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‎_data/examplesindex.json‎

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"title": "Box2D Chain Terrain",
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"twitter_image": "https://www.defold.com/examples/physics/box2d_chain_terrain/thumbnail.webp"
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},
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{
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"author": "Defold Foundation",
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"brief": "Create and control a motorized Box2D joint from script using Box2D V2 and V3.",
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"category": "physics",
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"layout": "example",
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"opengraph_image": "https://www.defold.com/examples/physics/box2d_motor_joint/thumbnail.webp",
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"path": "physics/box2d_motor_joint",
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"scripts": "box2d_motor_joint_v3.script, box2d_motor_joint_v2.script",
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"tags": "physics, box2d",
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"thumbnail": "thumbnail.webp",
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"title": "Box2D Motor Joint",
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"twitter_image": "https://www.defold.com/examples/physics/box2d_motor_joint/thumbnail.webp"
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},
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{
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"author": "Defold Foundation",
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"brief": "Create a mouse joint that pulls dynamic bodies toward a moving target.",

‎_includes/examples/physics/box2d_motor_joint/box2d_motor_joint_v2_script.md‎

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local TOUCH = hash("touch")
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local MOTOR_SPEED = 1.5
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local MAX_MOTOR_TORQUE = 50000
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local function update_label(self)
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local direction = self.direction > 0 and "counter-clockwise" or "clockwise"
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label.set_text("#label", string.format("Box2D V2 motor joint\nMotor: %s\nClick or touch to reverse", direction)) -- <1>
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end
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local function set_motor_speed(self)
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b2d.joint.set_motor_speed(self.joint, self.direction * MOTOR_SPEED) -- <2>
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update_label(self)
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end
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local function reverse_motor(self)
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self.direction = -self.direction -- <3>
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set_motor_speed(self)
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end
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function init(self)
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self.direction = -1
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local b2d_version = b2d.get_version() -- <4>
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self.active = b2d_version.major == 2 -- <5>
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if not self.active then -- <6>
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return
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end
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msg.post(".", "acquire_input_focus") -- <7>
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local pivot_position = go.get_position("pivot") -- <8>
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local arm_position = go.get_position("arm")
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local pivot = b2d.get_body(msg.url(nil, "pivot", "collisionobject")) -- <9>
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local arm = b2d.get_body(msg.url(nil, "arm", "collisionobject")) -- <10>
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b2d.body.set_gravity_scale(arm, 0.0) -- <11>
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local arm_anchor = vmath.vector3(
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pivot_position.x - arm_position.x,
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pivot_position.y - arm_position.y,
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pivot_position.z - arm_position.z
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) -- <12>
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self.joint = b2d.joint.create_revolute(pivot, arm, { -- <13>
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local_anchor_a = vmath.vector3(),
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local_anchor_b = arm_anchor,
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enable_motor = true,
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max_motor_torque = MAX_MOTOR_TORQUE,
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motor_speed = self.direction * MOTOR_SPEED,
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collide_connected = false,
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})
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update_label(self)
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end
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-------------------
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-- Input handling:
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function on_input(self, action_id, action)
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if not self.active then -- <14>
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return
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end
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if action_id == TOUCH and action.pressed then -- <15>
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reverse_motor(self)
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end
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end
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function final(self)
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if not self.active then
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return
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end
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if self.joint then
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b2d.joint.destroy(self.joint) -- <16>
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self.joint = nil
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end
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msg.post(".", "release_input_focus") -- <17>
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end
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--[[
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1. Updates the label with the active backend and the current motor direction.
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2. Sets the motor speed on the revolute joint through the Box2D joint API.
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3. Reverses the stored motor direction before applying the new speed.
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4. Reads the active Box2D backend version.
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5. Enables this script only when the project is running the Box2D V2 backend.
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6. Stops the script early when Box2D V2 is not active.
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7. Acquires input focus so this script can receive click or touch input.
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8. Reads the editor-placed pivot and arm positions used to calculate the local joint anchor.
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9. Gets the Box2D body from the static `pivot` collision object.
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10. Gets the Box2D body from the dynamic `arm` collision object.
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11. Disables gravity on the arm body so the example focuses on the joint motor.
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12. Converts the pivot world position into the arm's local space using the editor positions. This keeps the arm rotating around the visible pivot.
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13. Creates a revolute joint with its motor enabled. The revolute joint provides the pivot, while the motor drives the rotation.
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14. Skips input handling if this script is inactive.
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15. Handles a click or touch press and uses it to reverse the motor direction.
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16. Destroys the runtime-created joint during cleanup.
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17. Releases input focus when the script or collection is unloaded.
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]]

‎_includes/examples/physics/box2d_motor_joint/box2d_motor_joint_v3_script.md‎

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local TOUCH = hash("touch")
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local MOTOR_SPEED = 1.5
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local MAX_MOTOR_TORQUE = 50000
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local function update_label(self)
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local direction = self.direction > 0 and "counter-clockwise" or "clockwise"
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label.set_text("#label", string.format("Box2D V3 motor joint\nMotor: %s\nClick or touch to reverse", direction)) -- <1>
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end
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local function set_motor_speed(self)
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b2d.joint.set_motor_speed(self.joint, self.direction * MOTOR_SPEED) -- <2>
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update_label(self)
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end
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local function reverse_motor(self)
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self.direction = -self.direction -- <3>
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set_motor_speed(self)
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end
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function init(self)
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self.direction = -1
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local b2d_version = b2d.get_version() -- <4>
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self.active = b2d_version.major == 3 -- <5>
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if not self.active then -- <6>
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return
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end
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msg.post(".", "acquire_input_focus") -- <7>
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local world = b2d.get_world() -- <8>
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b2d.world.set_gravity(world, vmath.vector3()) -- <9>
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b2d.world.set_joint_tuning(world, 60, 1.0) -- <10>
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local pivot_position = go.get_position("pivot") -- <11>
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local pivot = b2d.get_body(msg.url(nil, "pivot", "collisionobject")) -- <12>
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local arm = b2d.get_body(msg.url(nil, "arm", "collisionobject")) -- <13>
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b2d.body.set_gravity_scale(arm, 0.0) -- <14>
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local arm_anchor = b2d.body.get_local_point(arm, pivot_position) -- <15>
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self.joint = b2d.joint.create_revolute(pivot, arm, { -- <16>
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local_anchor_a = vmath.vector3(),
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local_anchor_b = arm_anchor,
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enable_motor = true,
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max_motor_torque = MAX_MOTOR_TORQUE,
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motor_speed = self.direction * MOTOR_SPEED,
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collide_connected = false,
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})
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update_label(self)
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end
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-------------------
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-- Input handling:
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function on_input(self, action_id, action)
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if not self.active then -- <17>
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return
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end
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if action_id == TOUCH and action.pressed then -- <18>
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reverse_motor(self)
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end
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end
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function final(self)
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if not self.active then
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return
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end
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if self.joint then
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b2d.joint.destroy(self.joint) -- <19>
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self.joint = nil
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end
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msg.post(".", "release_input_focus") -- <20>
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end
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--[[
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1. Updates the label with the active backend and the current motor direction.
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2. Sets the motor speed on the revolute joint through the Box2D joint API.
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3. Reverses the stored motor direction before applying the new speed.
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4. Reads the active Box2D backend version.
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5. Enables this script only when the project is running the Box2D V3 backend.
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6. Stops the script early when Box2D V3 is not active.
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7. Acquires input focus so this script can receive click or touch input.
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8. Gets the current Box2D world handle.
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9. Clears world gravity so the arm stays in the editor-placed setup.
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10. Tunes the Box2D V3 joint solver used by the motorized joint.
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11. Reads the editor-placed pivot position, which is the world point the arm should rotate around.
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12. Gets the Box2D body from the static `pivot` collision object.
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13. Gets the Box2D body from the dynamic `arm` collision object.
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14. Disables gravity on the arm body so the example focuses on the joint motor.
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15. Converts the pivot world position into the arm's local space using the V3 body helper. This keeps the arm rotating around the visible pivot.
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16. Creates a revolute joint with its motor enabled. The revolute joint provides the pivot, while the motor drives the rotation.
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17. Skips input handling if this script is inactive.
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18. Handles a click or touch press and uses it to reverse the motor direction.
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19. Destroys the runtime-created joint during cleanup.
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20. Releases input focus when the script or collection is unloaded.
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]]

‎examples/animation/3d_animations/archive/archive_files.json‎

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‎examples/animation/3d_animations/archive/game0.arcd‎

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‎examples/animation/3d_animations/archive/game0.projectc‎

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repeat_delay = 0.5
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repeat_interval = 0.2
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gamepads = /builtins/input/default.gamepadsc
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gamepad_database = /builtins/input/gamecontrollerdb.txt
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gamepad_deadzone = 0.2
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game_binding = /input/game.input_bindingc
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use_accelerometer = 1
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‎examples/animation/3d_animations/dmloader.js‎

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var EngineLoader = {
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arc_sha1: "",
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wasm_sha1: "",
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wasm_size: 2825791,
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wasmjs_sha1: "",
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wasm_pthread_sha1: "",
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wasm_pthread_size: 2000000,
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wasmjs_pthread_sha1: "",
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wasmjs_pthread_size: 250000,
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wasm_file: "/examples/wasm/1cb2daded744b16282557ec3e42d9dc2.wasm",
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wasm_pthread_file: "/examples/wasm/1cb2daded744b16282557ec3e42d9dc2.wasm",
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wasm_file: "/examples/wasm/62d49d3a1e25642da4df5a1f75e1ac68.wasm",
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wasm_pthread_file: "/examples/wasm/62d49d3a1e25642da4df5a1f75e1ac68.wasm",
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wasmjs_file: "/examples/wasm/29c6d3b0c9d07e47c3b76094bdc73808.wasm.js",
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wasmjs_pthread_file: "/examples/wasm/29c6d3b0c9d07e47c3b76094bdc73808.wasm.js",
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wasm_instantiate_progress: 0,
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stream_wasm: "false" === "true",
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var Module = {
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engineVersion: "1.13.1",
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engineSdkSha1: "070624ab8bd5e66a84a580312557d9f44fcec700",
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engineSdkSha1: "a17be93c6c9ac834117c95e94d874f72574e8f88",
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noInitialRun: true,
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_filesToPreload: [],

‎examples/animation/animation_delay/archive/archive_files.json‎

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