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    limiting revolute joint question

    mykyl66mykyl66 Member
    edited November 2011 in Announcements
    I am using this code and have two objects attached. I am now trying to limit the rotation but keeping getting a nil value for setlimits.

    Any ideas where I am obviously going wrong.

    local myJoint = b2.createRevoluteJointDef(myMan.body, myArm.body, randX-50 , randY)
    myJoint:setLimits(1,1)
    myJoint:enableLimit(true)
    --local myJoint = b2.createDistanceJointDef(myMan.body, myArm.body, randX, randY, randX-50, randY)
    myworld:createJoint(myJoint)

    Mike
    What would you do for your other half?

    http://www.sharksoupstudios.com
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    Comments

    • atilimatilim Maintainer
      edited November 2011
      Joint definition tables are just ordinary Lua tables without any functions or metatable. Therefore you just set the fields of them and pass the joint definition table to the createJoint function.

      After you create your joint definition table with createXXXJointDef function, you directly set the limits
      local myJointDef = b2.createRevoluteJointDef(myMan.body, myArm.body, randX-50 , randY)
myJointDef.enableLimit = true
myJointDef.lowerAngle = angle1 * math.pi / 180
myJointDef.upperAngle = angle2 * math.pi / 180
      and then create your joint
      local myJoint = myworld:createJoint(myJointDef)

      Optionally, you can set the limits after creating the joint:
      myJoint:enableLimit(true)
myJoint:setLimits(angle1 * math.pi / 180, angle2 * math.pi / 180)
      (I know it's not very clear at first sight :) )
      http://en.wikipedia.org/wiki/Cytorus
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    • mykyl66mykyl66 Member
      Right. I think I understand it now. :)

      Mike
      What would you do for your other half?

      http://www.sharksoupstudios.com
      +1 -1Share on Facebook
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