changing back face to front face in vertex shader

hi everyone,

i’m a beginner in glsl.
i’m searching for a way to make the back faces into front faces in the vertex shader. i’ve googled it but didn’t find what i was looking for.
i am thankful for any kind of help!

There’s no way to do this. Particularly since a vertex shader operates on vertices, not triangles.

Even a geometry shader doesn’t get to set the facing of a triangle.