Added weld joint example.

physics/box2d_weld_joint/all.texture_profiles

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+path_settings {
+  path: "**"
+  profile: "Default"
+}
+profiles {
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+    max_texture_size: 0
+    premultiply_alpha: true
+  }
+}

physics/box2d_weld_joint/box2d_v2.appmanifest

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physics/box2d_weld_joint/box2d_v3.appmanifest

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physics/box2d_weld_joint/example.md

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+---
+tags: physics, box2d
+title: Box2D Weld Joint
+brief: Create Box2D weld joints from script so separate dynamic bodies behave like one rigid assembly.
+author: Defold Foundation
+scripts: box2d_weld_joint.script
+thumbnail: thumbnail.webp
+---
+
+This example creates two Box2D weld joints at runtime between three separate dynamic square bodies.
+They form an L-shaped cluster and are put inside a static wall box.
+The weld joints keep the pieces together, while the whole assembly collides and bounces.
+
+Click or touch the screen to kick one of the welded bodies upward and watch the whole cluster react.
+
+There are no differences in scripting between Box2D V2 and V3 in this example.
+
+## What You'll Learn
+
+- How to get Box2D body handles from Defold collision objects
+- How to create rigid weld joints with `b2d.joint.create_weld()`
+- How local weld anchors define where two bodies are attached
+- How changing one welded body's velocity affects the whole connected cluster
+
+## Setup
+
+The collection contains
+- `controller` game object with the script and a label with information text
+- three game objects: `center`, `right`, and `lower` with dynamic collision objects and visual sprite representations
+- a single `walls` game object with static collision object that surrounds the play area with floor, ceiling, and wall shapes.
+
+The 3 separate Defold collision objects are arranged in an L shape,
+with 80 px square sprites and matching box collision shapes.
+Each block has restitution set to 1.0 so the welded cluster keeps bouncing against the surrounding walls.
+Because a weld joint does not turn the blocks into one true compound rigid body,
+they remain separate dynamic Box2D bodies connected by a constraint solver,
+so even if a block has restitution: 1.0, energy can still be lost thorugh weld joint constraint or damping.
+
+![setup](setup.png)
+
+The `game.project` of this example is configured to build with `/box2d_v3.appmanifest` by default.
+To test V2 locally after downloading the example,
+change `Native Extensions -> App Manifest` in `game.project` to `/box2d_v2.appmanifest`.
+
+## How It Works
+
+The script starts by getting the bodies owned by the collection-authored collision objects using `b2d.get_body()`.
+The script stores the handles for `center`, `right`, and `lower`.
+
+Then it calls `b2d.joint.create_weld()` twice - one weld joint from `center` to `right`, and another from `center` to `lower`.
+Each weld joint uses `local_anchor_a` and `local_anchor_b` so the neighboring squares are joined at their touching edges.
+
+The example uses only the rigid weld fields shared by both backends:
+`local_anchor_a`, `local_anchor_b`, `reference_angle`, and `collide_connected`.
+V2 also supports `frequency` and `damping_ratio` for soft welds,
+while V3 uses separate linear and angular hertz/damping fields.
+Those backend-specific spring fields are intentionally omitted here so the same script can run on both backends.
+
+Input focus lets player clicks or touches the screen.
+The script changes the linear and angular velocity of the `right` block.
+The weld joints transfer that motion through the connected bodies,
+so the whole L-shaped assembly kicks upward and spins while remaining rigid.
+