Creating 'custom' shapes in open GL ?

Jonathan's icon

Hi, I'm looking into the openGL wish objects for jitter (jit.gl.gridshape, jit.gl.handle etc)

I'm wondering if there is any way to make your own shapes, say an arrow or a five point star.

I've found scarce mention of it online so I'm curious if it's even possible. Would I need to get openGL and somehow link it to max?