61 lines
1.8 KiB
TypeScript
61 lines
1.8 KiB
TypeScript
import { interactionGroups } from "@react-three/rapier";
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import type {
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QueryFilterFlags,
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Ray,
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Vector,
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World,
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} from "@dimforge/rapier3d-compat";
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interface RapierApi {
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readonly Ray: new (origin: Vector, direction: Vector) => Ray;
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readonly QueryFilterFlags: {
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readonly EXCLUDE_DYNAMIC: QueryFilterFlags;
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readonly EXCLUDE_KINEMATIC: QueryFilterFlags;
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};
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}
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type WorldPosition = readonly [number, number, number];
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export const DUNGEON_LINE_OF_SIGHT_GROUP = 15;
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export const DUNGEON_PHYSICAL_COLLISION_GROUPS = interactionGroups(0);
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export const DUNGEON_SIGHT_BLOCKER_COLLISION_GROUPS = interactionGroups(DUNGEON_LINE_OF_SIGHT_GROUP);
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export const DUNGEON_WALL_COLLISION_GROUPS = interactionGroups([0, DUNGEON_LINE_OF_SIGHT_GROUP]);
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export const DUNGEON_SIGHT_QUERY_GROUPS = interactionGroups(
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DUNGEON_LINE_OF_SIGHT_GROUP,
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DUNGEON_LINE_OF_SIGHT_GROUP,
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);
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const ACTOR_SIGHT_HEIGHT = 1.05;
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const TARGET_MARGIN = 0.08;
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/**
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* Checks only the dedicated wall/pillar collision layer. Walkable terrain and
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* ceilings remain physical, but never participate in combat visibility.
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*/
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export function hasDungeonLineOfSight(
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rapier: RapierApi,
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world: World,
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start: WorldPosition,
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end: WorldPosition,
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): boolean {
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const dx = end[0] - start[0];
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const dy = end[1] - start[1];
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const dz = end[2] - start[2];
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const distance = Math.hypot(dx, dy, dz);
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if (!Number.isFinite(distance)) return false;
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if (distance <= TARGET_MARGIN) return true;
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const ray = new rapier.Ray(
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{ x: start[0], y: start[1] + ACTOR_SIGHT_HEIGHT, z: start[2] },
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{ x: dx / distance, y: dy / distance, z: dz / distance },
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);
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const hit = world.castRay(
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ray,
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distance,
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true,
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rapier.QueryFilterFlags.EXCLUDE_DYNAMIC | rapier.QueryFilterFlags.EXCLUDE_KINEMATIC,
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DUNGEON_SIGHT_QUERY_GROUPS,
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);
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return !hit || hit.timeOfImpact >= distance - TARGET_MARGIN;
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}
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