lua - how to prevent a ball from floating over the ground in corona sdk -

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i have image (ground) transparent pixels on top of since ground has hills ups , downs ... problem ball isn't moving down , according hills ... ball floating on image. can ??

local bg2 = display.newimage("images/ground.png",true) bg2:setreferencepoint(display.centerleftreferencepoint) bg2.x = 0; bg2.y = _h/1.25;  local physics = require("physics") physics.start()  local redorb = display.newcircle( 0, 0, 25) redorb:setfillcolor(255,0, 0) physics.setgravity(0,9.8) redorb.x = 180; redorb.y = 190; redorb.rotation = 5  physics.addbody( bg2, "static", { friction=0.5, bounce=0.3 } ) physics.addbody( redorb, { density=3.0, friction=0.5, bounce=0.3 } )

when add body image has transparency , not automatically make body image itself.

you can use tool physics body

http://www.codeandweb.com/physicseditor

http://www.codeandweb.com/blog/2012/05/24/getting-started-with-coronasdk-and-physicseditor-tutorial

to view actual physics body can add code

physics.setdrawmode("hybrid")

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