Sorted:

problem about ray-picking-Collection of common programming errors

problem about picking-Collection of common programming errors

problem about out-of-band-Collection of common programming errors

problem about k-means-Collection of common programming errors

problem about gql-Collection of common programming errors

problem about curvycorners-Collection of common programming errors

problem about cpu-cycles-Collection of common programming errors

issues while installing Opencv library for PHP-Collection of common programming errors

OpenCV 2.4 : undefined reference to cvRand-Collection of common programming errors

linker error with opencv2.1 in devcpp windows 7-Collection of common programming errors