about 'setVertexZ' problem

cocos2d-x C++
#1

this is lua code

testSprite(sceneGame,"soldier.plist", "soldier.png", "S_Walk%02d.png", 6, 420, 320, 1, true)
testSprite(sceneGame,"helicopter.plist", "helicopter.png", "H_Walk%02d.png", 6, 480, 320, 0.5, false)


function testSprite(parent, plist, png, param, total, posx, posy, vertexz, shader)


    local cache = CCSpriteFrameCache:sharedSpriteFrameCache()

    cache:addSpriteFramesWithFile(plist)
    local spritebatch = CCSpriteBatchNode:create(png)


    parent:addChild(spritebatch)
    local m_pSprite = CCSprite:createWithSpriteFrameName( string.format(param, 0))

    if shader == true then
        spritebatch:setShaderProgram(CCShaderCache:sharedShaderCache():programForKey( 'ShaderPositionTextureColorAlphaTest' )); 

        spritebatch:getShaderProgram():setUniformLocationWith1f(spritebatch:getUniformLocation("CC_alpha_value"), 0)
    end

    m_pSprite:setPosition(posx,posy)

    spritebatch:addChild(m_pSprite)

    m_pSprite:setVertexZ(vertexz)

    local animFrames = CCArray:createWithCapacity(total)
    for i = 0,total-1 do 
        local frame = cache:spriteFrameByName( string.format(param, i) )
        assert(frame ~= nil, string.format(param, i))
        animFrames:addObject(frame)
    end

    local animation = CCAnimation:createWithSpriteFrames(animFrames, 0.05)
    m_pSprite:runAction( CCRepeatForever:create( CCAnimate:create(animation) ) )
end

and it become this: see pic 1

but what i want is this: see pic 2
and I just modify this

testSprite(sceneGame,"helicopter.plist", "helicopter.png", "H_Walk%02d.png", 6, 480, 320, 0.5, false)
testSprite(sceneGame,"soldier.plist", "soldier.png", "S_Walk%02d.png", 6, 420, 320, 1, true)


20130606233232.jpg (22.6 KB)


20130606233824.jpg (17.0 KB)