@beniboy said: You have to use each vertex twice. It looks like right now your indices array is something like this: {1,2,3,4,5,6,7,8,9,10,1} While it should contain each index twice, like this: {1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,1}I hope you understand what I mean.
Sorry i missunderstand you. Can you just put some code with fixes?