{"nxcylinder", "nxbox", "nxsphere", ...}? {physical extent of the object along its local axes (after NXorientation) with the center of mass at the local origin (after NXtranslate).}{The meaning and location of these axes will vary according to the value of the "shape" variable. nshapepar defines how many parameters. For the "nxcylinder" type the paramters are (diameter,height). For the "nxbox" type the parameters are (length,width,height). For the "nxsphere" type the parameters are (diameter).}?