Modifying the world within the locked callback functions

[borix134]

So, I would like to call a function that modifies the world within the collision callbacks:

Code: Select all

function land(ship_fixture,planet_fixture)
	ship_fixture:getBody():setAngle(1/(math.cos(ship_fixture:getBody():getX()-planet_fixture:getBody():getX()-planet_fixture:getShape():getRadius())))
end
function beginContact(a, b, coll)  --when the objects initially collide, ship is a
	if a:getUserData()=="ship" then
		a:getBody():setLinearVelocity(0,0)
		land(a,b)
	end
end
function endContact(a, b, coll) --when the objects stop touching
--null
end

function preSolve(a, b, coll) --while the objects are touching
--null
end

function postSolve(a, b, coll, normalimpulse1, tangentimpulse1, normalimpulse2, tangentimpulse2) --dont know what the f*** this is
--null
end

Anywho, I dont really want to use hardon collider, because I am already using physics, and would not want to re-enter all the shapes into the module, as well as risk performance when the callback functions already know when the objects collide. What would be the best way to modify the world whlist triggered by a beginCallback() function?

[Azhukar]

What would be the best way to modify the world whlist triggered by a beginCallback() function?

Depends on what you want to modify.

You also have a bug waiting to happen:

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if a:getUserData()=="ship" then

You are not guaranteed that A will be ship, B can be ship while at the same time A is something else. You have to always first determine which of the two fixtures is which.