# How to describe a surface with an inner hole？ **URL:** \ **Category:** HOOPS Visualize Web\ **Tags:** how-to\ **Created:** [February 13, 2025, 5:25am UTC](https://forum.techsoft3d.com/t/how-to-describe-a-surface-with-an-inner-hole/4383 "2025-02-13T05:25:40Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![820110017](https://avatars.discourse-cdn.com/v4/letter/8/bc79bd/32.png) [@820110017](https://forum.techsoft3d.com/u/820110017)\ **Post date:** [February 13, 2025, 8:53am UTC](https://forum.techsoft3d.com/t/how-to-describe-a-surface-with-an-inner-hole/4383/2 "2025-02-13T08:53:59Z")
I found this: > [@How-To: Using SC::Store::Utils::TriangulateFace](https://forum.techsoft3d.com/t/how-to-using-sc-triangulateface/1345): > > TriangulateFace takes several arguments (cf. [SC::Store::Utils::TriangulateFace](https://docs.techsoft3d.com/communicator/latest/api_ref/data_import/libsc/namespaceSC_1_1Store_1_1Utils.html#_CPPv4N2SC5Store5Utils15TriangulateFaceEPKN2SC5Store5PointEPKi6size_tRKN2SC5Store5PointERNSt6vectorIN2SC5Store5PointEEE)) to triangulate a supplied polygonal face. While most arguments are straightforward, the face\_list is a little more complicated. The first number in the face list array indicates the number of indices defining a face. This is followed by those indices (in the points array). This pattern repeats for subsequent faces. If you have two triangles, the face list array might be as follows; { 3, 0, 1, 2, 3, 2, 3, 0 } … does that mean if I want to create a surface with hole, I should triangulate the face by calling [SC::Store::Utils::TriangulateFace](https://docs.techsoft3d.com/communicator/latest/api_ref/data_import/libsc/namespaceSC_1_1Store_1_1Utils.html#_CPPv4N2SC5Store5Utils15TriangulateFaceEPKN2SC5Store5PointEPKi6size_tRKN2SC5Store5PointERNSt6vectorIN2SC5Store5PointEEE) first. --- _[View the full topic](https://forum.techsoft3d.com/t/how-to-describe-a-surface-with-an-inner-hole/4383)._