Hello Doug,

Thanks for your kind help.

I am trying to understand your suggestion in the original email.

Are you suggesting me using the member function 
"transform_unit_to_real_cell()" to get all support points in a unit cell? 
In the step, sort out the face points I need? Am I correct?



On Sunday, June 21, 2020 at 5:00:35 PM UTC-7, Doug Shi-Dong wrote:
> Hello Lex,
> You were close.
> https://www.dealii.org/current/doxygen/deal.II/classMapping.html#ae5df63553eb8ed170c3b90524853dd48
> The project_real_point_to_unit_point_on_face() is useful is you take a 
> "volume" point within the cell. Since you are mapping from unit to real, 
> you would always know whether your point is on the face or not.
> Therefore, transform_unit_to_real_cell() should do the trick. Unless you 
> somehow actually need to project a "volume" point, but projecting within 
> unit cell is easy, which you would then follow with 
> transform_unit_to_real_cell().
> Best regards,
> Doug
> On Saturday, June 20, 2020 at 8:16:22 PM UTC-4, Lex Lee wrote:
>> Hello Deal.II Users,
>> I want to get the physical (geometry) coordinates for support points on 
>> cell faces. Also I know that there are such member functions that can me 
>> map points between reference and real cells in this link: 
>> https://www.dealii.org/current/doxygen/deal.II/classMapping.html . 
>> However, via the link mentioned above, I only find a member function 
>> called project_real_point_to_unit_point_on_face 
>> <https://www.dealii.org/current/doxygen/deal.II/classMapping.html#a078f4e617fdb287e1dc7a5efa227b0ae>
>>  (real 
>> to unit) , no functions like project_unit_point_to_real_point_on_face 
>> (unit to real).  
>> Could someone kindly tell me how I can solve this problem?  
>> Regards,
>> Lex

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