Orkuncakilkaya
56e4b6d688
- ludic.wildlife: WildlifeWorld.push / pushed_x / pushed_z (defaults change nothing); a ground walker's step is slid clear of a still thing with a body from its species' size and scale, and a step that gets nowhere turns away as the water does. Birds are not pushed; no dice added. - ludic.npc: NpcWorld.push / pushed_x / pushed_z (a person 0.35 m round) in npc_walk, and NpcWorld.clear (default true), which npc_line_ok asks at 1 m so a detour does not cut a trunk. - ludic.aim: AimView.clear replaces AimView.ground and the ground march; the pick asks the line a body's width short of where the ray enters the thing (aim_clear_at(t, back)), so a solid thing does not hide itself. probe.ludic (the ground-agreement probe) and AimView.dry are gone. - ludic.photo: PhotoLens.clear replaces PhotoLens.ground, PhotoLens.trunk and the march. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2.7 KiB
ludic.aim
What the crosshair is on, and which thing the use key means. The crosshair is the exact middle of
the screen and the projection is symmetric, so the ray through it is the camera's position along its
forward - no unprojection. Each candidate is an upright cylinder widened by a fixed angular
forgiveness, and the pick is the nearest one the ray enters that nothing hides: the line up to
where the ray enters it is asked of the game (clear), so a thing that is itself solid does not
hide itself. Uses
ludic.base and nothing else.
import "ludic.aim"
The package keeps no list of things: the game offers every candidate each frame (aim_offer), keeps
the object behind the id it gave, and draws the rim and the prompt.
The rule it keeps
The crosshair decides WHICH, the distance decides WHETHER (aim_use(kind)):
| under the crosshair and in reach | AIM_USE_THIS - that, whatever else is nearer |
under the crosshair and too far, within AIM_USE_MAX (10 m) |
AIM_USE_NOTHING - and the prompt says why |
| nothing of that kind aimed at, or aimed past 10 m | AIM_USE_NEAREST - proximity is right again |
Every reach is floored at AIM_REACH_MIN (3 m) by aim_reach_of(reach): a per-kind reach chosen
against its model was never chosen against standing between two props and looking at one. Anything
that asks "am I close enough to this" asks aim_reach_of.
The port
export port AimView {
x, y, z, fx, fy, fz, fov, # the camera (the ray)
clear: fn(ax, ay, az, bx, by, bz) -> bool, # nothing between: the ground and every still thing
body_x, body_z # distances and reach are the body's, not the camera's
}
Every member has a default: a camera 1.5 m up at the origin looking down -z at nothing in the way.
API
aim_begin(), aim_offer(kind, id, x, y0, y1, z, r, reach, far) -> bool |
a frame's candidates: true when this one is now the pick (reach AIM_NEVER is never in reach) |
aim_kind() (AIM_NONE for nothing), aim_id(), aim_dist(), aim_in_reach(), aim_t(), aim_off_centre() |
the pick |
aim_use(kind) -> AIM_USE_THIS / _NOTHING / _NEAREST, aim_reach_of(reach) |
the use key |
aim_ray_cyl(cx, y0, y1, cz, r), aim_slack_m(dist), aim_clear_to(x, y, z), aim_clear_at(t, back), aim_range(x, z), aim_miss(cx, cz, r) |
the geometry, for a game's own probes (aim_clear_at: the ray clear to back short of t along it) |
Tests
ludic test packages/ludic.aim
A camera over flat ground with a ridge: the ray against a cylinder, the forgiveness, near before far, the ridge hiding a thing and a solid thing not hiding itself, the reach floor and the three answers for the use key.