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    No collision detected

    AhBadianeAhBadiane Member
    edited March 2013 in General questions
    Hello,

    In this project I'm working on collions
    The test : a ball that moves on the screen and a snake moves on each touch screen
    I watched the example "collision Detection" and incluted the four physics events

    In my project (in the attached file), no collision occurs between the snake and the ball :-S

    I ask a lot, but you have an idea ?
    AhBadiane
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    Comments

    • ScouserScouser Guru
      edited March 2013
      @AhBadiane: After looking at your code, I see a few problems.
      You have no collision filters set up for your snake or ball
      -- Add this line above where you create the snake fixture
-- Snake is object 0x10 & accepts collisions from object 1 (ball)
local filter = {categoryBits = 0x10, maskBits = 1}
-- Now add filter=filter to the end of your createFixture line like so
Self.body[ind]:createFixture{shape = Self.shape, density = 1, restitution = 0.2, friction = 0.3, filter=filter}
 
-- Add this line above where you create the ball fixture
-- Ball is object 1 & accepts collisions from object 0x10 (snake)
local filter = {categoryBits = 1, maskBits = 0x10}
-- Now add filter=filter to the end of your createFixture line like so
self.body:createFixture{shape = self.shape, density = 1, restitution = 0.2, friction = 0.3, filter=filter}
      You are moving the ball yourself, you should apply a force to it and allow box2d to move it using world:step. Without this box2d doesn't know a collision has occurred so cannot call your collision functions

      Likes: ar2rsawseen

      Twitter: https://twitter.com/#!/scouser
      Website: http://www.castlegateinteractive.com
      https://play.google.com/store/apps/developer?id=Castlegate+Interactive
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    • AhBadianeAhBadiane Member
      @Scouser, thank you for your help. I understand the concept of filter.
      But I do not understand the concept of force and not "move it using world: step"

      I am a true beginner, but once turn my project, I would do a little tutorial for beginners like me ;)
      AhBadiane
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    • ScouserScouser Guru
      @AhBadiane, after looking more at your code, I think you're making things more complicated than they need to be with your use of Box2D.

      I would suggest using TNT Collision Engine by @GregBUG.

      I haven't used it myself but from other forum member's comments I understand it will do everything you will want (and probably more besides).
      Twitter: https://twitter.com/#!/scouser
      Website: http://www.castlegateinteractive.com
      https://play.google.com/store/apps/developer?id=Castlegate+Interactive
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    • AhBadianeAhBadiane Member
      @Scouser, I began to look towards TNT Collision and indeed it is much simpler. I will continue with TNT
      Too bad, I wanted to finish without TNT :-((
      AhBadiane
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