World:setCallbacks

Sets functions for the collision callbacks during the world update.

Four Lua functions can be given as arguments. The value nil removes a function.

When called, each function will be passed three arguments. The first two arguments are the colliding fixtures and the third argument is the Contact between them. The postSolve callback additionally gets the normal and tangent impulse for each contact point. See notes.

The Contacts may be destroyed immediately after the callback is called, so if you want to store their data for use later in love.update, you must cache it.

If you are interested to know when exactly each callback is called, consult a Box2d manual

Making changes to a World is not allowed inside of the beginContact, endContact, preSolve, and postSolve callback functions, as Box2D locks the world during these callbacks.

Function

Available since LÖVE 0.8.0

This method is not supported in earlier versions.

Synopsis

World:setCallbacks( beginContact, endContact, preSolve, postSolve )

Arguments

function beginContact

Gets called when two fixtures begin to overlap.

function endContact

Gets called when two fixtures cease to overlap. This will also be called outside of a world update, when colliding objects are destroyed.

function preSolve

Gets called before a collision gets resolved.

function postSolve

Gets called after the collision has been resolved.

Returns

Nothing.

Function

Removed in LÖVE 0.8.0

This variant is not supported in that and later versions.

Synopsis

World:setCallbacks( add, persist, remove, result )

Arguments

function add

Called when two shapes first collide.

function persist

Called each frame, if collision lasts more than 1 frame.

function remove

Called when two shapes finish colliding.

function result

Called after a collision has been calculated. Note: This callback is not properly bound in LOVE at the time of writing, as a result, this callback does not get called, nor do proper arguments get passed for it.

Returns

Nothing.

Notes

Below are the parameters for the postSolve callback. Note that the numbers of normal and tangent impulse correspond with the numbers of contact points.

function postSolve(fixture1, fixture2, contact, normal_impulse1, tangent_impulse1, normal_impulse2, tangent_impulse2)
-- do stuff
end

See Also

• love.physics
• World
• Contact
• Tutorial:PhysicsCollisionCallbacks

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