Forum Post: export Powercivil file to Lumenrt,exsiting black area

I build a design grounding , which existing triangular， to express the Channel Model,and then loaded a surface template on the design grounding,the feature of surface template is Concrete.I exported it from Powercivil to Lumenrt，and it some black area exist in the Moedel,I want to ask how to solve it. The Model made in Powercivil in Picture two；the other is exported fie in Lumenrt。 Thank you a lot！