void addPElem (const char* const composition, const double cx, const double cy, const double u, const double v, const double rot, const double atten);
void convertToImagefile (ImageFile& im, double dViewRatio, const int in_nsample, const int trace) const;
void addPElem (const char* const composition, const double cx, const double cy, const double u, const double v, const double rot, const double atten);
void convertToImagefile (ImageFile& im, double dViewRatio, const int in_nsample, const int trace) const;