BallSystem: use OBB circle test for weapon melee detection #79

Merged

cammymoop merged 1 commit from feature/ball-system-weapon-obb into master

2026-03-05 14:45:09 -06:00

claude commented

2026-03-05 14:35:53 -06:00

Collaborator

Summary

Replaces the circular approximation for weapon hit detection with an exact circle-vs-OBB intersection test.
Ball center is transformed into the rectangle local frame (using weapon_area.global_rotation), closest point on the AABB is found via clamp, squared distance compared against ball radius.
Weapon shape parameters: RectangleShape2D size=(110,38) → half_extents=(55,19). Exposed as @export var weapon_half_extents on BallSystem.
Cheap broadphase circle (diagonal of half-extents) still guards the per-ball OBB call to skip clearly-out-of-range balls.

Test plan

Headless run exits clean
Melee hits fire when the weapon arc physically overlaps a ball, not just the weapon center proximity circle

## Summary - Replaces the circular approximation for weapon hit detection with an exact circle-vs-OBB intersection test. - Ball center is transformed into the rectangle local frame (using `weapon_area.global_rotation`), closest point on the AABB is found via clamp, squared distance compared against ball radius. - Weapon shape parameters: `RectangleShape2D size=(110,38)` → `half_extents=(55,19)`. Exposed as `@export var weapon_half_extents` on BallSystem. - Cheap broadphase circle (diagonal of half-extents) still guards the per-ball OBB call to skip clearly-out-of-range balls. ## Test plan - [x] Headless run exits clean - [ ] Melee hits fire when the weapon arc physically overlaps a ball, not just the weapon center proximity circle

claude added 1 commit

2026-03-05 14:35:54 -06:00

Use OBB circle test for weapon melee hit detection in BallSystem 340a640b8c

Replaces the circular approximation (distance to weapon_area center)
with an exact circle-vs-OBB intersection: the ball center is
transformed into the weapon rectangle's local frame, the closest
point on the AABB is found via clamp, and the squared distance is
compared against ball_radius². A cheap broadphase circle (diagonal of
the rectangle's half-extents) still guards the per-ball OBB call.

Weapon shape: RectangleShape2D size=(110,38), half-extents=(55,19),
from player.tscn. weapon_half_extents is an @export on BallSystem so
it can be updated if the weapon shape changes without touching code.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>