Dear All, I am trying to do the following in my code. I am stuck with not being able to few steps. Can you please suggest if there are any api calls which I can use. Or areas of code which does the same. Take Multi-region element, Loop through each element in the multi region. Loop through each face of element of multi region. Get 2D element expansion of each face and its coefficients. End each face loop. End each element loop. Question(1) To get the 2D element expansion, I am able to use GetfaceExp() on Expansion3D. This only works for boundary elements when the field is Cont3DExp. When element is not in the boundary it gives a segmentation fault 11. - Is this supposed to work ? Question(2) I can overcome the above problem by initializing the field as DisCont3DExp, while loading from fld file. (This seems to work for now). - Is there a function to get each face's Expansion coefficients from element expansion coefficients ? - Or should I dynamically check if the element is Hex, Tet, prism and try to figure out from the mapping order? Thank you,