Collisions - have some questions

Hi
I have some questions regarding collisions.
In my app I'm making groupds of objects, one of these objects is seonsor which is responsible for collision detection. here is the example:

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        local wallObj = display.newGroup()
        
        local picWall = externParams.uiutils.getThemeItemName( theme_id, wall_id )
        wallObj.wall = display.newImage( picWall, true )
        
        wallObj.sensor = display.newImage( "sensor.png" )
        --sensor.alpha = 0
        wallObj.sensor.type = wall_id
        wallObj.sensor.obj = wallObj
        wallObj.sensor.y = wallObj.wall.y + wallObj.wall.height / 2 - wallObj.sensor.height / 2
        
        wallObj:insert( wallObj.wall )
        wallObj:insert( wallObj.sensor )
        
        wallObj:setReferencePoint( display.CenterReferencePoint )
 
        physics.addBody( wallObj.sensor, "static" )
views:898 update:2011/10/4 17:12:07
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