@Markiyan Hirnyk 

Thanks a lot !

It is really useful, but I find it hard to generalize to any geometrical object. For instance, I would like to replace the simple plan, by a cylinder (propagation and reflection of a spherical wave inside a cylinder):

I am not sure how to do that with the procedure you gave previously. Any idea?

Thanks again for your help.

Thanks a lot !

It is really useful, but I find it hard to generalize to any geometrical object. For instance, I would like to replace the simple plan, by a cylinder (propagation and reflection of a spherical wave inside a cylinder):

I am not sure how to do that with the procedure you gave previously. Any idea?

Thanks again for your help.