Gravity, ray cast, and Scene Document round trip for physics Components (#73) #105

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crowmaki merged 2 commits from issue-73-gravity-raycast-roundtrip into main

2026-09-07 00:50:21 +00:00

crowmaki commented

2026-09-07 00:48:58 +00:00

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Closes #73.

The box3d Plugin publishes set_gravity, gravity and ray_cast on the Physics Interface. The ray cast normalises the direction, asks Box3D for the closest hit, and reads the Rigidbody Handle from the body's user tag; an Implicit Static Body sets its tag to null explicitly so its hit reports a Null Handle.

Five Headless tests in tests/core/box3d_plugin_test.odin, one per acceptance criterion:

zero gravity holds a dynamic cube still and reads back
a ray straight down onto the plane reports a Null Handle at the plane's top
a ray through a cube reports its Rigidbody Handle and a shorter distance
a ray that hits nothing reports no hit, both pointing away and too short
a saved Scene Document holds the authored fields and no transient ids, and loads into a fresh Engine whose cube falls

The document round trip needed no Plugin change: Core's transient flag already keeps body, static_body and shape out of the document.

Closes #73. The box3d Plugin publishes `set_gravity`, `gravity` and `ray_cast` on the Physics Interface. The ray cast normalises the direction, asks Box3D for the closest hit, and reads the Rigidbody Handle from the body's user tag; an Implicit Static Body sets its tag to null explicitly so its hit reports a Null Handle. Five Headless tests in `tests/core/box3d_plugin_test.odin`, one per acceptance criterion: - zero gravity holds a dynamic cube still and reads back - a ray straight down onto the plane reports a Null Handle at the plane's top - a ray through a cube reports its Rigidbody Handle and a shorter distance - a ray that hits nothing reports no hit, both pointing away and too short - a saved Scene Document holds the authored fields and no transient ids, and loads into a fresh Engine whose cube falls The document round trip needed no Plugin change: Core's transient flag already keeps `body`, `static_body` and `shape` out of the document.

crowmaki added 2 commits

2026-09-07 00:48:58 +00:00