Two bodies could not be connected: no door on a hinge, no lamp on
a rope, no wheel on an axle. This is the first step of the issue,
the four joints without a motor. The slider and the motors follow
in a second step under the same issue.
- Joint is a new asset type, placed as a child of the object it
holds, like a collider or a rigidbody. "Add joint…" in the
object menu makes one or places one the project has. An object
takes as many as it needs.
- Where the joint sits is the point it holds its object at. A
hinge and a fixed joint have that one point only. A spring and a
rope end at a connected anchor on the other object, counted in
that object's own units, or in the scene's without one.
- The rows follow the type: length, stiffness and damping for a
spring, length for a rope, an angle limit for a hinge. Length 0
takes the distance the two ends were placed at. The limit counts
from how the two were placed.
- The connected object is an object reference in the schema of the
type. Pasting, containers and removing treat it as they treat
every reference since #258.
- shownFor is a new schema option: a row is shown while an enum of
the same bag holds one of the named values.
- The object needs a rigidbody, its own or one further up. Without
one the joint holds nothing and the console says so once.
- A connected object without a rigidbody is a moving anchor: the
joint has a kinematic body of its own that follows it.
- A connected object destroyed while playing makes the joint let go
with a hint. Removed in the editor the reference empties, so the
joint holds on to the scene. The issue asked for "inactive" there.
- "Add joint" ties two objects while the game runs, from a joint
asset as the template. Destroy on the joint lets go, there is no
Break joint node. Destroy with keep children takes the joints
along with the object.
- The scene view draws a line from each joint to what it holds on
to and rings the held point. A selected spring or rope has a
round handle on its far end, and dragging it is one undo step.
- Joints hold in Play only. The editor run simulates nothing
(#148), and the inspector of a placed joint says so.
- Rapier counts a revolute joint's limits absolutely, not from the
start, so the placed angle is added. Measured with a probe.
- The + menu has 25 types now and no longer fits under its button
on a canvas 800 high. It scrolls there, and e2e 04 scrolls to
the last entry instead of expecting it in view.
Tests:
- Gate on melektaus-atx for this state: 218 files, 3390 tests
(3336 + 54), exit 0.
- e2e 1-16,24,39-46,51,52,57,58 on melektaus-atx: 831 checks, all
pass. Module 41 alone: 25 checks (21 + 4).
- 54 new unit tests: 40 in joints.test.ts (rope, spring, pendulum,
limit, fixed, the other end, the node, containers, paste), 6 for
the line the scene view draws, 4 catalog cases of the node. The
remaining 4 come from tests that make a case per asset type.
- Four new e2e checks in module 41: Add joint from the menu, the
rope to the hook with its line and handle, dragging the handle
with one undo, the bob hanging in Play next to one that falls.
- e2e 04, 40 and 46 count the new type in their lists.
- 21 of 22 unit counter-probes fail their tests. The other one is
equivalent: Rapier ignores removing a joint that left with its
body, the guard stays.
- Three browser counter-probes fail their checks (2, 1 and 2).
- One screenshot looked at: icon, line, handle and the rope rows.
- The e2e sum of 1691 is counted (1687 + 4, 1687 measured by CI
on e066613). The full suite and the smokes did not run.
- Not seen in the browser: spring, hinge with limit and fixed
joint, the node Add joint, a connected object that moves, joints
inside a container, the released game. Unit tests cover them
but the last. Limits under a mirrored parent are not handled.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
adminandClaude Opus 5.5
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