# Appending Delaunay output

**URL:** https://discourse.vtk.org/t/appending-delaunay-output/6429
**Category:** Support
**Created:** [August 19, 2021, 6:56pm UTC](https://discourse.vtk.org/t/appending-delaunay-output/6429 "2021-08-19T18:56:02Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![noel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/n/0ea827/32.png) [@noel](https://discourse.vtk.org/u/noel)
#### Post date: [August 19, 2021, 6:56pm UTC](https://discourse.vtk.org/t/appending-delaunay-output/6429/1 "2021-08-19T18:56:02Z")

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Hi all,

I am creating a curved surface and to tightly control the triangulation I apply the vtk Delaunay stepwise. I would then like to connect everything as one to later export it as an STL or vtk file. I have tried using the vtkAppend filter but I get the error message that vtkDataObject is required instead of a vtkAlgorithmOutput. Does anyone have any suggestions how i can triangulate stepwise but only get one result output?  
Thanks in advance.