message: Expand relative source paths in run_tests.sh
diff: # to run: ./run_tests.sh <path to ospray source>
  # a new folder is created called build_regression_tests with results
  +if [ -z "$1" ]; then
  + echo "usage: run_tests.sh <OSPRAY_SOURCE_DIR>"
  + exit -1
  +fi
  +
  +# Expand relative paths.
  +SOURCEDIR=$(realpath "$1")
  +
  mkdir build_regression_tests
  cd build_regression_tests
  mkdir failed
  -cmake $1/test_image_data
  +cmake ${SOURCEDIR}/test_image_data
  make -j 4 ospray_test_data
  