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

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opened 2026-09-05 09:37:00 +00:00 by crowmaki · 0 comments

crowmaki commented

2026-09-05 09:37:00 +00:00

Owner

Parent

Part of #67.

What to build

The Physics Interface answers queries and the Components survive a document round trip. set_gravity and gravity read and write the world's gravity. ray_cast takes an origin, direction and maximum distance and reports the nearest hit's Rigidbody Component Handle (Null for an Implicit Static Body), point, normal and distance. A Scene Document saved after adding Rigidbody and Box_Collider holds their authored fields and no body or shape id, and loading it into a fresh Engine with the physics Plugin recreates the bodies and simulates.

Acceptance criteria

Setting gravity to zero stops a dynamic cube from falling; reading it back reports the value set.
A ray cast straight down onto the plane reports a Null Handle and a point at the plane's top; with a cube in the way it reports the cube's Rigidbody Handle and a shorter distance.
A ray that hits nothing reports no hit.
A saved Scene Document contains the authored fields and no transient ids; a load into a fresh Engine produces a cube that falls.
Every test runs Headless in the core suite.

Blocked by

#71 A cube falls onto a plane

## Parent Part of #67. ## What to build The Physics Interface answers queries and the Components survive a document round trip. `set_gravity` and `gravity` read and write the world's gravity. `ray_cast` takes an origin, direction and maximum distance and reports the nearest hit's `Rigidbody` Component Handle (Null for an Implicit Static Body), point, normal and distance. A Scene Document saved after adding `Rigidbody` and `Box_Collider` holds their authored fields and no body or shape id, and loading it into a fresh Engine with the physics Plugin recreates the bodies and simulates. ## Acceptance criteria - [ ] Setting gravity to zero stops a dynamic cube from falling; reading it back reports the value set. - [ ] A ray cast straight down onto the plane reports a Null Handle and a point at the plane's top; with a cube in the way it reports the cube's `Rigidbody` Handle and a shorter distance. - [ ] A ray that hits nothing reports no hit. - [ ] A saved Scene Document contains the authored fields and no transient ids; a load into a fresh Engine produces a cube that falls. - [ ] Every test runs Headless in the core suite. ## Blocked by - #71 A cube falls onto a plane

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2026-09-05 09:37:10 +00:00

crowmaki referenced this issue from a pull request that will close it,

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

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

crowmaki referenced this issue from a commit

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

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

crowmaki closed this issue

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