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Contraption Builder: complete object/joint settings + sandbox upgrades #21

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Merged
SethMorrowSoftware merged 2 commits into from
Jun 5, 2026
+1,331 −23
Merged

Contraption Builder: complete object/joint settings + sandbox upgrades #21

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64d72f1
Add complete object & joint settings to the Contraption Builder
claude Jun 5, 2026
8f48c5d
Add gravity, rotation, materials, launch, pause/step, motor power & r…
claude Jun 5, 2026
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6 changes: 6 additions & 0 deletions docs/kit-reference.md
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Expand Up @@ -58,6 +58,7 @@ b2kStart
| `b2kQuickStart [gy]` | One call: world + gravity + card-edge walls + start the loop. |
| `b2kStart` / `b2kStop` | Begin / end the simulation loop. |
| `b2kPause` / `b2kResume` | Freeze / resume stepping without tearing down. |
| `b2kStepOnce` | Advance exactly one fixed step (even while paused) — drives a Step button. |
| `b2kIsRunning()` | True while the loop is stepping (not stopped or paused). |
| `b2kAddWalls` | Static walls around the current card edges. |
| `b2kAddGround [screenY]` | A static floor across the card (optionally at a given Y). |
Expand Down Expand Up @@ -188,6 +189,11 @@ helpers or to `b2kRemoveJoint`.
| `b2kRopeLength(joint)` → pixels | Current distance-joint length. |
| `b2kSpring joint, hertz [,damping]` | Make a rope (distance) joint springy. |
| `b2kWeldSpring joint, hertz [,damping]` | Make a weld springy (0 hertz = rigid). |
| `b2kMotorOff joint` | Turn a hinge motor off (free swing). |
| `b2kHingeLimitOff joint` | Remove a hinge's angle limits. |
| `b2kSliderMotorOff joint` | Turn a slider motor off. |
| `b2kSliderLimitOff joint` | Remove a slider's travel limits. |
| `b2kWheelMotorOff joint` | Turn a wheel motor off. |

## Drag & events

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