/**
** Set Volume Color
**/
void setVolumeColor(int volid, std::vector<double> greylevel,
std::vector<double> red,
std::vector<double> green,
/**
** Set Volume Color
**/
void setVolumeColor(int volid, std::vector<double> greylevel,
std::vector<double> red,
std::vector<double> green,