, height, speed, filter)` adds a walker (snapped to
the mesh, -1 off it), `nav_crowd_target` and `nav_crowd_speed` say where and how fast, and
`nav_crowd_step(dt)` steps every crowd. `nav_crowd_read` puts a walker into `nav_agent_x/y/z/vx/vz`,
and `nav_crowd_us()` is what the stepping has cost. The mechanic decides and the crowd moves, and
dropping a mesh drops its crowd first. On the test meadow, twenty walkers crossing head-on never come
closer than their two radii, and a step costs about 12 us.