Added omp guards, added a this-> as a workaround to a clang error
Added omp guards, added a this-> as a workaround to a clang error

cloudcompare/PoissonRecon,asmaloney/PoissonRecon,cignoni/PoissonRecon,cignoni/PoissonRecon,cloudcompare/PoissonRecon,asmaloney/PoissonRecon