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3D Movement in Cubic Grids

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Hi,
I would like to do a simple movement effect for a grid of cubes. I would like to move a cube in a grid a specified distance, then after few seconds, it should go back to its initial position. I've written few codes, but the cube can go only forward but can't move back.
 void ocvCaptureApp::update() { if( mCap &amp;&amp; mCap.checkNewFrame() ) { ci::Surface surface(mCap.getSurface()); cv::Mat input( toOcv( surface ) ); cv::Mat sobel; cv::Sobel(input, sobel, CV_32F, 1, 1); if(numBlocks==0) return; int h = input.rows / temp; int w = input.cols / temp; float pos; for (int r = 0; r<temp; r++)="" {="" for(int="" c="0;" c<temp;="" c++)="" cv::scalar="" weight="cv::sum(sobel(cv::Range(h*r," (r+1)*h),="" cv::range(c*w,="" (c+1)*w)));="" if="" (weight[0]="" +="" weight[1]=""> colorThershold) // if motion is detected { input(cv::Range(h*r, (r+1)*h-1), cv::Range(c*w, (c+1)*w-1)).setTo(cv::Scalar(0,0,255)); // put a red color in the cube pos = cubes[r][c].Get_Position().y; // get its position pos-=x; cubes[r][c]._pos.y=pos; if(cubes[r][c]._pos.y&lt;-40.0f ) // if its lower than -40 { cubes[r][c]._pos.y=-40.0f; savedY = cubes[r][c]._pos.y; mTimer.start(); bEffect=true; } } if(mTimer.isOver(delayThershold) &amp;&amp; bEffect==true) { pos = cubes[r][c].Get_Position().y; pos+=x; cubes[r][c]._pos.y=pos; if(cubes[r][c]._pos.y&gt;=savedY) { cubes[r][c]._pos.y=savedY; mTimer.stop(); mTimer.reset(); bEffect=false; } } } } mTexture = gl::Texture(fromOcv(input)); } } 

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